WRT clockwise, you could refer to the old left-hand or right-hand rule
from physics and chemistry.?
Clockwise????????????? = direction of curled fingers of left-hand when
thumb is pointing up.
Counter-clockwise = direction of curled fingers of right-hand when thumb
is pointing up.
J.
On 8/3/18 11:56, Kenneth Kehoe wrote:
> Thanks Jim. This is a good bit of work. I initially tried to come up
> with a system to define positive but ran into issues with roll because
> I needed more than one word. For example I was using "starboard up" to
> indicate what part of the platform is moving "up". But I think you
> have a better method by using a rotation word not a linear direction
> word for rotational movement. I would prefer to expand the attribute
> "positive" to recycle terms instead of making a new one. Also that
> term is fairly self explanatory. But if we don't want to mess with
> COARDS I understand. Maybe use "positive_direction". I like the idea
> for linear movement with surge, sway and heave but I think we need to
> stick with the clockwise category of "the direction of positive
> values". In that case the better term for surge, sway and heave would
> be "forward" or "backward". Overall I feel like using this new
> attribute will reduce the confusion greatly for I would also use it
> with radial instrument data with "toward" or "away". Pulling the
> direction of positive out of standard_name as Nan suggest should make
> definitions easier to agree on and work with historical data that was
> not assuming a positive direction of travel. If we do pull direction
> of travel out we will need to decide which one overrides the other
> when both are used. My preference is to let the new attribute override
> the direction of positive in the standard_name since the positive
> direction definition would be in the file while the standard name
> requires looking up.
>
> Now the 800 lb gorilla in the room... How to explain what we mean by
> clockwise, forward, toward. I feel like we keep stating that a "Google
> image search shows" so maybe we should look into a picture to solve
> our issue. The old idiom a picture is worth a thousand words
> <https://en.wikipedia.org/wiki/A_picture_is_worth_a_thousand_words>
> may be more true with this than ever. Plus it should help with English
> as a second language speaking users. Could CF host some images that
> would be tied to standard names so we can reference them when we need
> to describe the reference frame. Cf/Radial
> <http://www.ral.ucar.edu/projects/titan/docs/radial_formats/CfRadialDoc.pdf>
> uses a picture to describe the reference frame for aircraft in its
> document. Once the reference frame is well described the terms x-axis
> and clockwise are obvious. Using this example
> <https://www.grc.nasa.gov/WWW/K-12/rocket/Images/rotations.gif> is
> there any confusion on the positive direction for roll, pitch, yaw
> (ignore the actual positive direction, I'm just asking about the
> clarity of the image to convey direction of positive travel)?
>
> Have a wonderful weekend,
>
> Ken
>
>
>
> On 2018-8-3 08:41, Jim Biard wrote:
>>
>> I freely admit that I picked direction on sway arbitrarily. In my
>> experience, part of the variation that arises in the definitions of
>> the different motions arises from different thoughts about their use,
>> particularly whether someone is thinking the values are used to
>> transform into the platform body frame vs transform from it. Or maybe
>> they just aren't worrying about consistency. Like as not, choices
>> have often been made in attempts to make the values have the
>> signed-ness that felt right to people, and we can't keep to
>> conventions like the right hand rule and make it all work
>> consistently. We want a positive pitch to be nose up. We want a
>> positive yaw to be nose right. We want positive heave to be up. My
>> natural tendency is to think of "roll right" as positive and "sway
>> right" as positive, but that isn't what other people think of.
>>
>> As I read what I wrote, I realize I didn't use a consistent approach
>> to position and look direction when assigning clockwise and
>> anticlockwise to roll, pitch, and yaw. I need to regularize that.
>>
>> Reading the Conventions about vertical coordinates, it says they must
>> all have a "positive" attribute with a value of "up" or "down". I
>> don't see a problem with having the definitions back off of declaring
>> a specific directionality and add an attribute declaring
>> directionality. We could call the attribute "direction" so as not to
>> step on the "positive" attribute, and say that if the attribute is
>> not present that the user should not assume which direction is correct.
>>
>> If we declare that X is positive forward, that Y is positive left,
>> that Z is positive up, and that we use the right-hand rule for angle
>> directions, the direction attribute values could be:
>>
>> * roll: "clockwise" for positive right side up and "anticlockwise"
>> for positive right side down.
>> * pitch: "clockwise" for positive nose up and "anticlockwise" for
>> positive nose down.
>> * yaw: "clockwise" for positive nose right and "anticlockwise" for
>> positive nose left.
>> * surge: "positive" for positive forward and "negative" for
>> positive backward.
>> * sway: "positive" for positive left and "negative" for positive right.
>> * heave: "positive" for positive up and "negative" for positive down.
>>
>> Thoughts?
>>
>> BTW, I'll be out until August 13.
>>
>> Grace and peace,
>>
>> Jim
>>
>> On 8/2/18 12:58 PM, Kenneth Kehoe wrote:
>>> Thanks Nan and Roy for the positive direction information. I did the
>>> Google search as Roy suggested and I found more images with Jim's
>>> definition of positive with starboard down, but there are enough
>>> with starboard up to think it's not a standard. This does point out
>>> my main concern with putting positive direction in the standard
>>> name. Would we then need to create a new standard name with the only
>>> difference being the positive direction? I'm OK with doing this but
>>> I worry about the increase of names. I think this needs to be a
>>> different discussion, but putting the positive direction in an
>>> attribute makes the most logical sense to me. I did take a stab at
>>> trying to define a standard at this and it was not great.
>>>
>>> So at this time I'm proposing that if we define roll, sway we need
>>> to define them twice to get both positive directions defined and
>>> available for use. I don't think CF should force a convention on the
>>> data, the user should be free to represent the data as it is
>>> produced by the instrument.
>>>
>>> FYI a very quick search of the data products we produce:
>>>
>>> * pitch with nose up positive: 6
>>> * roll with right side down positive: 6
>>> * yaw with clockwise positive: 1
>>> * sway with toward left side positive: 1
>>> * surge with toward bow positive: 1
>>> * heave with up positive: 1
>>>
>>>
>>> Ken
>>>
>>>
>>>
>>> On 2018-8-2 09:29, Nan Galbraith wrote:
>>>> Thank you, Jim, well done.
>>>>
>>>> My only concern is that platform_orientation is describing the same
>>>> angle
>>>> as yaw, and maybe should be deprecated.? The web is full of
>>>> references to
>>>> 'platform orientation', and a very quick check tells me they
>>>> (mainly) refer to
>>>> all 3 axes.
>>>>
>>>> I tried to check the sign of roll for ADCPs, since this is a
>>>> variable that's output
>>>> by the Teledyne-RDIs that we use, but I don't have the time to do a
>>>> thorough job
>>>> at this point. If different communities define this differently,
>>>> Maybe we'll need to
>>>> consider using an attribute.
>>>>
>>>> Cheers - Nan
>>>>
>>>> On 8/2/18 5:01 AM, Lowry, Roy K. wrote:
>>>>>
>>>>> Dear All,
>>>>>
>>>>>
>>>>> You're not going to believe this, but try Googling 'pitch roll
>>>>> yaw' and look through the images at the?roll sign convention. This
>>>>> reveals some inconsistency on whether?positive roll is clockwise
>>>>> when looking forward (Jim's definition)?or looking backward (Ken's
>>>>> definition).
>>>>>
>>>>>
>>>>> My personal experience from going to sea was that positive roll
>>>>> was port to?starboard?- i.e. clockwise when looking forward. I'm
>>>>> pretty sure the roll data?streams we handle (Autosub and gliders)
>>>>> also?conform to this convention, but will ask somebody to check.
>>>>>
>>>>>
>>>>> Could I suggest that Ken also?check his definition sources and
>>>>> data streams.
>>>>>
>>>>>
>>>>> Cheers, Roy.
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------
>>>>>
>>>>> *From:* CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf
>>>>> of Kenneth Kehoe <kkehoe at ou.edu>
>>>>> *Sent:* 01 August 2018 22:51
>>>>> *To:* cf-metadata at cgd.ucar.edu
>>>>> *Subject:* Re: [CF-metadata] Platform Heave
>>>>> Sounds good to me except the platform_roll positive direction
>>>>> seems to be opposite of what we have been describing. I typically
>>>>> have platform roll positive for right-hand side rising.
>>>>>
>>>>> Ken
>>>>>
>>>>>
>>>>> On 2018-8-1 13:55, Jim Biard wrote:
>>>>>>
>>>>>> Hi.
>>>>>>
>>>>>>
>>>>>> Here is my proposal for a self-consistent and generic set of
>>>>>> definitions for roll, pitch, yaw, surge, sway, heave, course, and
>>>>>> orientation. I've tried to avoid lots of reference frame or
>>>>>> vector terms, basing everything on the vertical direction and the
>>>>>> nominal forward motion direction, which are two things all the
>>>>>> moving platforms we are concerned with have, and which I think
>>>>>> are easy enough to extrapolate to a stationary platform. I
>>>>>> haven't bothered to do the *_rate definitions, since they are
>>>>>> simple extrapolations of these definitions.
>>>>>>
>>>>>> I have taken the liberty of removing the redundant word "angle"
>>>>>> from the definitions of roll, pitch, and yaw. It is like using
>>>>>> "latitude angle" for latitude or "course angle" for course. We
>>>>>> can make the redundant formulations aliases of the proper ones.
>>>>>>
>>>>>>
>>>>>>
>>>>>> *
>>>>>>
>>>>>> platform_roll: Roll is a rotation about an axis (the X axis) that
>>>>>> is perpendicular to the local vertical axis (the Z axis) and is
>>>>>> coplanar with the nominal forward motion direction for the
>>>>>> platform. The rotation is positive clockwise about that axis when
>>>>>> seen from behind the platform looking towards it (e.g. right-hand
>>>>>> side falling), and relative to the ?at rest? rotation of the
>>>>>> platform with respect to the X axis. Platform is a structure or
>>>>>> vehicle that serves as a base for mounting sensors. Platforms
>>>>>> include, but are not limited to, satellites, aeroplanes, ships,
>>>>>> buoys, ground stations, and masts.
>>>>>>
>>>>>> **
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> platform_pitch: Pitch is a rotation about an axis (the Y axis)
>>>>>> that is perpendicular to both the local vertical axis (the Z
>>>>>> axis) and the nominal forward motion direction for the platform.
>>>>>> The rotation is positive clockwise about that axis when seen from
>>>>>> the left of the platform looking towards it (e.g. front end
>>>>>> rising), and relative to the ?at rest? rotation of the platform
>>>>>> with respect to the Y axis. Platform is a structure or vehicle
>>>>>> that serves as a base for mounting sensors. Platforms include,
>>>>>> but are not limited to, satellites, aeroplanes, ships, buoys,
>>>>>> ground stations, and masts.
>>>>>>
>>>>>> **
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> platform_yaw: Yaw is a rotation about the local vertical axis
>>>>>> (the Z axis). The rotation is positive clockwise about that axis
>>>>>> when seen from above the platform looking towards it (e.g. front
>>>>>> end turning to the right), and relative to the ?at rest? rotation
>>>>>> of the platform with respect to the Z axis. Platform is a
>>>>>> structure or vehicle that serves as a base for mounting sensors.
>>>>>> Platforms include, but are not limited to, satellites,
>>>>>> aeroplanes, ships, buoys, ground stations, and masts.
>>>>>>
>>>>>> **
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> platform_surge: Surge is a displacement along an axis (the X
>>>>>> axis) that is perpendicular to the local vertical axis (the Z
>>>>>> axis) and is coplanar with the nominal forward motion direction
>>>>>> for the platform. The displacement is positive for motion of the
>>>>>> platform in the nominal forward motion direction (e.g. forward
>>>>>> motion), and relative to the ?at rest? position of the platform
>>>>>> with respect to the X axis. The ?at rest? position of the
>>>>>> platform may change over time. Platform is a structure or vehicle
>>>>>> that serves as a base for mounting sensors. Platforms include,
>>>>>> but are not limited to, satellites, aeroplanes, ships, buoys,
>>>>>> ground stations, and masts.
>>>>>>
>>>>>> **
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> platform_sway: Sway is a displacement along an axis (the Y axis)
>>>>>> that is perpendicular to both the local vertical axis (the Z
>>>>>> axis) and the nominal forward motion direction for the platform.
>>>>>> The displacement is positive for motion of the platform to the
>>>>>> right of the nominal forward motion direction when seen from
>>>>>> behind the platform looking towards it (e.g. rightward motion),
>>>>>> and relative to the ?at rest? position of the platform with
>>>>>> respect to the Y axis. The ?at rest? position of the platform may
>>>>>> change over time. Platform is a structure or vehicle that serves
>>>>>> as a base for mounting sensors. Platforms include, but are not
>>>>>> limited to, satellites, aeroplanes, ships, buoys, ground
>>>>>> stations, and masts.
>>>>>>
>>>>>> **
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> platform_heave: Heave is a displacement along the local vertical
>>>>>> axis (the Z axis). The displacement is positive for upward motion
>>>>>> of the platform, and relative to the ?at rest? position of the
>>>>>> platform with respect to the Z axis. The ?at rest? position of
>>>>>> the platform may change over time. Platform is a structure or
>>>>>> vehicle that serves as a base for mounting sensors. Platforms
>>>>>> include, but are not limited to, satellites, aeroplanes, ships,
>>>>>> buoys, ground stations, and masts.
>>>>>>
>>>>>> **
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> platform_course: Course is the clockwise angle with respect to
>>>>>> North of the nominal forward motion direction of the platform.
>>>>>> Platform is a structure or vehicle that serves as a base for
>>>>>> mounting sensors. Platforms include, but are not limited to,
>>>>>> satellites, aeroplanes, ships, buoys, ground stations, and masts.
>>>>>>
>>>>>> **
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> platform_orientation: Orientation is the clockwise angle with
>>>>>> respect to North of the longitudinal (front-to-back) axis of the
>>>>>> platform, which may be different than the platform course (see
>>>>>> platform_course).*Platforms include, but are not limited to,
>>>>>> satellites, aeroplanes, ships, buoys, ground stations, and masts.*
>>>>>>
>>>>>> *
>>>>>> Grace and peace,
>>>>>>
>>>>>> Jim
>>>>>>
>>>>>> On 7/31/18 3:29 AM, Lowry, Roy K. wrote:
>>>>>>>
>>>>>>> On second thoughts removing the underscores is more elegant
>>>>>>> correction than adding 'platform'.
>>>>>>>
>>>>>>>
>>>>>>> Cheers, Roy.
>>>>>>>
>>>>>>>
>>>>>>> I have now retired but will continue to be active through an
>>>>>>> Emeritus Fellowship using this e-mail address.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>>
>>>>>>> *From:* CF-metadata <cf-metadata-bounces at cgd.ucar.edu>
>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu> on behalf of Lowry,
>>>>>>> Roy K. <rkl at bodc.ac.uk> <mailto:rkl at bodc.ac.uk>
>>>>>>> *Sent:* 30 July 2018 18:49
>>>>>>> *To:* Kenneth Kehoe
>>>>>>> *Cc:* CF Metadata List
>>>>>>> *Subject:* Re: [CF-metadata] Platform Heave
>>>>>>>
>>>>>>> Hi Ken,
>>>>>>>
>>>>>>>
>>>>>>> You're absolutely right - should have been platform_yaw_angle.
>>>>>>> Getting the detail spot on in these things isn't easy, which is
>>>>>>> why we have discussion lists!
>>>>>>>
>>>>>>>
>>>>>>> With the way I'm currently seeing things?I don't agree that
>>>>>>> pitch and roll affect the definition of heave. They are only
>>>>>>> factors that come into account with the coupling of heave into
>>>>>>> the next level of the CRS hierarchy.
>>>>>>>
>>>>>>>
>>>>>>> Cheers, Roy.
>>>>>>>
>>>>>>>
>>>>>>> I have now retired but will continue to be active through an
>>>>>>> Emeritus Fellowship using this e-mail address.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>>
>>>>>>> *From:* CF-metadata <cf-metadata-bounces at cgd.ucar.edu>
>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu> on behalf of Kenneth
>>>>>>> Kehoe <kkehoe at ou.edu> <mailto:kkehoe at ou.edu>
>>>>>>> *Sent:* 30 July 2018 18:39
>>>>>>> *Cc:* CF Metadata List
>>>>>>> *Subject:* Re: [CF-metadata] Platform Heave
>>>>>>> I agree with John the (keel to top of mast) statement is
>>>>>>> incorrect when the platform is tilted. I only inserted that to
>>>>>>> help describe the Z-axis. But I don't think it's helping. I
>>>>>>> think John is also right on point with this since I can't find a
>>>>>>> definition of heave that discusses the orientation of the
>>>>>>> platform and how it relates to the measurement of heave. That is
>>>>>>> why I'm suggesting we not try to tackle that issue. From an
>>>>>>> instrument perspective I don't think the organization writing
>>>>>>> the measurement to file actually know all the details of how the
>>>>>>> values are derived or the full reference frame. I tell people to
>>>>>>> not use the standard_name definitions unless they are positive
>>>>>>> it matches exactly, and without all the information I don't
>>>>>>> think people will be able to use a too specific definition. A
>>>>>>> less specific definition would allow the use now, and a more
>>>>>>> specific definition can be added later if needed.
>>>>>>>
>>>>>>> I did like Roy's definition of platform_yaw_angle and
>>>>>>> platform_yaw_rate. My only suggestion is to remove the
>>>>>>> underscore in "yaw_angle" in the definition of
>>>>>>> platform_yaw_rate, or use the full term "platform_yaw_angle".
>>>>>>> Otherwise it appears like a reference to a different term.
>>>>>>>
>>>>>>> Ken
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 2018-7-30 10:52, John Graybeal wrote:
>>>>>>>> 1) Now that we have another platform_heave comment, could we
>>>>>>>> please create a new thread for the discussion on
>>>>>>>> pitch/roll/heading? ?Maybe starting without all the historical
>>>>>>>> points, at least the heave-related ones? Both are difficult
>>>>>>>> conversations to follow in sequence.
>>>>>>>>
>>>>>>>> 2) I have a concern about the last two heave definitions.
>>>>>>>> ? a) "Heave is the linear motion along the vertical Z-axis
>>>>>>>> (e.g. keel to top of mast) with positive values representing
>>>>>>>> upward motion.?
>>>>>>>>
>>>>>>>> I like the thrust of this definition, it?s simple to
>>>>>>>> understand. However I don?t think it?s measured in the
>>>>>>>> direction of keel to top of mast of the current or recent
>>>>>>>> vessel position, is it? I rather assume it is perpendicular to
>>>>>>>> a nominally level service, possibly in the direction of the
>>>>>>>> gravity vector. The dictionary definition "Heaving is the
>>>>>>>> linear motion along the vertical Z-axis? with the positive
>>>>>>>> values coda seems closer.
>>>>>>>>
>>>>>>>> ? b) "upwards vertical displacement of a platform over a
>>>>>>>> measurement time interval?
>>>>>>>>
>>>>>>>> I can?t tell how to parse ?over? here. ?An upwards vertical
>>>>>>>> displacement is relative to another position, and in this case
>>>>>>>> I think that ?original? position is being measured (at least
>>>>>>>> conceptually) during another time interval. It just needs a few
>>>>>>>> words, something like ?of a platform when compared to its
>>>>>>>> average vertical position over a corresponding time interface?.
>>>>>>>>
>>>>>>>> But I guess the fundamental issue is I can?t tell (and don?t
>>>>>>>> actually know) what heave is determined with respect to. If my
>>>>>>>> last 11 positions relative to average seas are 0, 1, 2, 2, 1,
>>>>>>>> 4, 1, 2, 2, 1, 0 (think hilly!), I have no idea if the heave at
>>>>>>>> the peak (?4?) is 4 or something else ? it just depends on when
>>>>>>>> and how long the baseline measurement is, doesn?t it? ?(Or to
>>>>>>>> put it another way, is the heave at the 7th point a negative
>>>>>>>> number, since the ship just went down 3 units?) ?If someone can
>>>>>>>> answer that then our best definition might be more obvious.
>>>>>>>>
>>>>>>>> John
>>>>>>>>
>>>>>>>> ---------------------------------------
>>>>>>>> John Graybeal
>>>>>>>> jbgraybeal at mindspring.com <mailto:jbgraybeal at mindspring.com>
>>>>>>>>
>>>>>>>>> On Jul 29, 2018, at 04:29, Lowry, Roy K. <rkl at bodc.ac.uk
>>>>>>>>> <mailto:rkl at bodc.ac.uk>> wrote:
>>>>>>>>>
>>>>>>>>> Dear All,
>>>>>>>>>
>>>>>>>>> Giving it some thought over the weekend I realise that where
>>>>>>>>> we lost the plot in this discussion was when we encountered
>>>>>>>>> 'direction of travel'. Jim succinctly described platform
>>>>>>>>> motion with the phrase 'nested co-ordinate systems'. What I
>>>>>>>>> failed to realise - and I'm guessing I'm not alone - is that
>>>>>>>>> the pitch, roll, heave etc. family of terms for platform
>>>>>>>>> motion refer SOLELY to the innermost co-ordinate reference in
>>>>>>>>> that nest and that the 'zero' for these measurements is
>>>>>>>>> 'platform at rest'. This innermost co-ordinate reference
>>>>>>>>> comprises three orthogonal axes that intersect at the
>>>>>>>>> platform's centre of gravity. Two of these are horizontal
>>>>>>>>> (Ken's longitudinal X-axis and transverse Y-axis) and the
>>>>>>>>> third vertical (Ken's vertical Z-axis). Others make?no attempt
>>>>>>>>> to treat these parameters in the same way as zenith, and I now
>>>>>>>>> realise?CF shouldn't be any different.
>>>>>>>>>
>>>>>>>>> Having come to terms with this, Ken's definition elements hve
>>>>>>>>> a beautiful simplicity that?can be slotted into Alison's
>>>>>>>>> compound definitions. My only problem is the inclusion of
>>>>>>>>> nautical terms like 'bow' and 'stern', but these can easily be
>>>>>>>>> replaced by generic equivalents such as 'front' and 'back'. I
>>>>>>>>> would also make it clearer is that zero is platform at rest.
>>>>>>>>>
>>>>>>>>> For example the definition pair for yaw become:
>>>>>>>>>
>>>>>>>>> platform_yaw_angle
>>>>>>>>> "yaw _angle"?is the amount of rotation from the rest
>>>>>>>>> position?around the vertical Z-axis with positive values
>>>>>>>>> resulting in clockwise motion?when viewed from above.?The
>>>>>>>>> vertical?Z axis, also known as the "yaw axis", is an imaginary
>>>>>>>>> line running vertically through the platform's?centre of
>>>>>>>>> gravity. Standard names for "platform" describe the motion and
>>>>>>>>> orientation of the vehicle from which observations are made.
>>>>>>>>> Platforms include, but are not limited to, satellites,
>>>>>>>>> aeroplanes, ships, instruments and buoys.
>>>>>>>>>
>>>>>>>>> platform_yaw_rate
>>>>>>>>> "platform_yaw_rate" is the change per unit time of
>>>>>>>>> "yaw_angle". "yaw _angle"?is?the amount of rotation from the
>>>>>>>>> rest position?around the vertical Z-axis with positive values
>>>>>>>>> resulting in clockwise motion?when viewed from above.?The
>>>>>>>>> vertical Z axis, also known as the "yaw axis", is an imaginary
>>>>>>>>> line running vertically through the platform's centre of
>>>>>>>>> gravity. Standard names for "platform" describe the motion and
>>>>>>>>> orientation of the vehicle from which observations are made.
>>>>>>>>> Platforms include, but are not limited to, satellites,
>>>>>>>>> aeroplanes, ships, instruments and buoys.
>>>>>>>>>
>>>>>>>>> How does that work for people?
>>>>>>>>>
>>>>>>>>> Cheers, Roy.
>>>>>>>>>
>>>>>>>>> I have now retired but will continue to be active through an
>>>>>>>>> Emeritus Fellowship using this e-mail address.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ------------------------------------------------------------------------
>>>>>>>>>
>>>>>>>>> *From:*CF-metadata <cf-metadata-bounces at cgd.ucar.edu
>>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>> on behalf of
>>>>>>>>> Kenneth Kehoe <kkehoe at ou.edu <mailto:kkehoe at ou.edu>>
>>>>>>>>> *Sent:*27 July 2018 16:49
>>>>>>>>> *To:*cf-metadata at cgd.ucar.edu <mailto:cf-metadata at cgd.ucar.edu>
>>>>>>>>> *Subject:*Re: [CF-metadata] Platform Heave
>>>>>>>>> All,
>>>>>>>>>
>>>>>>>>> Sorry for joining this conversation late. This is an important
>>>>>>>>> discussion for my group and finding a resolution would be very
>>>>>>>>> helpful. For my purposes I only need a good definition, which
>>>>>>>>> might coincide with the nautical definitions. For examplethis
>>>>>>>>> reference
>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.wartsila.com_encyclopedia_term_ship-2Dmotions&d=DwMFaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=J2x5E3dUpn954rPN8-v-TFQOZiyobvfd2MaoRgJ8_Zg&s=GnqNqW163_p5PcNhTjRgd0qwnu6cR6JuDeQvE2qaBGQ&e=>would
>>>>>>>>> suffice for most of my needs except for the missing definition
>>>>>>>>> of positive direction. I've asked about defining a positive
>>>>>>>>> direction in the past using the "positive" attribute and it
>>>>>>>>> was decided to not expand that attribute. If we can define the
>>>>>>>>> positive direction in all the platform standard names that
>>>>>>>>> would be great, but it should be universally existent for all
>>>>>>>>> current and future platform definitions.
>>>>>>>>>
>>>>>>>>> I would prefer to not get into the details of how a value is
>>>>>>>>> derived in the definition as that is more of the cell_methods
>>>>>>>>> domain. Also I find that confusing as heave on an ocean going
>>>>>>>>> ship is not always measured as the difference between two GPS
>>>>>>>>> points but could be an integration of a speed or acceleration.
>>>>>>>>> This would result in two different measurements that depend on
>>>>>>>>> the method, but both are correct.
>>>>>>>>>
>>>>>>>>> I next attempted to come up with some definitions but I ended
>>>>>>>>> up going down a wormhole of different reference frames only to
>>>>>>>>> realize in the end my definitions will never match with the
>>>>>>>>> values from the vendor supplied data values because my
>>>>>>>>> definitions were becoming too specific. I can't find a
>>>>>>>>> definition of heave that takes into account tides, large waves
>>>>>>>>> (water or atmospheric), or orientation of the platform. They
>>>>>>>>> all seem to be relative to the platform position some x time
>>>>>>>>> ago. So here is my attempt at the definitions:
>>>>>>>>>
>>>>>>>>> platform_heave =? Heave is the linear motion along the
>>>>>>>>> vertical Z-axis (e.g. keel to top of mast) with positive
>>>>>>>>> values representing upward motion.
>>>>>>>>>
>>>>>>>>> platform_sway = Sway is the motion along the transverse Y-axis
>>>>>>>>> (e.g. port to starboard) with positive values towards the
>>>>>>>>> right-hand side the platform (starboard) when oriented towards
>>>>>>>>> leading edge of the platform.
>>>>>>>>>
>>>>>>>>> platform_surge = Surge is the motion along the longitudinal
>>>>>>>>> X-axis (e.g. stern to bow) with positive values indicating
>>>>>>>>> motion towards the leading edge of the platform (bow).
>>>>>>>>>
>>>>>>>>> platform_roll_angle = Roll is a rotation around a longitudinal
>>>>>>>>> X-axis with positive values resulting in counter clockwise
>>>>>>>>> motion (e.g. right-hand side rising) when oriented towards
>>>>>>>>> leading edge of the platform.
>>>>>>>>>
>>>>>>>>> platform_pitch_angle = Pitch is a rotation around the
>>>>>>>>> transverse Y-axis with positive values resulting in counter
>>>>>>>>> clockwise motion (e.g. leading edge of the platform rising).
>>>>>>>>>
>>>>>>>>> platform_yaw_angle = Yaw is a rotation around the vertical
>>>>>>>>> Z-axis with positive values resulting in clockwise motion of
>>>>>>>>> the forward section (bow) when viewed from above.
>>>>>>>>>
>>>>>>>>> platform_roll_rate = Roll rate is rotation change per unit
>>>>>>>>> time around a longitudinal X-axis with positive values
>>>>>>>>> resulting in counter clockwise motion (e.g. right-hand side
>>>>>>>>> rising) when oriented towards leading edge of the platform.
>>>>>>>>>
>>>>>>>>> platform_pitch_rate = Pitch rate is rotation change per unit
>>>>>>>>> time around the transverse Y-axis with positive values
>>>>>>>>> resulting in counter clockwise motion (e.g. leading edge of
>>>>>>>>> the platform rising).
>>>>>>>>>
>>>>>>>>> platform_yaw_rate = Yaw rate is rotation change per unit time
>>>>>>>>> around the vertical Z-axis with positive values resulting in
>>>>>>>>> clockwise motion of the forward section (bow) when viewed from
>>>>>>>>> above.
>>>>>>>>>
>>>>>>>>> I know these differ from the current definitions, but I'm not
>>>>>>>>> completely understanding how the definitions are created. Is
>>>>>>>>> platform_orientation always prepended? Is a rate always
>>>>>>>>> defined with the same as the angle definition but with a final
>>>>>>>>> sentence explaining it's actually a rate?
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>>
>>>>>>>>> Ken
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 2018-7-25 09:50, Jim Biard wrote:
>>>>>>>>>> Alison,
>>>>>>>>>> It's a lovely nested reference frames problem, isn't it?
>>>>>>>>>> Roll, pitch, and yaw are usually defined relative to a center
>>>>>>>>>> of motion (CM) reference frame defined using the (mean)
>>>>>>>>>> direction of motion and the up direction. In my
>>>>>>>>>> (satellite-based) experience, the Y axis unit vector is
>>>>>>>>>> defined by the normalized cross-product of the up unit vector
>>>>>>>>>> with the direction of motion unit vector (Z x X). The X axis
>>>>>>>>>> unit vector is then defined by the cross-product of the Y
>>>>>>>>>> unit vector and the up unit vector (Y x Z). This means of
>>>>>>>>>> forming the CM reference frame decouples orientation from
>>>>>>>>>> motion. The X axis is not necessarily identical to the
>>>>>>>>>> direction of motion. The vehicle reference frame may have
>>>>>>>>>> fixed offsets in x, y, z, roll, pitch, and yaw relative to
>>>>>>>>>> the CM reference frame, but in my limited experience those
>>>>>>>>>> offsets have been zero.
>>>>>>>>>> Platforms that aren't moving are an even more entertaining
>>>>>>>>>> case, for sure!
>>>>>>>>>> In the end, I'd tend towards referring to a CM or geospatial
>>>>>>>>>> reference frame with the Z direction defined as "up" if I'm
>>>>>>>>>> going to try and get detailed about it, as opposed to 'mean
>>>>>>>>>> orientation'. But I only have experience with satellites (and
>>>>>>>>>> a bit with airplanes).
>>>>>>>>>> Grace and peace,
>>>>>>>>>> Jim
>>>>>>>>>>
>>>>>>>>>> On 7/25/18 9:37 AM, Alison Pamment - UKRI STFC wrote:
>>>>>>>>>>> Hi Roy and Jim,
>>>>>>>>>>>
>>>>>>>>>>> Thanks for your quick comments on the definitions. I have
>>>>>>>>>>> just been looking again at the suggested text for yaw_angle:
>>>>>>>>>>> 'Platform yaw angle is the angle between the platform's
>>>>>>>>>>> longitudinal/X axis and the direction of travel. Zero yaw
>>>>>>>>>>> angle means the longitudinal axis is aligned with the
>>>>>>>>>>> direction of travel, or a reference direction if the
>>>>>>>>>>> platform is stationary. The usual sign convention is that
>>>>>>>>>>> yaw angle is measured positive when the front or leading
>>>>>>>>>>> edge of the platform is rotated clockwise from its
>>>>>>>>>>> orientation (which has the standard name
>>>>>>>>>>> platform_orientation).'
>>>>>>>>>>>
>>>>>>>>>>> The problem is how to describe the reference direction which
>>>>>>>>>>> the angle is calculated relative to. I started out by
>>>>>>>>>>> talking about 'direction of travel' and later referred to
>>>>>>>>>>> 'platform_orientation'. The definition of
>>>>>>>>>>> platform_orientation says 'The platform orientation is the
>>>>>>>>>>> direction in which the "front" or longitudinal axis of the
>>>>>>>>>>> platform is pointing (not necessarily the same as the
>>>>>>>>>>> direction in which it is travelling, called
>>>>>>>>>>> platform_course).' I've realised my new definition doesn't
>>>>>>>>>>> really make sense if direction of travel and orientation
>>>>>>>>>>> aren't the same (and clearly they can be different). Also,
>>>>>>>>>>> if 'orientation' is the instantaneous direction of the
>>>>>>>>>>> longitudinal axis, then presumably it includes yaw angle, so
>>>>>>>>>>> it isn't the right reference for measuring yaw.
>>>>>>>>>>>
>>>>>>>>>>> I've revised the text as follows:
>>>>>>>>>>> 'Platform yaw angle is the angle between the platform's
>>>>>>>>>>> longitudinal/X axis and the platform's mean orientation
>>>>>>>>>>> (i.e. its orientation not including high frequency
>>>>>>>>>>> variations due to swaying and rocking motions, for example,
>>>>>>>>>>> ship motions caused by the passing of sea surface waves).
>>>>>>>>>>> Zero yaw angle means the longitudinal axis is aligned with
>>>>>>>>>>> the mean orientation. The usual sign convention is that yaw
>>>>>>>>>>> angle is measured positive when the front or leading edge of
>>>>>>>>>>> the platform is rotated clockwise from its mean orientation
>>>>>>>>>>> (which has the standard name platform_orientation).
>>>>>>>>>>>
>>>>>>>>>>> Does it sound okay to refer to a 'mean orientation' in this
>>>>>>>>>>> way? I'm having trouble thinking of a better wording!
>>>>>>>>>>>
>>>>>>>>>>> Best wishes,
>>>>>>>>>>> Alison
>>>>>>>>>>>
>>>>>>>>>>> ------
>>>>>>>>>>> Alison Pamment???????????????????????????????? Tel: +44 1235
>>>>>>>>>>> 778065
>>>>>>>>>>> NCAS/Centre for Environmental Data Archival???
>>>>>>>>>>> Email:alison.pamment at stfc.ac.uk
>>>>>>>>>>> <mailto:alison.pamment at stfc.ac.uk>
>>>>>>>>>>> STFC Rutherford Appleton Laboratory
>>>>>>>>>>> R25, 2.22
>>>>>>>>>>> Harwell Oxford, Didcot, OX11 0QX, U.K.
>>>>>>>>>>>
>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>> From: CF-metadata<cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>? On Behalf Of
>>>>>>>>>>> Alison Pamment - UKRI STFC
>>>>>>>>>>> Sent: 25 July 2018 13:12
>>>>>>>>>>> To: Hamilton, Steve<sj.hamilton at fugro.com>
>>>>>>>>>>> <mailto:sj.hamilton at fugro.com>;cf-metadata at cgd.ucar.edu
>>>>>>>>>>> <mailto:cf-metadata at cgd.ucar.edu>
>>>>>>>>>>> Subject: Re: [CF-metadata] Platform Heave
>>>>>>>>>>>
>>>>>>>>>>> Dear Steve, Nan, et al,
>>>>>>>>>>>
>>>>>>>>>>> Thank you for proposing new standard names for
>>>>>>>>>>> platform_heave and improved definitions for existing names
>>>>>>>>>>> for platform pitch, roll and yaw. Thank you also to all
>>>>>>>>>>> those who submitted comments about these names.
>>>>>>>>>>>
>>>>>>>>>>> Regarding Steve's proposals for new names, the discussion
>>>>>>>>>>> seems to have reached consensus on the quantities themselves.
>>>>>>>>>>>
>>>>>>>>>>> Until now, our usual explanatory sentence for 'platform' has
>>>>>>>>>>> said 'Standard names for platform describe the motion and
>>>>>>>>>>> orientation of the vehicle from which observations are made
>>>>>>>>>>> e.g. aeroplane, ship or satellite.' Nan has suggested
>>>>>>>>>>> extending the list of possible platforms, which seems fair
>>>>>>>>>>> enough, so we would now have 'Standard names for platform
>>>>>>>>>>> describe the motion and orientation of the vehicle from
>>>>>>>>>>> which observations are made. Platforms include, but are not
>>>>>>>>>>> limited to, satellites, aeroplanes, ships, instruments, and
>>>>>>>>>>> buoys.' I've added this into the definitions of Steve's
>>>>>>>>>>> names, leading to:
>>>>>>>>>>>
>>>>>>>>>>> platform_heave (m)
>>>>>>>>>>> 'Standard names for "platform" describe the motion and
>>>>>>>>>>> orientation of the vehicle from which observations are made.
>>>>>>>>>>> Platforms include, but are not limited to, satellites,
>>>>>>>>>>> aeroplanes, ships, instruments, and buoys. "Heave" means the
>>>>>>>>>>> vertical displacement of a platform (positive upwards) over
>>>>>>>>>>> a measurement time interval.'
>>>>>>>>>>>
>>>>>>>>>>> platform_heave_rate (m s-1)
>>>>>>>>>>> 'Standard names for "platform" describe the motion and
>>>>>>>>>>> orientation of the vehicle from which observations are made.
>>>>>>>>>>> Platforms include, but are not limited to, satellites,
>>>>>>>>>>> aeroplanes, ships, instruments, and buoys "Heave" means the
>>>>>>>>>>> vertical displacement of a platform (positive upwards) over
>>>>>>>>>>> a measurement time interval. "Heave rate" means the rate of
>>>>>>>>>>> change of vertical displacement of the platform over a
>>>>>>>>>>> measurement time interval.'
>>>>>>>>>>>
>>>>>>>>>>> These two names are accepted for publication in the standard
>>>>>>>>>>> name table and will be added in the next update, planned for
>>>>>>>>>>> 6th August.
>>>>>>>>>>>
>>>>>>>>>>> We have six existing platform pitch, roll and yaw names:
>>>>>>>>>>> platform_pitch_angle (degree)
>>>>>>>>>>> platform_pitch_rate (degree s-1)
>>>>>>>>>>> platform_roll_angle (degree)
>>>>>>>>>>> platform_roll_rate (degree s-1)
>>>>>>>>>>> platform_yaw_angle (degree)
>>>>>>>>>>> platform_yaw_rate (degree s-1)
>>>>>>>>>>>
>>>>>>>>>>> Nan has suggested the following definitions, based
>>>>>>>>>>> onhttps://en.wikipedia.org/wiki/Ship_motions
>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Ship-5Fmotions&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=gxXkUfvVSqtWNEzxwyAeuKgEMzADzXWv2OOZtOBRAao&e=>.
>>>>>>>>>>> (A quick search of other online sources yields definitions
>>>>>>>>>>> consistent with these).
>>>>>>>>>>> Pitch
>>>>>>>>>>> The up/down rotation of a platform about its transverse/Y
>>>>>>>>>>> axis. The transverse/Y axis, lateral or pitch axis is an
>>>>>>>>>>> imaginary line running horizontally across the platform and
>>>>>>>>>>> through its center of gravity. A pitch? motion is an
>>>>>>>>>>> up-or-down movement of the bow and stern of the platform.
>>>>>>>>>>>
>>>>>>>>>>> Roll
>>>>>>>>>>> The tilting rotation of a platform about its longitudinal/X
>>>>>>>>>>> axis. The longitudinal/X axis, or roll axis, is an imaginary
>>>>>>>>>>> line running horizontally through the length of the
>>>>>>>>>>> platform, through its center of gravity, and parallel to the
>>>>>>>>>>> waterline. A roll motion is a side-to-side or port-starboard
>>>>>>>>>>> tilting motion of the superstructure around this axis.
>>>>>>>>>>>
>>>>>>>>>>> Yaw
>>>>>>>>>>> The turning rotation of a platform about its vertical/Z
>>>>>>>>>>> axis. The vertical/Z axis, or yaw axis, is an imaginary line
>>>>>>>>>>> running vertically through the platform and through its
>>>>>>>>>>> center of gravity. A yaw motion is a side-to side movement
>>>>>>>>>>> of the bow and stern of the ship.
>>>>>>>>>>>
>>>>>>>>>>> These are useful and concise definitions. I suggest that we
>>>>>>>>>>> don't refer anywhere to 'ship', 'bow' or 'stern', since we
>>>>>>>>>>> want the definitions to apply to all possible platforms. I'm
>>>>>>>>>>> thinking also that 'port' and 'starboard' may apply to ships
>>>>>>>>>>> and aeroplanes, but perhaps not to a satellite, so are
>>>>>>>>>>> probably best avoided. Similarly, 'waterline' only applies
>>>>>>>>>>> to maritime platforms. I suggest the following amendments to
>>>>>>>>>>> make the definitions as generic as possible:
>>>>>>>>>>>
>>>>>>>>>>> Pitch
>>>>>>>>>>> "Pitch" means rotation of the platform in the vertical plane
>>>>>>>>>>> about its transverse/Y axis. The transverse/Y axis, also
>>>>>>>>>>> known as the "lateral axis" or "pitch axis", is an imaginary
>>>>>>>>>>> line running horizontally across the platform and through
>>>>>>>>>>> its center of gravity. In pitch motion, the leading edge of
>>>>>>>>>>> the platform moves vertically upwards while the rear moves
>>>>>>>>>>> vertically downwards, and vice versa.
>>>>>>>>>>>
>>>>>>>>>>> Roll
>>>>>>>>>>> "Roll" means rotation of the platform in the vertical plane
>>>>>>>>>>> about its longitudinal/X axis. The longitudinal/X axis, also
>>>>>>>>>>> known as the "roll axis", is an imaginary line running
>>>>>>>>>>> horizontally through the length of the platform and through
>>>>>>>>>>> its center of gravity. In roll motion, the platform tilts
>>>>>>>>>>> such that one side moves vertically upwards while the other
>>>>>>>>>>> moves vertically downwards, and vice versa.
>>>>>>>>>>>
>>>>>>>>>>> Yaw
>>>>>>>>>>> "Yaw" means rotation of the platform in the horizontal plane
>>>>>>>>>>> about its vertical/Z axis. The vertical/Z axis, also known
>>>>>>>>>>> as the "yaw axis", is an imaginary line running vertically
>>>>>>>>>>> through the platform and through its center of gravity. In
>>>>>>>>>>> yaw motion, the platform rotates clockwise or counter
>>>>>>>>>>> clockwise in the horizontal, relative to its orientation,
>>>>>>>>>>> which has the standard name platform_orientation.
>>>>>>>>>>>
>>>>>>>>>>> Are these okay?
>>>>>>>>>>>
>>>>>>>>>>> For names such as platform_view_angle and
>>>>>>>>>>> platform_zenith_angle we also describe how the angle itself
>>>>>>>>>>> is measured. We should do the same for pitch, roll and yaw
>>>>>>>>>>> angles while we are in the process of updating the
>>>>>>>>>>> definitions. I have come up with the following:
>>>>>>>>>>>
>>>>>>>>>>> Pitch angle
>>>>>>>>>>> Platform pitch angle is the angle between the local
>>>>>>>>>>> horizontal and the platform's longitudinal/X axis. Zero
>>>>>>>>>>> pitch angle means the longitudinal axis is horizontal. The
>>>>>>>>>>> usual sign convention is that pitch angle is measured
>>>>>>>>>>> positive when the front or leading edge of the platform is
>>>>>>>>>>> elevated above the horizontal, negative when it is below the
>>>>>>>>>>> horizontal.
>>>>>>>>>>>
>>>>>>>>>>> Roll angle
>>>>>>>>>>> Platform roll angle is the angle between the local
>>>>>>>>>>> horizontal and the platform's lateral/Y axis. Zero roll
>>>>>>>>>>> angle means the lateral axis is horizontal. The usual sign
>>>>>>>>>>> convention is that roll angle is measured positive when the
>>>>>>>>>>> right hand edge of the platform (when viewing towards the
>>>>>>>>>>> orientation direction or "front" of the platform) is
>>>>>>>>>>> elevated above the horizontal, negative when it is below the
>>>>>>>>>>> horizontal.
>>>>>>>>>>>
>>>>>>>>>>> Yaw angle
>>>>>>>>>>> Platform yaw angle is the angle between the platform's
>>>>>>>>>>> longitudinal/X axis and the direction of travel. Zero yaw
>>>>>>>>>>> angle means the longitudinal axis is aligned with the
>>>>>>>>>>> direction of travel, or a reference direction if the
>>>>>>>>>>> platform is stationary. The usual sign convention is that
>>>>>>>>>>> yaw angle is measured positive when the front or leading
>>>>>>>>>>> edge of the platform is rotated clockwise from its
>>>>>>>>>>> orientation (which has the standard name platform_orientation).
>>>>>>>>>>>
>>>>>>>>>>> Just so we can see a couple of examples of pulling all this
>>>>>>>>>>> together, I've written out the full revised definitions of
>>>>>>>>>>> platform platform_pitch_angle and platform_pitch_rate below.
>>>>>>>>>>>
>>>>>>>>>>> platform_pitch_angle (degree)
>>>>>>>>>>> 'Standard names for "platform" describe the motion and
>>>>>>>>>>> orientation of the vehicle from which observations are made.
>>>>>>>>>>> Platforms include, but are not limited to, satellites,
>>>>>>>>>>> aeroplanes, ships, instruments and buoys. "Pitch" means
>>>>>>>>>>> rotation of the platform in the vertical plane about its
>>>>>>>>>>> transverse/Y axis. The transverse/Y axis, also known as the
>>>>>>>>>>> "lateral axis" or "pitch axis", is an imaginary line running
>>>>>>>>>>> horizontally across the platform and through its center of
>>>>>>>>>>> gravity. In pitch motion, the leading edge of the platform
>>>>>>>>>>> moves vertically upwards while the rear moves vertically
>>>>>>>>>>> downwards, and vice versa. Platform pitch angle is the angle
>>>>>>>>>>> between the local horizontal and the platform's
>>>>>>>>>>> longitudinal/X axis. Zero pitch angle means the longitudinal
>>>>>>>>>>> axis is horizontal. The usual sign convention is that pitch
>>>>>>>>>>> angle is measured positive when the front or leading edge of
>>>>>>>>>>> the platform is elevated above the horizontal, negative when
>>>>>>>>>>> it is below the horizontal.'
>>>>>>>>>>>
>>>>>>>>>>> platform_pitch_rate (degree s-1)
>>>>>>>>>>> 'Standard names for "platform" describe the motion and
>>>>>>>>>>> orientation of the vehicle from which observations are made.
>>>>>>>>>>> Platforms include, but are not limited to, satellites,
>>>>>>>>>>> aeroplanes, ships, instruments and buoys. "Pitch" means
>>>>>>>>>>> rotation of the platform in the vertical plane about its
>>>>>>>>>>> transverse/Y axis. The transverse/Y axis, also known as the
>>>>>>>>>>> "lateral axis" or "pitch axis", is an imaginary line running
>>>>>>>>>>> horizontally across the platform and through its center of
>>>>>>>>>>> gravity. In pitch motion, the leading edge of the platform
>>>>>>>>>>> moves vertically upwards while the rear moves vertically
>>>>>>>>>>> downwards, and vice versa. The quantity with standard name
>>>>>>>>>>> platform_pitch_rate is the change per unit time in the
>>>>>>>>>>> quantity with standard name platform_pitch_angle.'
>>>>>>>>>>>
>>>>>>>>>>> The roll and yaw definitions would be constructed similarly.
>>>>>>>>>>>
>>>>>>>>>>> The pitch/roll/yaw names are still under discussion. I'd
>>>>>>>>>>> welcome further comments on these.
>>>>>>>>>>>
>>>>>>>>>>> Best wishes,
>>>>>>>>>>> Alison
>>>>>>>>>>>
>>>>>>>>>>> ------
>>>>>>>>>>> Alison Pamment???????????????????????????????? Tel: +44 1235
>>>>>>>>>>> 778065
>>>>>>>>>>> NCAS/Centre for Environmental Data Archival???
>>>>>>>>>>> Email:alison.pamment at stfc.ac.uk
>>>>>>>>>>> <mailto:alison.pamment at stfc.ac.uk>
>>>>>>>>>>> STFC Rutherford Appleton Laboratory
>>>>>>>>>>> R25, 2.22
>>>>>>>>>>> Harwell Oxford, Didcot, OX11 0QX, U.K.
>>>>>>>>>>>
>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>> From: CF-metadata<cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>? On Behalf Of
>>>>>>>>>>> Hamilton, Steve
>>>>>>>>>>> Sent: 11 July 2018 10:52
>>>>>>>>>>> To:cf-metadata at cgd.ucar.edu <mailto:cf-metadata at cgd.ucar.edu>
>>>>>>>>>>> Subject: Re: [CF-metadata] Platform Heave
>>>>>>>>>>>
>>>>>>>>>>> Hi Nan,
>>>>>>>>>>>
>>>>>>>>>>> I agree expanding on the existing standard name descriptions
>>>>>>>>>>> does make sense and standardising for _rate and _angle
>>>>>>>>>>>
>>>>>>>>>>> What you suggest below seems acceptable
>>>>>>>>>>>
>>>>>>>>>>> Thanks
>>>>>>>>>>>
>>>>>>>>>>> Steve
>>>>>>>>>>>
>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>> From: CF-metadata<cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>? On Behalf Of Nan
>>>>>>>>>>> Galbraith
>>>>>>>>>>> Sent: 10 July 2018 17:39
>>>>>>>>>>> To:cf-metadata at cgd.ucar.edu <mailto:cf-metadata at cgd.ucar.edu>
>>>>>>>>>>> Subject: Re: [CF-metadata] Platform Heave
>>>>>>>>>>>
>>>>>>>>>>> Hi Alison, Steve, and all -
>>>>>>>>>>>
>>>>>>>>>>> Since we have a little time to finalize this, could we also
>>>>>>>>>>> consider updating the definitions of platform_pitch_angle,
>>>>>>>>>>> platform_roll_angle and platform_yaw_angle?
>>>>>>>>>>>
>>>>>>>>>>> Currently, these all say 'Standard names for platform
>>>>>>>>>>> describe the motion and orientation of the vehicle from
>>>>>>>>>>> which observations are made e.g. aeroplane, ship or satellite.'
>>>>>>>>>>>
>>>>>>>>>>> John Helly pointed to the helpful Wikipedia page for ship
>>>>>>>>>>> motion,https://en.wikipedia.org/wiki/Ship_motions
>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Ship-5Fmotions&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=gxXkUfvVSqtWNEzxwyAeuKgEMzADzXWv2OOZtOBRAao&e=>.
>>>>>>>>>>> The suggestions below are merged from different sections of
>>>>>>>>>>> that page, and might be a little ... long, but I'd also like
>>>>>>>>>>> to append something like 'Platforms include but are not
>>>>>>>>>>> limited to satellites, aeroplanes, ships, instruments, and
>>>>>>>>>>> buoys.'
>>>>>>>>>>>
>>>>>>>>>>> Pitch
>>>>>>>>>>> The up/down rotation of a platform about its transverse/Y
>>>>>>>>>>> axis. The transverse/Y axis, lateral or pitch axis is an
>>>>>>>>>>> imaginary line running horizontally across the platform and
>>>>>>>>>>> through its center of gravity. A pitch? motion is an
>>>>>>>>>>> up-or-down movement of the bow and stern of the platform.
>>>>>>>>>>>
>>>>>>>>>>> Roll
>>>>>>>>>>> The tilting rotation of a platform about its longitudinal/X
>>>>>>>>>>> axis. The longitudinal/X axis, or roll axis, is an imaginary
>>>>>>>>>>> line running horizontally through the length of the
>>>>>>>>>>> platform, through its center of gravity, and parallel to the
>>>>>>>>>>> waterline. A roll motion is a side-to-side or port-starboard
>>>>>>>>>>> tilting motion of the superstructure around this axis.
>>>>>>>>>>>
>>>>>>>>>>> Yaw
>>>>>>>>>>> The turning rotation of a platform about its vertical/Z
>>>>>>>>>>> axis. The vertical/Z axis, or yaw axis, is an imaginary line
>>>>>>>>>>> running vertically through the platform and through its
>>>>>>>>>>> center of gravity.
>>>>>>>>>>> A yaw motion is a side-to side movement of the bow and stern
>>>>>>>>>>> of the ship.
>>>>>>>>>>>
>>>>>>>>>>> And we had something like this for heave:
>>>>>>>>>>> platform_heave (m) = upwards vertical displacement
>>>>>>>>>>>
>>>>>>>>>>> I suppose these could also be applied to platform_*_rates.
>>>>>>>>>>>
>>>>>>>>>>> Regards -
>>>>>>>>>>> Nan
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On 7/4/18 4:47 AM, Alison Pamment - UKRI STFC wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Dear Steve,? > > Thank you for your message and apologies
>>>>>>>>>>>> for not
>>>>>>>>>>>> having processed
>>>>>>>>>>> ? > your proposals as yet. I have been working on the CMIP
>>>>>>>>>>> names, but > they are reaching a conclusion and I will
>>>>>>>>>>> shortly be looking through > the many other proposals that
>>>>>>>>>>> have been waiting for attention. > > A quick look through
>>>>>>>>>>> the discussion of your names shows they are > pretty much
>>>>>>>>>>> agreed. You need take no further action at this time - I >
>>>>>>>>>>> will check that the names and definitions are clear and
>>>>>>>>>>> consistent > with existing names and get back to you on the
>>>>>>>>>>> list with any final > comments or questions. Version 56 of
>>>>>>>>>>> the standard name table will be > published later today - I
>>>>>>>>>>> think we can probably finalise your names > in time for
>>>>>>>>>>> version 57. > > Best wishes, Alison
>>>>>>>>>>>> ________________________________
>>>>>>>>>>>> From: Hamilton, Steve<sj.hamilton at fugro.com>
>>>>>>>>>>>> <mailto:sj.hamilton at fugro.com>
>>>>>>>>>>>> Sent: 03 July 2018 09:12
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Please can you advise if this standard name has now been
>>>>>>>>>>>> accepted and
>>>>>>>>>>>> when it will be included in the CF Standard Names
>>>>>>>>>>>>
>>>>>>>>>>>> If there is something else to do please let me know
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks
>>>>>>>>>>>>
>>>>>>>>>>>> Steve
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> ________________________________
>>>>>>>>>>>> From: Jim Biard <jbiard at cicsnc.org
>>>>>>>>>>>> <mailto:jbiard at cicsnc.org><mailto:jbiard at cicsnc.org>
>>>>>>>>>>>> <mailto:jbiard at cicsnc.org>>
>>>>>>>>>>>> Sent: 01 June 2018 22:56
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Nan,
>>>>>>>>>>>> Thanks for pulling things back in. I very much like the
>>>>>>>>>>>> idea of keeping technology or specific methods out of the
>>>>>>>>>>>> definition if at all possible, so I like your proposal. I
>>>>>>>>>>>> expect we should include platform in the definition, as
>>>>>>>>>>>> well as an indication that this is dynamic (over time). How
>>>>>>>>>>>> about these definitions?
>>>>>>>>>>>> platform_heave (m) = upwards vertical displacement of a
>>>>>>>>>>>> platform over
>>>>>>>>>>>> a measurement time interval platform_heave_rate (m s-1) =
>>>>>>>>>>>> upwards rate
>>>>>>>>>>>> of change in vertical displacement of a platform over a
>>>>>>>>>>>> measurement time interval They leave out some detail but
>>>>>>>>>>>> capture the relative nature of the quantities.
>>>>>>>>>>>> (In my mind, the primary detail being left out is the 'net
>>>>>>>>>>>> zero'
>>>>>>>>>>>> nature of the quantities, which gets back to defining the
>>>>>>>>>>>> 'moving-mean' sea level reference point.) Grace and peace,
>>>>>>>>>>>>
>>>>>>>>>>>> Jim
>>>>>>>>>>>> On 6/1/18 11:23 AM, Nan Galbraith wrote:
>>>>>>>>>>>> Hi all -
>>>>>>>>>>>>
>>>>>>>>>>>> The latest version is confusing to me. The term 'a platform
>>>>>>>>>>>> that is
>>>>>>>>>>>> nominally at rest' does not apply to many platforms for
>>>>>>>>>>>> which heave is
>>>>>>>>>>>> calculated; the original version of that, 'a moving object
>>>>>>>>>>>> above the
>>>>>>>>>>>> vertical level of that object when stationary' was maybe a
>>>>>>>>>>>> little more clear... if also a little wordy.
>>>>>>>>>>>>
>>>>>>>>>>>> And, the term? 'vertical displacement determined by
>>>>>>>>>>>> integrating
>>>>>>>>>>>> vertical accelerations' may also not apply - I've been
>>>>>>>>>>>> looking at the
>>>>>>>>>>>> different ways heave is calculated, and there are a few:
>>>>>>>>>>>> 'Heave can be
>>>>>>>>>>>> computed from GPS RTK height measurements and from vertical
>>>>>>>>>>>> accelerations measured by linear accelerometers'
>>>>>>>>>>>>
>>>>>>>>>>>> Why? not keep it simple: platform_heave (m) = upwards vertical
>>>>>>>>>>>> displacement?? Do we need to be more specific than that?
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks - Nan
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> From: Lowry, Roy K.
>>>>>>>>>>>> Sent: 30 May 2018 21:37
>>>>>>>>>>>>
>>>>>>>>>>>> An afterthought. Heave is conventionally positive upwards
>>>>>>>>>>>> so to make this clear I would add the word 'upwards' thus:
>>>>>>>>>>>>
>>>>>>>>>>>> platform_heave (m) = upwards vertical displacement
>>>>>>>>>>>> determined by integrating vertical accelerations of a
>>>>>>>>>>>> platform that is nominally at rest.
>>>>>>>>>>>>
>>>>>>>>>>>> platform_heave_rate (m s-1) = upwards vertical velocity
>>>>>>>>>>>> determined by integrating vertical accelerations of a
>>>>>>>>>>>> platform that is nominally at rest.
>>>>>>>>>>>>
>>>>>>>>>>>> Cheers. Roy.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> ----------------------------------------------------------------------
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>>
>>>>>>>>>>>> From: Lowry, Roy K. <rkl at bodc.ac.uk
>>>>>>>>>>>> <mailto:rkl at bodc.ac.uk><mailto:rkl at bodc.ac.uk>
>>>>>>>>>>>> <mailto:rkl at bodc.ac.uk>
>>>>>>>>>>>> Sent: 30 May 2018 21:02
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks Jim,
>>>>>>>>>>>>
>>>>>>>>>>>> That work for me.
>>>>>>>>>>>>
>>>>>>>>>>>> Cheers, Roy.
>>>>>>>>>>>>
>>>>>>>>>>>> ----------------------------------------------------------------------
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>>
>>>>>>>>>>>> From: Jim Biard<jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org>
>>>>>>>>>>>> Sent: 30 May 2018 18:39
>>>>>>>>>>>>
>>>>>>>>>>>> Roy,
>>>>>>>>>>>>
>>>>>>>>>>>> So, heave is integrated vertical acceleration? How about
>>>>>>>>>>>>
>>>>>>>>>>>> platform_heave (m) = vertical displacement determined by
>>>>>>>>>>>> integrating vertical accelerations of a platform that is
>>>>>>>>>>>> nominally at rest.
>>>>>>>>>>>>
>>>>>>>>>>>> platform_heave_rate (m s-1) = vertical velocity determined
>>>>>>>>>>>> by integrating vertical accelerations of a platform that is
>>>>>>>>>>>> nominally at rest.
>>>>>>>>>>>>
>>>>>>>>>>>> Jim
>>>>>>>>>>>>
>>>>>>>>>>>> On 5/27/18 5:38 AM, Lowry, Roy K. wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> ????? Hi Jim,
>>>>>>>>>>>>
>>>>>>>>>>>> ????? Does
>>>>>>>>>>>>
>>>>>>>>>>>> ?????????? "Heave" is a term used to describe the vertical
>>>>>>>>>>>> displacement
>>>>>>>>>>>> ????????? of a moving object above the vertical level of
>>>>>>>>>>>> that object
>>>>>>>>>>>> ????????? when stationary.
>>>>>>>>>>>>
>>>>>>>>>>>> ????? help by getting rid of the semantically-loaded word
>>>>>>>>>>>> 'height'?
>>>>>>>>>>>> ????? If not, what would?
>>>>>>>>>>>>
>>>>>>>>>>>> ????? I think the confusion is because you are thinking of
>>>>>>>>>>>> heave in
>>>>>>>>>>>> ????? terms of position within a reference frame. To think
>>>>>>>>>>>> of it as the
>>>>>>>>>>>> ????? vertical displacement between a real platform and a
>>>>>>>>>>>> massless
>>>>>>>>>>>> ????? platform is misleading- such considerations are part
>>>>>>>>>>>> of the
>>>>>>>>>>>> ????? derivation of wave height from high frequency heave
>>>>>>>>>>>> measurements,
>>>>>>>>>>>> ????? which isn't relevant to a discussion of the raw
>>>>>>>>>>>> measurement. It's
>>>>>>>>>>>> ????? also worth bearing in mind that whilst the debate has
>>>>>>>>>>>> focused on
>>>>>>>>>>>> ????? platforms floating on the sea surface, the concept of
>>>>>>>>>>>> heave could
>>>>>>>>>>>> ????? in theory be applied to objects in the atmosphere.
>>>>>>>>>>>>
>>>>>>>>>>>> ????? In practice, heave is measured by accelerometers that
>>>>>>>>>>>> are usually
>>>>>>>>>>>> ????? combined with tilt sensors that give pitch, roll and
>>>>>>>>>>>> yaw. Hence,
>>>>>>>>>>>> ????? it is totally decoupled from any reference outside
>>>>>>>>>>>> the platform.
>>>>>>>>>>>>
>>>>>>>>>>>> ????? To answer your last muse, to get heave from a high
>>>>>>>>>>>> frequency
>>>>>>>>>>>> ????? height relative to datum time series the method would
>>>>>>>>>>>> need to
>>>>>>>>>>>> ????? determine the height of the object when 'stationary'.
>>>>>>>>>>>> In the case
>>>>>>>>>>>> ????? of objects on the sea, 'stationary' is considered to
>>>>>>>>>>>> be a flat
>>>>>>>>>>>> ????? calm sea (i.e. no waves), which can be approximated
>>>>>>>>>>>> by averaging
>>>>>>>>>>>> ????? the raw time series. So, heave could be approximated by
>>>>>>>>>>>> ????? differencing the raw and averaged data. However, I
>>>>>>>>>>>> can't think why
>>>>>>>>>>>> ????? anybody would want to do that.
>>>>>>>>>>>>
>>>>>>>>>>>> ????? Cheers, Roy.
>>>>>>>>>>>>
>>>>>>>>>>>> ?????
>>>>>>>>>>>> ----------------------------------------------------------------------
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>>
>>>>>>>>>>>> ????? From:Jim Biard<jbiard at cicsnc.org>
>>>>>>>>>>>> <mailto:jbiard at cicsnc.org><mailto:jbiard at cicsnc.org>
>>>>>>>>>>>> <mailto:jbiard at cicsnc.org>
>>>>>>>>>>>> ????? Sent: 26 May 2018 23:18
>>>>>>>>>>>>
>>>>>>>>>>>> ????? My biggest concern is that the standard name
>>>>>>>>>>>> definition makes it
>>>>>>>>>>>> ????? clear in some fashion or other that this is a measure of
>>>>>>>>>>>> ????? deviations from some lower frequency (or low-pass
>>>>>>>>>>>> filtered)
>>>>>>>>>>>> ????? measure of vertical position. (As are sway and surge
>>>>>>>>>>>> in relation
>>>>>>>>>>>> ????? to their corresponding horizontal coordinates.) As
>>>>>>>>>>>> was pointed
>>>>>>>>>>>> ????? out, heave is used in certain communities, so it's
>>>>>>>>>>>> reasonable to
>>>>>>>>>>>> ????? provide a standard name, but it seems rather
>>>>>>>>>>>> imprecise as it has
>>>>>>>>>>>> ????? been described so far.
>>>>>>>>>>>>
>>>>>>>>>>>> ????? If I have understood the explanations correctly, a
>>>>>>>>>>>> time series of
>>>>>>>>>>>> ????? platform height relative to a fixed datum that has
>>>>>>>>>>>> sufficient
>>>>>>>>>>>> ????? precision and frequency would fully represent the
>>>>>>>>>>>> heave along with
>>>>>>>>>>>> ????? the more slowly varying effects of tide, waves, etc.
>>>>>>>>>>>> So is heave,
>>>>>>>>>>>> ????? as usually used, the first-order instantaneous
>>>>>>>>>>>> difference between
>>>>>>>>>>>> ????? the height of an actual platform and the height of a
>>>>>>>>>>>> massless
>>>>>>>>>>>> ????? ideal platform that would maintain a fixed offset
>>>>>>>>>>>> relative to the
>>>>>>>>>>>> ????? sea surface? And, just out of curiosity, how would a
>>>>>>>>>>>> time series
>>>>>>>>>>>> ????? of instantaneous measures of height relative to a
>>>>>>>>>>>> fixed datum be
>>>>>>>>>>>> ????? separated in practice into heave and "non-heave" height?
>>>>>>>>>>>>
>>>>>>>>>>>> ????? Getting back on track, it seems to me that the
>>>>>>>>>>>> definition ought to
>>>>>>>>>>>> ????? somehow assist the reader in understanding how heave
>>>>>>>>>>>> relates to
>>>>>>>>>>>> ????? other measures of height.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> ????? On Sat, May 26, 2018 at 3:11 AM, Lowry, Roy K. wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? Dear Jim and John,
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? Heave is indeed a height relative to a datum,
>>>>>>>>>>>> that datum being
>>>>>>>>>>>> ????????? the calm sea surface, which is a local short
>>>>>>>>>>>> interval mean sea
>>>>>>>>>>>> ????????? level that isn't linked into any global reference
>>>>>>>>>>>> system.
>>>>>>>>>>>> ????????? Indeed the 'datum' moves relative to the rest of
>>>>>>>>>>>> the world -
>>>>>>>>>>>> ????????? but not the platform - as tide rises and falls so
>>>>>>>>>>>> many would
>>>>>>>>>>>> ????????? prefer to call it an 'instrument zero' rather
>>>>>>>>>>>> than a 'datum'.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? Heave is therefore a very different measurement
>>>>>>>>>>>> to any sea
>>>>>>>>>>>> ????????? level parameter and is the raw measurement
>>>>>>>>>>>> recorded at high
>>>>>>>>>>>> ????????? (Hz to kHz) frequency as a time series by
>>>>>>>>>>>> floating wave
>>>>>>>>>>>> ????????? instruments such as waveriders and shipborne wave
>>>>>>>>>>>> recorders.
>>>>>>>>>>>> ????????? It therefore cannot be sensibly described by the
>>>>>>>>>>>> same or
>>>>>>>>>>>> ????????? similar Standard Name as a measurement of height
>>>>>>>>>>>> above a
>>>>>>>>>>>> ????????? globally referenced datum like long-term mean sea
>>>>>>>>>>>> level or
>>>>>>>>>>>> ????????? geoid. Whilst the Standard Name could be
>>>>>>>>>>>> ????????? 'platform_height_above_calm_sea_surface' or
>>>>>>>>>>>> ????????? 'platform_height_above_stationary_position' I
>>>>>>>>>>>> would argue that
>>>>>>>>>>>> ????????? 'heave' is a term from the same domain vocabulary
>>>>>>>>>>>> as 'pitch',
>>>>>>>>>>>> ????????? 'roll' and 'yaw' and therefore should be used.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? John is right to point out that the heave
>>>>>>>>>>>> measurement is
>>>>>>>>>>>> ????????? affected by the nature of the platform with a
>>>>>>>>>>>> 250,000 tonne
>>>>>>>>>>>> ????????? supertanker moving up and down much less than a
>>>>>>>>>>>> rowing boat in
>>>>>>>>>>>> ????????? a given wave climate, especially a wind sea. That
>>>>>>>>>>>> was what was
>>>>>>>>>>>> ????????? behind the SBWR corrections based on platform
>>>>>>>>>>>> dimensions set
>>>>>>>>>>>> ????????? up by Laurie Draper and Tom Tucker back in the
>>>>>>>>>>>> 1980s.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? Cheers, Roy.
>>>>>>>>>>>>
>>>>>>>>>>>> ?????????
>>>>>>>>>>>> ----------------------------------------------------------------------
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? From: John Helly<hellyj at ucsd.edu>
>>>>>>>>>>>> <mailto:hellyj at ucsd.edu>
>>>>>>>>>>>> ????????? Sent: 26 May 2018 04:48
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? Can't let go of this yet.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? If you think about the inverse problem of
>>>>>>>>>>>> deriving the sea
>>>>>>>>>>>> ????????? surface elevation from the heave you would have
>>>>>>>>>>>> to account for
>>>>>>>>>>>> ????????? the latency of ship motion relative to the
>>>>>>>>>>>> sea-surface. A
>>>>>>>>>>>> ????????? wave passing under a ship induces motions that
>>>>>>>>>>>> are not
>>>>>>>>>>>> ????????? instantaneous either in attack or decay.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? J.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????? On 5/25/18 20:42, John Helly wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? I believe it's a synonym within the
>>>>>>>>>>>> oceanographic
>>>>>>>>>>>> ????????????? community for the vertical motion of an
>>>>>>>>>>>> ocean-going platform.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? https://en.wikipedia.org/wiki/Ship_motions
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Ship-5Fmotions&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=gxXkUfvVSqtWNEzxwyAeuKgEMzADzXWv2OOZtOBRAao&e=>
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? Ship motions - Wikipedia
>>>>>>>>>>>> ????????????? <https://en.wikipedia.org/wiki/Ship_motions>
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Ship-5Fmotions&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=gxXkUfvVSqtWNEzxwyAeuKgEMzADzXWv2OOZtOBRAao&e=><https://en.wikipedia.org/
>>>>>>>>>>>> wiki/Ship_motions>
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Ship-5Fmotions&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=gxXkUfvVSqtWNEzxwyAeuKgEMzADzXWv2OOZtOBRAao&e=>
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? en.wikipedia.org
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__en.wikipedia.org_&d=DwMFaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=J2x5E3dUpn954rPN8-v-TFQOZiyobvfd2MaoRgJ8_Zg&s=vxsAvAgVXgUOS72MntIS3EeYgiYMynA6M4SbIbilSDk&e=>
>>>>>>>>>>>> <http://en.wikipedia.org>
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__en.wikipedia.org&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=tpfIR7_HY7_jSNmPjinu0I6CgCY2PCb65KOJTYnwrFg&e=><http://en.wikipedia.org>
>>>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__en.wikipedia.org&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=tpfIR7_HY7_jSNmPjinu0I6CgCY2PCb65KOJTYnwrFg&e=>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? Ship motions are defined by the six degrees
>>>>>>>>>>>> of freedom
>>>>>>>>>>>> ????????????? that a ship, boat or any other craft can
>>>>>>>>>>>> experience.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? Could just be jargon but it strike me as more
>>>>>>>>>>>> complex:
>>>>>>>>>>>> ????????????? nonetheless a vertical position relative to a
>>>>>>>>>>>> datum, but
>>>>>>>>>>>> ????????????? the buoyancy, stability and momentum of the
>>>>>>>>>>>> platform are
>>>>>>>>>>>> ????????????? implied as part of the dynamics.? It seems
>>>>>>>>>>>> that the datum
>>>>>>>>>>>> ????????????? is not a geophysical one alone but confounded
>>>>>>>>>>>> with the
>>>>>>>>>>>> ????????????? 'normal' waterline for a platform so it may
>>>>>>>>>>>> be relative to
>>>>>>>>>>>> ????????????? the water level in which the platform is
>>>>>>>>>>>> embedded. That's
>>>>>>>>>>>> ????????????? a tough one. Two different platforms on the
>>>>>>>>>>>> same sea
>>>>>>>>>>>> ????????????? surface would have different 'heave', for
>>>>>>>>>>>> example.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? J.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????? On 5/25/18 19:54, Jim Biard wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????? Hi.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????? I get and endorse the need for pitch,
>>>>>>>>>>>> roll, and yaw,
>>>>>>>>>>>> ????????????????? but I remain perplexed about heave. How
>>>>>>>>>>>> is a time
>>>>>>>>>>>> ????????????????? series of 'heave' different from a time
>>>>>>>>>>>> series of
>>>>>>>>>>>> ????????????????? height relative to some vertical datum?
>>>>>>>>>>>> I've yet to
>>>>>>>>>>>> ????????????????? see a proposed definition that convinces
>>>>>>>>>>>> me that this
>>>>>>>>>>>> ????????????????? is a uniquely different quantity.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????? Grace and peace,
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????? Jim
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????? On Fri, May 25, 2018 at 7:28 AM, Lowry,
>>>>>>>>>>>> Roy K.
>>>>>>>>>>>> ????????????????? <rkl at bodc.ac.uk
>>>>>>>>>>>> <mailto:rkl at bodc.ac.uk><mailto:rkl at bodc.ac.uk>
>>>>>>>>>>>> <mailto:rkl at bodc.ac.uk>? wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????????? Dear All,
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????????? I agree with Nan that definitions of
>>>>>>>>>>>> pitch roll
>>>>>>>>>>>> ????????????????????? and yaw would improve the existing
>>>>>>>>>>>> Standard Name
>>>>>>>>>>>> ????????????????????? definitions. I also agree with using
>>>>>>>>>>>> the existing
>>>>>>>>>>>> ????????????????????? orientation Standard Names for ADCPs
>>>>>>>>>>>> and that the
>>>>>>>>>>>> ????????????????????? 'platform' definition wording could
>>>>>>>>>>>> make this
>>>>>>>>>>>> ????????????????????? clearer. However, such an
>>>>>>>>>>>> enhancements should be
>>>>>>>>>>>> ????????????????????? submitted as a separate proposal and
>>>>>>>>>>>> not be
>>>>>>>>>>>> ????????????????????? considered as part of Steve's proposal.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????????? Cheers, Roy.
>>>>>>>>>>>>
>>>>>>>>>>>> ?????????????????????
>>>>>>>>>>>> ----------------------------------------------------------------------
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????????? From:? Nan
>>>>>>>>>>>> Galbraith<ngalbraith at whoi.edu> <mailto:ngalbraith at whoi.edu>
>>>>>>>>>>>> ????????????????????? Sent: 25 May 2018 14:46
>>>>>>>>>>>> ?????????????????????
>>>>>>>>>>>> ????????????????????? I'd really like to see pitch, roll
>>>>>>>>>>>> and yaw defined
>>>>>>>>>>>> ????????????????????? in the CF standard name table; currently
>>>>>>>>>>>> ????????????????????? the definitions only say 'Standard
>>>>>>>>>>>> names for
>>>>>>>>>>>> ????????????????????? platform describe the motion and
>>>>>>>>>>>> orientation
>>>>>>>>>>>> ????????????????????? of the vehicle from which
>>>>>>>>>>>> observations are made
>>>>>>>>>>>> ????????????????????? e.g. aeroplane, ship or satellite.'
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????????? Also, not to get too far into the
>>>>>>>>>>>> weeds, but many
>>>>>>>>>>>> ????????????????????? of the platform terms are important
>>>>>>>>>>>> ????????????????????? for instruments like ADCPs, so I'd
>>>>>>>>>>>> just like to
>>>>>>>>>>>> ????????????????????? confirm that these definitions - and
>>>>>>>>>>>> ????????????????????? the names themselves - can be used to
>>>>>>>>>>>> describe
>>>>>>>>>>>> ????????????????????? instruments, not just vehicles
>>>>>>>>>>>> ????????????????????? 'e.g. aeroplane, ship or satellite'.
>>>>>>>>>>>> We already
>>>>>>>>>>>> ????????????????????? use pitch roll and yaw for these
>>>>>>>>>>>> ????????????????????? instruments on surface moorings, and
>>>>>>>>>>>> I hope (and
>>>>>>>>>>>> ????????????????????? assume) this is legal.
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????????? Thanks - Nan Galbraith
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> ????????????????????? On 5/25/18 8:53 AM, Lowry, Roy K. wrote:
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > Dear Steve,
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > One of the reasons I was interested
>>>>>>>>>>>> in your
>>>>>>>>>>>> ????????????????????? definitions was your
>>>>>>>>>>>> ????????????????????? > perspective on the datum (i.e. zero
>>>>>>>>>>>> value) for
>>>>>>>>>>>> ????????????????????? heave. The datum
>>>>>>>>>>>> ????????????????????? > 'mean_sea_level' is well used in
>>>>>>>>>>>> CF, but with
>>>>>>>>>>>> ????????????????????? the definition 'time
>>>>>>>>>>>> ????????????????????? > mean of sea surface elevation at a
>>>>>>>>>>>> given
>>>>>>>>>>>> ????????????????????? location over an arbitrary
>>>>>>>>>>>> ????????????????????? > period sufficient to eliminate the
>>>>>>>>>>>> tidal
>>>>>>>>>>>> ????????????????????? signals.' This is obviously
>>>>>>>>>>>> ????????????????????? > not appropriate for platform heave
>>>>>>>>>>>> which doesn't
>>>>>>>>>>>> ????????????????????? take any account of
>>>>>>>>>>>> ????????????????????? > the state of the tide and so I
>>>>>>>>>>>> would exclude
>>>>>>>>>>>> ????????????????????? 'mean_sea_level' from the
>>>>>>>>>>>> ????????????????????? > Standard Name.
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > I think my preference would be to
>>>>>>>>>>>> keep the term
>>>>>>>>>>>> ????????????????????? 'heave' as we already
>>>>>>>>>>>> ????????????????????? > have 'pitch', 'yaw' and 'roll',
>>>>>>>>>>>> giving:
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > platform_heave (m)
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > Standard names for platform
>>>>>>>>>>>> describe the motion
>>>>>>>>>>>> ????????????????????? and orientation of the
>>>>>>>>>>>> ????????????????????? > vehicle from which observations are
>>>>>>>>>>>> made e.g.
>>>>>>>>>>>> ????????????????????? aeroplane, ship or
>>>>>>>>>>>> ????????????????????? > satellite. "Heave" is a term used
>>>>>>>>>>>> to describe
>>>>>>>>>>>> ????????????????????? the vertical
>>>>>>>>>>>> ????????????????????? > displacement of the platform above
>>>>>>>>>>>> its position
>>>>>>>>>>>> ????????????????????? when not moving.
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > tendency_of_platform_heave (m s-1)
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > Standard names for platform
>>>>>>>>>>>> describe the motion
>>>>>>>>>>>> ????????????????????? and orientation of the
>>>>>>>>>>>> ????????????????????? > vehicle from which observations are
>>>>>>>>>>>> made e.g.
>>>>>>>>>>>> ????????????????????? aeroplane, ship or
>>>>>>>>>>>> ????????????????????? > satellite. "Tendency_of_X" means
>>>>>>>>>>>> derivative of X
>>>>>>>>>>>> ????????????????????? with respect to time.
>>>>>>>>>>>> ????????????????????? > "Heave" is a term used to describe
>>>>>>>>>>>> the vertical
>>>>>>>>>>>> ????????????????????? displacement of the
>>>>>>>>>>>> ????????????????????? > platform above its position when
>>>>>>>>>>>> not moving.
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > What do you think?
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? >
>>>>>>>>>>>> ????????????????????? > Cheers, Roy.
>>>>>>>>>>>> ??????????
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> *******************************************************
>>>>>>>>>>> * Nan Galbraith??????? Information Systems Specialist *
>>>>>>>>>>> * Upper Ocean Processes Group??????????? Mail Stop 29 *
>>>>>>>>>>> * Woods Hole Oceanographic Institution??????????????? *
>>>>>>>>>>> * Woods Hole, MA 02543???????????????? (508) 289-2444 *
>>>>>>>>>>> *******************************************************
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>
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>>>>>>>>>>
>>>>>>>>>> --
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>>>>>>>>>> ????*Jim Biard*
>>>>>>>>>> *Research Scholar*
>>>>>>>>>> Cooperative Institute for Climate and Satellites
>>>>>>>>>> NC<https://urldefense.proofpoint.com/v2/url?u=http-3A__cicsnc.org_&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=J44MNoS3a3tRZadexG7eUT9VHnim-C1Q38Gg053klgA&e=>
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>>>>>>>>>> and geophysics
>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.facebook.com_NOAANCEIoceangeo&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=8ApaGoSCCCRFwF6j3evIWD8um0l0N0Avdz4cny_m_Zs&e=>information,
>>>>>>>>>> and follow us on Twitter at at NOAANCEIclimate
>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_NOAANCEIclimate&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=zpNjm0rVsNRvcMCt5onLOEFwqoxJwb1z4nrtZXIDOn0&e=>and at NOAANCEIocngeo
>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_NOAANCEIocngeo&d=DwMDaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=fsDk1eg5rM-so0h_XCTK_Pl1w5MGnQK88vuvHcbhUUI&s=GcsHw9fQDVUMabWDrGLrdXOZLmCJ5UWXcapPHOUcwdE&e=>./
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> CF-metadata mailing list
>>>>>>>>>> CF-metadata at cgd.ucar.edu <mailto:CF-metadata at cgd.ucar.edu>
>>>>>>>>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>>>>>>>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.cgd.ucar.edu_mailman_listinfo_cf-2Dmetadata&d=DwMFaQ&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=J2x5E3dUpn954rPN8-v-TFQOZiyobvfd2MaoRgJ8_Zg&s=7WZod_Yl4Ny2ikX4Vb__7Og8ciU0cQVZe4z5EPcKMe0&e=>
>>>>>>>>>
>>>>>>>>> --?
>>>>>>>>> Kenneth E. Kehoe
>>>>>>>>> ?? Research Associate - University of Oklahoma
>>>>>>>>> ?? Cooperative Institute for Mesoscale Meteorological Studies
>>>>>>>>> ?? ARM Climate Research Facility - Data Quality Office
>>>>>>>>> ?? e-mail:kkehoe at ou.edu <mailto:kkehoe at ou.edu>? | Office:
>>>>>>>>> 303-497-4754 | Cell: 405-826-0299
>>>>>>>>>
>>>>>>>>>
>>>>>>> --?
>>>>>>> Kenneth E. Kehoe
>>>>>
>>>>
>>>
>>> --
>>> Kenneth E. Kehoe
>>> Research Associate - University of Oklahoma
>>> Cooperative Institute for Mesoscale Meteorological Studies
>>> ARM Climate Research Facility - Data Quality Office
>>> e-mail: kkehoe at ou.edu | Office: 303-497-4754 | Cell: 405-826-0299
>>>
>>>
>>>
>>> _______________________________________________
>>> CF-metadata mailing list
>>> CF-metadata at cgd.ucar.edu
>>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
>> --
>> CICS-NC
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.cicsnc.org_&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=SaBBxyGBuy6lkUVH_EuJY5baSvDdbDNoGqe2fpRaliM&e=>
>> Visit us on
>> Facebook
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.facebook.com_cicsnc&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=7lLQ4fCHlUAWN8psp14-VgwOSY2IiN0r4Kh50C20mT4&e=>
>> *Jim Biard*
>> *Research Scholar*
>> Cooperative Institute for Climate and Satellites NC
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__cicsnc.org_&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=7mzcJQHmkKVtHgov54mbLXaziCOSUMNdCFEa39XIwWs&e=>
>>
>> North Carolina State University
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__ncsu.edu_&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=7bofCaniJhFchhy_1GiUkUY4KrXN_iaU2mOPg2sFNWU&e=>
>>
>> NOAA National Centers for Environmental Information
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__ncdc.noaa.gov_&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=16lCOOSR5-AjYBMHy5-dge0nJ5-gm2vMbzFqSO_NNDk&e=>
>>
>> /formerly NOAA?s National Climatic Data Center/
>> 151 Patton Ave, Asheville, NC 28801
>> e: jbiard at cicsnc.org <mailto:jbiard at cicsnc.org>
>> o: +1 828 271 4900
>>
>> /Connect with us on Facebook for climate
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.facebook.com_NOAANCEIclimate&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=oeOatfN2BKuh4ms86QmfVw89CUDEJ4uj0NPgGMsP_ow&e=>
>> and ocean and geophysics
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.facebook.com_NOAANCEIoceangeo&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=SRSk7uhqaCJfH2zkIfCSIb5MJ_Wy6wxvMM6tqEcVczY&e=>
>> information, and follow us on Twitter at _at_NOAANCEIclimate
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_NOAANCEIclimate&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=9ULgnR5cqxX3pG6S3tSf4wu2bnNBHFitd6ds_XstXkM&e=>
>> and _at_NOAANCEIocngeo
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_NOAANCEIocngeo&d=DwMD-g&c=qKdtBuuu6dQK9MsRUVJ2DPXW6oayO8fu4TfEHS8sGNk&r=Vm7o2ZGxPkkqRuPs8nVMVQ&m=e1MYci3o-HNkfDCrfJ0-fYxPPiiQGfUmnMu3Ubxz7Ng&s=RbvRlcDIp9Zt26hhEbwJZdXkE9EUfmD9fNhjH5snffE&e=>.
>> /
>>
>>
>>
>> _______________________________________________
>> CF-metadata mailing list
>> CF-metadata at cgd.ucar.edu
>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
> --
> Kenneth E. Kehoe
> Research Associate - University of Oklahoma
> Cooperative Institute for Mesoscale Meteorological Studies
> ARM Climate Research Facility - Data Quality Office
> e-mail: kkehoe at ou.edu | Office: 303-497-4754 | Cell: 405-826-0299
>
>
>
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
--
John Helly, University of California, San Diego / San Diego Supercomputer Center / Scripps Institution of Oceanography / 760 840 8660 mobile / http://www.sdsc.edu/~hellyj
ORCID ID: orcid.org/0000-0002-3779-0603
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