Hi again -
> Nice, thanks, Jim.
>
> My only suggestion, after a very quick read-through, is that we could
> put the definition of platform at the end of the variable's definition.
> That makes it much easier to scan these for the right term.
>
> Cheers - Nan
Or, maybe the definition of platform could come somewhere before the
definition
of starboard. Anywhere but at the start, unless there's a need for it to
be there that
I am missing.
Also, do the definitions of roll, pitch and yaw need to explicitly state
that these are
angles, or is it enough that that's in the canonical units for these
variables (and implied
by '"rotation about an axis")?
platform_roll_starboard_down: Roll is an angle of rotation about an axis
that is perpendicular to
the local vertical axis and is co-planar with the nominal forward motion
direction of a platform.
Roll is relative to the "at rest" rotation of the platform with respect
to the axis of rotation. The "at rest"
rotation of the platform may change over time. A 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. "Starboard down" indicates that
positive values of roll represent
the right side of the platform falling as viewed by an observer on top
of the platform facing forward.
Thanks - Nan
>
> Quoting Jim Biard <jbiard at cicsnc.org>:
>
>> Hi.
>>
>>
>> How about these definitions?
>>
>>
>> Jim
>>
>>
>> ==================
>>
>>
>> platform_roll_starboard_down: 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. Roll is a rotation about an axis that is perpendicular to
>> the local vertical axis and is coplanar with the nominal forward
>> motion direction of the platform. Roll is relative to the ?at rest?
>> rotation of the platform with respect to the axis of rotation. The
>> ?at rest? rotation of the platform may change over time. "Starboard
>> down" indicates that positive values of roll represent the right side
>> of the platform falling as viewed by an observer on top of the
>> platform facing forward.
>>
>> platform_roll_starboard_up: 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. Roll is a rotation about an axis that is perpendicular to
>> the local vertical axis and is coplanar with the nominal forward
>> motion direction of the platform. Roll is relative to the ?at rest?
>> rotation of the platform with respect to the axis of rotation. The
>> ?at rest? rotation of the platform may change over time. "Starboard
>> up" indicates that positive values of roll represent the right side
>> of the platform rising as viewed by an observer on top of the
>> platform facing forward.
>>
>> platform_roll_rate_starboard_down: 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. "Roll rate" is the rate of rotation about an
>> axis that is perpendicular to the local vertical axis and is coplanar
>> with the nominal forward motion direction of the platform. Roll rate
>> might not include changes to the ?at rest? rotation of the platform
>> with respect to the axis of rotation, which may change over time.
>> "Starboard down" indicates that positive values of roll rate
>> represent the right side of the platform falling as viewed by an
>> observer on top of the platform facing forward.
>>
>> platform_roll_rate_starboard_up: 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. "Roll rate" is the rate of rotation about an
>> axis that is perpendicular to the local vertical axis and is coplanar
>> with the nominal forward motion direction of the platform. Roll rate
>> might not include changes to the ?at rest? rotation of the platform
>> with respect to the axis of rotation, which may change over time.
>> "Starboard up" indicates that positive values of roll rate represent
>> the right side of the platform rising as viewed by an observer on top
>> of the platform facing forward.
>>
>> platform_pitch_fore_up: 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. Pitch is a rotation about an axis that is perpendicular to
>> both the local vertical axis and the nominal forward motion direction
>> of the platform. Pitch is relative to the ?at rest? rotation of the
>> platform with respect to the axis of rotation. The ?at rest? rotation
>> of the platform may change over time. "Fore up" indicates that
>> positive values of pitch represent the front of the platform rising
>> as viewed by an observer on top of the platform facing forward.
>>
>> platform_pitch_fore_down: 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. Pitch is a rotation about an axis that is perpendicular to
>> both the local vertical axis and the nominal forward motion direction
>> of the platform. Pitch is relative to the ?at rest? rotation of the
>> platform with respect to the axis of rotation. The ?at rest? rotation
>> of the platform may change over time. "Fore down" indicates that
>> positive values of pitch represent the front of the platform falling
>> as viewed by an observer on top of the platform facing forward.
>>
>> platform_pitch_rate_fore_up: 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. "Pitch rate" is the rate of rotation about an axis that is
>> perpendicular to both the local vertical axis and the nominal forward
>> motion direction of the platform. Pitch rate might not include
>> changes to the ?at rest? rotation of the platform with respect to the
>> axis of rotation, which may change over time. "Fore up" indicates
>> that positive values of pitch rate represent the front of the
>> platform rising as viewed by an observer on top of the platform
>> facing forward.
>>
>> platform_pitch_rate_fore_down: 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. "Pitch rate" is the rate of rotation about an
>> axis that is perpendicular to both the local vertical axis and the
>> nominal forward motion direction of the platform. Pitch rate might
>> not include changes to the ?at rest? rotation of the platform with
>> respect to the axis of rotation, which may change over time. "Fore
>> down" indicates that positive values of pitch rate represent the
>> front of the platform falling as viewed by an observer on top of the
>> platform facing forward.
>>
>> platform_yaw_fore_starboard: 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. Yaw is a rotation about the axis of rotation. Yaw is
>> relative to the ?at rest? rotation of the platform with respect to
>> the axis of rotation. The ?at rest? rotation of the platform may
>> change over time. "Fore starboard" indicates that positive values of
>> yaw represent the front of the platform moving to the right as viewed
>> by an observer on top of the platform facing forward.
>>
>> platform_yaw_fore_port: 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. Yaw is a rotation about the axis of rotation. Yaw is
>> relative to the ?at rest? rotation of the platform with respect to
>> the axis of rotation. The ?at rest? rotation of the platform may
>> change over time. "Fore port" indicates that positive values of yaw
>> represent the front of the platform moving to the left as viewed by
>> an observer on top of the platform facing forward.
>>
>> platform_yaw_rate_fore_starboard: 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. "Yaw rate" is the rate of rotation about the
>> axis of rotation. Yaw rate might not include changes to the ?at rest?
>> rotation of the platform with respect to the axis of rotation, which
>> may change over time. "Fore starboard" indicates that positive values
>> of yaw rate represent the front of the platform moving to the right
>> as viewed by an observer on top of the platform facing forward.
>>
>> platform_yaw_rate_fore_port: 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. "Yaw rate" is the rate of rotation about the axis of
>> rotation. Yaw rate might not include changes to the ?at rest?
>> rotation of the platform with respect to the axis of rotation, which
>> may change over time. "Fore port" indicates that positive values of
>> yaw rate represent the front of the platform moving to the left as
>> viewed by an observer on top of the platform facing forward.
>>
>> platform_surge_fore: 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. Surge is a displacement along an axis that is
>> perpendicular to the local vertical axis and is coplanar with the
>> nominal forward motion direction of the platform. Surge is relative
>> to the ?at rest? position of the platform with respect to the axis of
>> displacement. The ?at rest? position of the platform may change over
>> time. "Fore" indicates that positive values of surge represent the
>> platform moving forward as viewed by an observer on top of the
>> platform facing forward.
>>
>> platform_surge_aft: 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.
>> Surge is a displacement along an axis that is perpendicular to the
>> local vertical axis and is coplanar with the nominal forward motion
>> direction of the platform. Surge is relative to the ?at rest?
>> position of the platform with respect to the axis of displacement.
>> The ?at rest? position of the platform may change over time. "Aft"
>> indicates that positive values of surge represent the platform moving
>> backward as viewed by an observer on top of the platform facing forward.
>>
>> platform_surge_rate_fore: 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. "Surge rate" is the rate of displacement along an axis
>> that is perpendicular to the local vertical axis and is coplanar with
>> the nominal forward motion direction of the platform. Surge rate
>> might not include changes to the ?at rest? position of the platform
>> with respect to the axis of displacement, which may change over time.
>> "Fore" indicates that positive values of surge rate represent the
>> platform moving forward as viewed by an observer on top of the
>> platform facing forward.
>>
>> platform_surge_rate_aft: 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. "Surge rate" is the rate of displacement along an axis
>> that is perpendicular to the local vertical axis and is coplanar with
>> the nominal forward motion direction of the platform. Surge rate
>> might not include changes to the ?at rest? position of the platform
>> with respect to the axis of displacement, which may change over time.
>> "Aft" indicates that positive values of surge rate represent the
>> platform moving backward as viewed by an observer on top of the
>> platform facing forward.
>>
>> platform_sway_port: 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.
>> Sway is a displacement along an axis that is perpendicular to both
>> the local vertical axis and the nominal forward motion direction of
>> the platform. Sway is relative to the ?at rest? position of the
>> platform with respect to the axis of displacement. The ?at rest?
>> position of the platform may change over time. "Port" indicates that
>> positive values of sway represent the platform moving left as viewed
>> by an observer on top of the platform facing forward.
>>
>> platform_sway_starboard: 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. Sway is a displacement along an axis that is perpendicular
>> to both the local vertical axis and the nominal forward motion
>> direction of the platform. Sway is relative to the ?at rest? position
>> of the platform with respect to the axis of displacement. The ?at
>> rest? position of the platform may change over time. "Starboard"
>> indicates that positive values of sway represent the platform moving
>> right as viewed by an observer on top of the platform facing forward.
>>
>> platform_sway_rate_port: 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. "Sway rate" is the rate of displacement along an axis that
>> is perpendicular to both the local vertical axis and the nominal
>> forward motion direction of the platform. Sway rate may not include
>> changes to the ?at rest? position of the platform with respect to the
>> axis of displacement, which may change over time. "Port" indicates
>> that positive values of sway rate represent the platform moving left
>> as viewed by an observer on top of the platform facing forward.
>>
>> platform_sway_rate_starboard: 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. "Sway rate" is a displacement along an axis that is
>> perpendicular to both the local vertical axis and the nominal forward
>> motion direction of the platform. Sway rate may not include changes
>> to the ?at rest? position of the platform with respect to the axis of
>> displacement, which may change over time. "Starboard" indicates that
>> positive values of sway rate represent the platform moving right as
>> viewed by an observer on top of the platform facing forward.
>>
>> platform_heave_up: 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.
>> Heave is a displacement along the local vertical axis. Heave is
>> relative to the ?at rest? position of the platform with respect to
>> the axis of displacement. The ?at rest? position of the platform may
>> change over time. "Up" indicates that positive values of heave
>> represent the platform moving up as viewed by an observer on top of
>> the platform facing forward.
>>
>> platform_heave_down: 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. Heave is a displacement along the local vertical axis.
>> Heave is relative to the ?at rest? position of the platform with
>> respect to the axis of displacement. The ?at rest? position of the
>> platform may change over time. "Down" indicates that positive values
>> of heave represent the platform moving down as viewed by an observer
>> on top of the platform facing forward.
>>
>> platform_heave_rate_up: 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. "Heave rate" is the rate of displacement along the local
>> vertical axis. Heave rate may not include changes to the ?at rest?
>> position of the platform with respect to the axis of displacement,
>> which may change over time. "Up" indicates that positive values of
>> heave rate represent the platform moving up as viewed by an observer
>> on top of the platform facing forward.
>>
>> platform_heave_rate_down: 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. "Heave rate" is the rate of displacement along the local
>> vertical axis. Heave rate may not include changes to the ?at rest?
>> position of the platform with respect to the axis of displacement,
>> which may change over time. "Down" indicates that positive values of
>> heave rate represent the platform moving down as viewed by an
>> observer on top of the platform facing forward.
>>
>> platform_course: 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.
>> Course is the clockwise angle with respect to North of the nominal
>> forward motion direction of the platform.
>>
>> platform_orientation: 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. 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).
>>
>>
>> On 9/11/18 12:13 PM, Lowry, Roy K. wrote:
>>>
>>> Dear Nan and Jim,
>>>
>>>
>>> It was me, on my own volition,?who raised concerns about the use of
>>> nautical terms to try and make the concepts domain-independent.
>>> However,?'port' is such an elegant way of saying 'left when facing
>>> forward' that I don't think we should resist it. Saw a nice
>>> definition for port ?- 'The side of a platform?that is on the left
>>> when one is facing forward.'
>>>
>>>
>>> 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> on behalf of
>>> Jim Biard <jbiard at cicsnc.org>
>>> *Sent:* 11 September 2018 16:37
>>> *To:* cf-metadata at cgd.ucar.edu
>>> *Subject:* Re: [CF-metadata] Platform Heave
>>>
>>> Nan,
>>>
>>> That was my concern. As I have thought about it, we can make it
>>> clear in the definition text. I'll generate those later this week.
>>>
>>> Jim
>>>
>>>
>>> On 9/11/18 10:53 AM, Nan Galbraith wrote:
>>>> I agree completely. Thanks to all for keeping at it with this topic.
>>>>
>>>> ?* platform_roll_starboard_down
>>>> ?* platform_yaw_fore_starboard
>>>> ?* platform_pitch_fore_up
>>>> ?* platform_surge_fore
>>>> ?* platform_sway _port
>>>> ?* platform_heave_up
>>>>
>>>> There was some concern expressed about using port and starboard,
>>>> because
>>>> satellite folks don't normally use those terms. I was unable to
>>>> figure out exactly
>>>> who raised this point, the thread is long and sometimes my mail
>>>> client makes the
>>>> sender of each message a little obscure.
>>>>
>>>> I'm assuming even satellites have a 'front' - ADCPs don't, really,
>>>> except by some
>>>> obscure convention set by the vendors - so presumably people will
>>>> be able to figure
>>>> out which side is which, and these terms will be OK.
>>>>
>>>> - Nan
>>>>
>>>>
>>>> On 9/7/18 4:07 AM, Lowry, Roy K. wrote:
>>>>>
>>>>> Good point,
>>>>>
>>>>>
>>>>> So you'd prefer platform_roll_starboard_down and so on?
>>>>>
>>>>>
>>>>> Cheers, Roy.
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------
>>>>> *From:* John Graybeal <jbgraybeal at mindspring.com>
>>>>> <mailto:jbgraybeal at mindspring.com>
>>>>> *Sent:* 07 September 2018 03:29
>>>>> *Subject:* Re: [CF-metadata] Platform Heave
>>>>> Sorry if I missed a point, but joining the motion to platform_
>>>>> will be much more findable. Platform roll for example is a really
>>>>> common expression.
>>>>>
>>>>> John
>>>>>
>>>>> On Sep 6, 2018, at 08:22, 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 Jim,
>>>>>>
>>>>>>
>>>>>> Looking good to me.
>>>>>>
>>>>>>
>>>>>> Cheers, Roy.
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------
>>>>>> *From:* CF-metadata <cf-metadata-bounces at cgd.ucar.edu
>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>
>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>
>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>> on behalf of Jim Biard
>>>>>> <jbiard at cicsnc.org <mailto:jbiard at cicsnc.org>
>>>>>> <mailto:jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org>>
>>>>>> *Sent:* 05 September 2018 17:38
>>>>>> *Subject:* Re: [CF-metadata] Platform Heave
>>>>>>
>>>>>> Roy, Jonathan,
>>>>>>
>>>>>> I expect that surge, sway, and heave may well not have any
>>>>>> "alternate direction" representations in the wild, but I recall
>>>>>> that we found that the same is not true of pitch, roll, and yaw.
>>>>>>
>>>>>> Should we define the "canonical" set in such a fashion that the
>>>>>> sign convention is explicit and wait for people to request the
>>>>>> others?
>>>>>>
>>>>>> I guess that would be:
>>>>>>
>>>>>> ? * platform_starboard_down_roll
>>>>>> ? * platform_fore_starboard_yaw
>>>>>> ? * platform_fore_up_pitch
>>>>>> ? * platform_fore_surge
>>>>>> ? * platform_port_sway
>>>>>> ? * platform_up_heave
>>>>>>
>>>>>> Is that what we want?
>>>>>>
>>>>>> Grace and peace,
>>>>>>
>>>>>> Jim
>>>>>>
>>>>>> On 9/5/18 12:10 PM, Jonathan Gregory wrote:
>>>>>>>
>>>>>>> Dear Roy OK, yes. I agree with that too! We should not provide
>>>>>>> standard names for there is no use case yet. However, it's a
>>>>>>> good idea for foresee how this may be done, so that a neat
>>>>>>> solution is readily available when the day comes. Best wishes
>>>>>>> and thanks Jonathan On Wed, Sep 05, 2018 at 04:07:26PM +0000,
>>>>>>> Lowry, Roy K. wrote:
>>>>>>>>
>>>>>>>> Date: Wed, 5 Sep 2018 16:07:26 +0000 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> Subject: Re:
>>>>>>>> [CF-metadata] Platform Heave Dear Jonathan, This isn't a desire
>>>>>>>> to mandate, it's just an attempt to prevent the creation of six
>>>>>>>> unnecessary Standard Names for sign conventions based on my
>>>>>>>> knowledge and researches of oceanographic data that don't
>>>>>>>> exist. Should anybody come up with a single example of the
>>>>>>>> opposite sign convention in heave/sway/surge from any other
>>>>>>>> domain then the additional Standard Names will obviously need
>>>>>>>> setting up. Anybody know of any??? It also goes without saying
>>>>>>>> the 'normal' conventions should leave the door open - for
>>>>>>>> example 'upward heave' leaves the door open for a future
>>>>>>>> 'downward heave'. This follows another principle of CF Standard
>>>>>>>> Names which is that Standard Names should only set up when
>>>>>>>> there is a demonstrable use case and not just in case a use
>>>>>>>> case arises. Cheers, Roy. From: CF-metadata
>>>>>>>> <cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu> on behalf of Jonathan
>>>>>>>> Gregory <j.m.gregory at reading.ac.uk>
>>>>>>>> <mailto:j.m.gregory at reading.ac.uk>
>>>>>>>> <mailto:j.m.gregory at reading.ac.uk>
>>>>>>>> <mailto:j.m.gregory at reading.ac.uk> Sent: 05 September 2018 16:26
>>>>>>>> Subject: Re: [CF-metadata] Platform Heave Dear Jim and Roy In
>>>>>>>> general, we want CF to be able to describe the datasets that
>>>>>>>> users want to describe, rather than mandating particular
>>>>>>>> choices. Projects that use CF can do that, of course, like
>>>>>>>> CMIP6 does, which prescribes the standard_names of the
>>>>>>>> quantities to be submitted. Best wishes Jonathan
>>>>>>>>>
>>>>>>>>> Date: Wed, 5 Sep 2018 09:32:37 -0400 From: Jim Biard
>>>>>>>>> <jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org>
>>>>>>>>> <mailto:jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org> Subject:
>>>>>>>>> Re: [CF-metadata] Platform Heave
>>>>>>>>> Roy, Good point! However (of course there has to be a 'but'!),
>>>>>>>>> are we OK with forcing people to modify their data to match
>>>>>>>>> our convention? Are there other situations where a standard
>>>>>>>>> name requires a certain representation? The existing datasets
>>>>>>>>> that people have mentioned are history, but they are also
>>>>>>>>> indicative of different sign conventions out there "in the
>>>>>>>>> wild". Grace and peace, Jim On 9/5/18 4:22 AM, Lowry, Roy K.
>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>> Dear Jim, I think maybe you're doing more work than
>>>>>>>>>> necessary. I see the work falling into three parts. 1)
>>>>>>>>>> Revision of the definitions of heave/heave rate that are part
>>>>>>>>>> of a new Standard Name that has yet to be accepted. 2)
>>>>>>>>>> Creation of new Standard Names for Ken for sway/sway rate and
>>>>>>>>>> surge/surge rate 3) Upgrade to the definitions of the
>>>>>>>>>> existing Standard Names for pitch, roll and yaw. How about
>>>>>>>>>> hard-wiring direction conventions for cases (1) and (2) -
>>>>>>>>>> heave positive up, surge positive forwards and sway to match
>>>>>>>>>> Ken's data sets? As these are new Standard Names they cannot
>>>>>>>>>> be out in the wild with the opposite direction convention. We
>>>>>>>>>> would then need to deprecate the three existing Standard
>>>>>>>>>> Names and replace them with six new ones. One other thought
>>>>>>>>>> that is occupying my mind is whether the rate parameters are
>>>>>>>>>> scalars or vectors? Any thoughts? Cheers, Roy. *From:*
>>>>>>>>>> CF-metadata <cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu>
>>>>>>>>>> <mailto:cf-metadata-bounces at cgd.ucar.edu> on behalf of Jim
>>>>>>>>>> Biard <jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org>
>>>>>>>>>> <mailto:jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org> *Sent:*
>>>>>>>>>> 04 September 2018 16:36 *Subject:* Re: [CF-metadata] Platform
>>>>>>>>>> Heave Jonathan, Two out of three of Nan's "most intuitive"
>>>>>>>>>> rotations (pitch and yaw) are clockwise rather than
>>>>>>>>>> anticlockwise if the unit vectors are X-fore, Y-port, and
>>>>>>>>>> Z-up, which form a right-hand coordinate system. This is part
>>>>>>>>>> of why you will see examples where the unit vectors are
>>>>>>>>>> defined as X-fore, Y-starboard, and Z-down. This orientation
>>>>>>>>>> of the unit vectors makes yaw to starboard, pitch up, and
>>>>>>>>>> roll starboard down all anticlockwise rotations, but it
>>>>>>>>>> points the Z unit vector down, which is, for most people,
>>>>>>>>>> rather counter-intuitive. And this is why we are trying to
>>>>>>>>>> define things in terms that don't require specification of
>>>>>>>>>> unit vector directions. I'm going to try to continue down
>>>>>>>>>> that path and avoid calling out clockwise/anticlockwise.
>>>>>>>>>> Grace and peace, Jim On 9/4/18 10:18 AM, Jonathan Gregory wrote:
>>>>>>>>>>>
>>>>>>>>>>> Dear Jim
>>>>>>>>>>>>
>>>>>>>>>>>> If that's the general consensus, then we can go that
>>>>>>>>>>>> general direction. I'll prepare pairs of everything.
>>>>>>>>>>>
>>>>>>>>>>> Thank you for your flexibility.
>>>>>>>>>>>>
>>>>>>>>>>>> Regarding Nan's suggestions for names - I'm not a "ship
>>>>>>>>>>>> person" so starboard and port are unfamiliar terms that I
>>>>>>>>>>>> have to constantly check myself on. I dislike putting them
>>>>>>>>>>>> in the names. I don't see them in regular use in the
>>>>>>>>>>>> satellite domain. The same goes for bow as far as usage
>>>>>>>>>>>> outside of the ship domain. Airplanes have noses.
>>>>>>>>>>>> Satellites have ... I don't know if there is even a name,
>>>>>>>>>>>> as there is no need for a leading edge. I'll struggle to
>>>>>>>>>>>> find something, and then we can wrangle over it.
>>>>>>>>>>>
>>>>>>>>>>> I agree with you - it would be better to have something
>>>>>>>>>>> generic and self- explanatory, even if it diverges from
>>>>>>>>>>> familiar terminology.
>>>>>>>>>>>>
>>>>>>>>>>>> I think the "most intuitive" way to represent the angles -
>>>>>>>>>>>> and most consistent as well, in my view - is clockwise
>>>>>>>>>>>> rotations around the unit vectors. This makes positive yaw
>>>>>>>>>>>> to starboard, positive pitch nose up, and positive roll
>>>>>>>>>>>> starboard up. But we are talking about having both signs
>>>>>>>>>>>> represented in names, so I guess that is moot.
>>>>>>>>>>>
>>>>>>>>>>> I agree with this too. For describing polygonal bounds, we
>>>>>>>>>>> say that the vertices should be traversed anticlockwise as
>>>>>>>>>>> seen from above. That is a positive direction of rotation
>>>>>>>>>>> around the vertical axis, since longitude- latitude-upward
>>>>>>>>>>> is a right-handed coordinate system. I suppose this is the
>>>>>>>>>>> yaw rotation - but is that the opposite sign from yours?
>>>>>>>>>>> Best wishes Jonathan
>>>>>>>>>>>>
>>>>>>>>>>>> On 9/3/18 12:51 PM, Jonathan Gregory wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Dear Roy and Nan I agree that if there are existing names
>>>>>>>>>>>>> whose sign convention is undefined we can't
>>>>>>>>>>>>> retrospectively define it. I think those ones ought to be
>>>>>>>>>>>>> deprecated, though, in favour of new ones with signs
>>>>>>>>>>>>> indicated. Best wishes Jonathan ----- Forwarded message
>>>>>>>>>>>>> from Nan Galbraith<ngalbraith at whoi.edu>
>>>>>>>>>>>>> <mailto:ngalbraith at whoi.edu> <mailto:ngalbraith at whoi.edu>
>>>>>>>>>>>>> <mailto:ngalbraith at whoi.edu>-----
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Date: Sun, 02 Sep 2018 11:57:33 -0400
>>>>>>>>>>>>> From: Nan Galbraith<ngalbraith at whoi.edu>
>>>>>>>>>>>>> <mailto:ngalbraith at whoi.edu> <mailto:ngalbraith at whoi.edu>
>>>>>>>>>>>>> <mailto:ngalbraith at whoi.edu>
>>>>>>>>>>>>>> ?I second Roy's suggestion; existing names have undefined
>>>>>>>>>>>>>> directionality, and new names have explicit directions.
>>>>>>>>>>>>>> This seems like the only way to move forward. If there's
>>>>>>>>>>>>>> a difference of opinion on which direction should be in
>>>>>>>>>>>>>> the new name, we can easily create a pair for each term.
>>>>>>>>>>>>>> What would the explicit names be? Some of the terms in
>>>>>>>>>>>>>> the thread below use 'right' and 'left' where 'port' and
>>>>>>>>>>>>>> 'starboard' might be more clear, since, as Roy points
>>>>>>>>>>>>>> out, left and right can be taken as 'looking forwards
>>>>>>>>>>>>>> from the platform or looking at the front of the
>>>>>>>>>>>>>> platform.' I also agree that these are the most intuitive
>>>>>>>>>>>>>> way to represent these angles/motions:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> heave positive up pitch positive bow up yaw positive to
>>>>>>>>>>>>>>> starboard roll positive starboard side down
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Would the names be something like heave_up, pitch_bow_up,
>>>>>>>>>>>>>> yaw_to_starboard, and roll_to_starboard? We do need to
>>>>>>>>>>>>>> differentiate these from the exiting names. Regards - Nan
>>>>>>>>>>>>>> Quoting "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> <mailto:rkl at bodc.ac.uk>
>>>>>>>>>>>>>> <mailto:rkl at bodc.ac.uk> <mailto:rkl at bodc.ac.uk>
>>>>>>>>>>>>>> <mailto:rkl at bodc.ac.uk>:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Dear Jim, From my researches into existing oceanographic
>>>>>>>>>>>>>>> data sets (SeaDataCloud holdings plus EU glider data
>>>>>>>>>>>>>>> projects), covering heave, pitch, roll and yaw. I
>>>>>>>>>>>>>>> haven't discovered a single deviation from the conventions:
>>>>>>>>>>>>>>> heave positive up Pitch positive bow/nose up yaw
>>>>>>>>>>>>>>> positive to starboard roll starboard side down I have
>>>>>>>>>>>>>>> yet to find any data sets, other than those described by
>>>>>>>>>>>>>>> Ken in these discussions, in my searches containing
>>>>>>>>>>>>>>> surge or sway. The only ambiguity I have found in the
>>>>>>>>>>>>>>> wider domain of Google is where the concept of 'positive
>>>>>>>>>>>>>>> clockwise' has been used without specifying whether the
>>>>>>>>>>>>>>> observer is looking forwards from the platform or
>>>>>>>>>>>>>>> looking at the front of the platform. This isn't helped
>>>>>>>>>>>>>>> by the multitude of bidirectional vectors (arrows at
>>>>>>>>>>>>>>> each end) in illustrative diagrams. Might our lives be
>>>>>>>>>>>>>>> made easier if we adopted a set of conventions, state
>>>>>>>>>>>>>>> them explicitly in the Standard Names as Jonathan
>>>>>>>>>>>>>>> suggests leaving room in the unlikely - in my view at
>>>>>>>>>>>>>>> least - event of Standard Names for the opposite
>>>>>>>>>>>>>>> convention being required? Cheers, Roy. From:
>>>>>>>>>>>>>>> CF-metadata on behalf of Jim Biard<jbiard at cicsnc.org>
>>>>>>>>>>>>>>> <mailto:jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org>
>>>>>>>>>>>>>>> <mailto:jbiard at cicsnc.org>
>>>>>>>>>>>>>>> Sent: 31 August 2018 14:38 ?Jonathan, That's only part
>>>>>>>>>>>>>>> of the issue. Here are the issues as I see them. * There
>>>>>>>>>>>>>>> is no single sign convention being followed in existing
>>>>>>>>>>>>>>> datasets "in the wild". * There is a long-standing
>>>>>>>>>>>>>>> convention for vertical coordinates using the attribute
>>>>>>>>>>>>>>> positive rather than having pairs of standard names for
>>>>>>>>>>>>>>> height_positive_up, height_positive_down, etc. The
>>>>>>>>>>>>>>> suggested solution is corollary, and the positive
>>>>>>>>>>>>>>> attribute could be used instead of adding a new
>>>>>>>>>>>>>>> attribute named direction with a suitable expansion of
>>>>>>>>>>>>>>> possible valid values. * In order to cover all bases,
>>>>>>>>>>>>>>> we'd need three versions for each standard name (e.g. -
>>>>>>>>>>>>>>> platform_roll, platform_roll_clockwise,
>>>>>>>>>>>>>>> platform_roll_anticlockwise - or similar names) * Having
>>>>>>>>>>>>>>> three different versions of each standard name will lead
>>>>>>>>>>>>>>> to new possibilities for getting things wrong by picking
>>>>>>>>>>>>>>> the wrong version. * Semantically, there is only one
>>>>>>>>>>>>>>> concept in each case. If I am searching for roll
>>>>>>>>>>>>>>> variables and I have multiple names that mean roll, I
>>>>>>>>>>>>>>> must expand my search to include all variants. This is a
>>>>>>>>>>>>>>> small example, but there are other examples of this
>>>>>>>>>>>>>>> problem that are definitely not trivial and defeat one
>>>>>>>>>>>>>>> of the goals for using standard names - being able to
>>>>>>>>>>>>>>> find like quantities across datasets, particularly using
>>>>>>>>>>>>>>> automated techniques rather than human eyes. Grace and
>>>>>>>>>>>>>>> peace, Jim On 8/31/18 8:52 AM, Jonathan Gregory wrote:
>>>>>>>>>>>>>>> Dear all I haven't been following this discussion, so
>>>>>>>>>>>>>>> please excuse me if I've missed the point. I think you
>>>>>>>>>>>>>>> are suggesting introducing a new attribute to indicate
>>>>>>>>>>>>>>> the positive sense of various new quantities for
>>>>>>>>>>>>>>> platform orientation - is that right? To do that would
>>>>>>>>>>>>>>> not be consistent with other standard names, which
>>>>>>>>>>>>>>> (where relevant) all have the positive sense indicate in
>>>>>>>>>>>>>>> the standard name itself. That's why there are many
>>>>>>>>>>>>>>> pairs of standard names for upward/downward, in
>>>>>>>>>>>>>>> particular. The reason for doing this is to make it
>>>>>>>>>>>>>>> impossible to name the quantity without indicating its
>>>>>>>>>>>>>>> sign convention, whereas a separate attribute can be
>>>>>>>>>>>>>>> omitted, and probably sometimes will. It also opens new
>>>>>>>>>>>>>>> possibilities for getting things wrong, by putting
>>>>>>>>>>>>>>> illegal values in it. Therefore I would argue for the
>>>>>>>>>>>>>>> same approach here, both because I think it's less
>>>>>>>>>>>>>>> error-prone, and for consistency with other CF standard
>>>>>>>>>>>>>>> names. I'm sure the objection occurs to you that this
>>>>>>>>>>>>>>> means more standard names. That's true, but it's only
>>>>>>>>>>>>>>> twice as many, I believe, since each of the quantities
>>>>>>>>>>>>>>> has only two possible senses.
>>>>>>>>>>>>>> Best wishes Jonathan
>>>>>>>>>>>>>>> ----- Forwarded message from Kenneth Kehoe
>>>>>>>>>>>>>>> <kkehoe at ou.edu> <mailto:kkehoe at ou.edu>
>>>>>>>>>>>>>>> <mailto:kkehoe at ou.edu> <mailto:kkehoe at ou.edu>
>>>>>>>>>>>>>>> <mailto:kkehoe at ou.edu> <mailto:kkehoe at ou.edu>
>>>>>>>>>>>>>>> <mailto:kkehoe at ou.edu> <mailto:kkehoe at ou.edu>
>>>>>>>>>>>>>>> Date: Thu, 30 Aug 2018 12:05:44 -0600
>>>>>>>>>>>>>>> From: Kenneth Kehoe<kkehoe at ou.edu>
>>>>>>>>>>>>>>> <mailto:kkehoe at ou.edu> <mailto:kkehoe at ou.edu>
>>>>>>>>>>>>>>> <mailto:kkehoe at ou.edu>
>>>>>>>>>>>>>>> Subject: Re: [CF-metadata] Platform Heave
>>>>>>>>>>>>>>> I think we should keep things simple as Ethan suggests
>>>>>>>>>>>>>>> below. But since the proposed attribute "direction" is
>>>>>>>>>>>>>>> defined as indicating the positive direction we don't
>>>>>>>>>>>>>>> need to include the word positive. The terms would then
>>>>>>>>>>>>>>> be: roll: "right_side_up" and "right_side_down" pitch:
>>>>>>>>>>>>>>> "nose_up" and "nose_down" yaw: "nose_right" and
>>>>>>>>>>>>>>> "nose_left" surge: "forward" and "backward" sway: "left"
>>>>>>>>>>>>>>> and "right" heave: "up" and "down" It would be nice to
>>>>>>>>>>>>>>> be more explicit in the netCDF file and require less on
>>>>>>>>>>>>>>> the standard_name definition so I would suggest we use
>>>>>>>>>>>>>>> the original proposed attribute name of
>>>>>>>>>>>>>>> "positive_direction" with the above allowed values. Or
>>>>>>>>>>>>>>> if we don't want to add a new attribute we could use the
>>>>>>>>>>>>>>> existing "positive" attribute and expand its allowed
>>>>>>>>>>>>>>> use. I've proposed this in the past and it was decided
>>>>>>>>>>>>>>> to not expand the definition. I think the concern for
>>>>>>>>>>>>>>> not expanding positive was the requirement of only using
>>>>>>>>>>>>>>> that attribute on coordinate variables. For the
>>>>>>>>>>>>>>> coordinate variable the only allowable values are up and
>>>>>>>>>>>>>>> down. But for this use those values would only be
>>>>>>>>>>>>>>> attached to a variable, not a coordinate variable. Since
>>>>>>>>>>>>>>> we are creating an attribute to define the positive
>>>>>>>>>>>>>>> direction I would like to add radial definition of
>>>>>>>>>>>>>>> "toward" and "away". But I think we can simplify this a
>>>>>>>>>>>>>>> bit further. If we define the point of reference that is
>>>>>>>>>>>>>>> moving in the standard name then we don't need to put
>>>>>>>>>>>>>>> the point of reference in the positive (or direction or
>>>>>>>>>>>>>>> positive_direction) attribute. For example the pitch
>>>>>>>>>>>>>>> standard_name would indicate the location of reference
>>>>>>>>>>>>>>> of the nose. This would then reduce the list of possible
>>>>>>>>>>>>>>> options to: roll: "up" and "down" pitch: "up" and "down"
>>>>>>>>>>>>>>> yaw: "right" and "left" surge: "forward" and "backward"
>>>>>>>>>>>>>>> sway: "left" and "right" heave: "up" and "down" If we
>>>>>>>>>>>>>>> could use the current attribute of "positive" that has
>>>>>>>>>>>>>>> up and down already defined then we only need to to add
>>>>>>>>>>>>>>> "right", "left", "forward", "backward", "toward",
>>>>>>>>>>>>>>> "away". Easy! Ken On 2018-8-29 13:54, Ethan Davis wrote:
>>>>>>>>>>>>>>> Hey Jim, How about removing one layer of terminology by
>>>>>>>>>>>>>>> using your definitions for the allowed values of
>>>>>>>>>>>>>>> "direction": roll: "positive_right_side_up" and
>>>>>>>>>>>>>>> "positive_right_side_down". pitch: "positive_nose_up"
>>>>>>>>>>>>>>> and "positive_nose_down". yaw: "positive_nose_right" and
>>>>>>>>>>>>>>> "positive_nose_left". surge: "positive_forward" and
>>>>>>>>>>>>>>> "positive_backward". sway: "positive_left" and
>>>>>>>>>>>>>>> "positive_right". heave: "positive_up" and
>>>>>>>>>>>>>>> "positive_down". Cheers, Ethan On Wed, Aug 29, 2018 at
>>>>>>>>>>>>>>> 12:02 PM Jim Biard <jbiard at cicsnc.org
>>>>>>>>>>>>>>> <mailto:jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org>
>>>>>>>>>>>>>>> <mailto:jbiard at cicsnc.org>>wrote: John, There are a
>>>>>>>>>>>>>>> variety of conventions for defining roll, pitch, and yaw
>>>>>>>>>>>>>>> out there. This is why we are avoiding a specific one.
>>>>>>>>>>>>>>> Others have searched existing datasets that are using
>>>>>>>>>>>>>>> earlier versions of these standard names (or not using
>>>>>>>>>>>>>>> standard names) and found that they don't all follow the
>>>>>>>>>>>>>>> same convention. Ethan, We purposely aren't answering
>>>>>>>>>>>>>>> that question directly because of the issue above. I
>>>>>>>>>>>>>>> believe that I have consistently followed the convention
>>>>>>>>>>>>>>> in which clockwise and anticlockwise are rotational
>>>>>>>>>>>>>>> directions around a unit vector facing the observer,
>>>>>>>>>>>>>>> where the X unit vector is in the nominally forward
>>>>>>>>>>>>>>> direction, the Z axis is in the local up direction, and
>>>>>>>>>>>>>>> the Y axis unit vector is "Z cross X", which forms a
>>>>>>>>>>>>>>> right-handed coordinate system. The terms are meaningful
>>>>>>>>>>>>>>> and accurate using that convention, but the names could
>>>>>>>>>>>>>>> be "alpha" and "beta" or "dog" and "cat" as long as they
>>>>>>>>>>>>>>> are used correctly. This whole topic is fraught with
>>>>>>>>>>>>>>> competing conventions, so we are attempting to avoid
>>>>>>>>>>>>>>> declaring that only one of them is valid, with it's
>>>>>>>>>>>>>>> corresponding requirement that everyone follow that one
>>>>>>>>>>>>>>> sign convention. In fact, we could reword things to
>>>>>>>>>>>>>>> remove naming the axes X, Y, and Z, and perhaps we
>>>>>>>>>>>>>>> should. I know of satellite platforms that define their
>>>>>>>>>>>>>>> Y axis unit vector as pointing forward and the Z axis
>>>>>>>>>>>>>>> unit vector as pointing down. Thoughts? Grace and peace,
>>>>>>>>>>>>>>> Jim On 8/29/18 1:32 PM, John Helly wrote: Perhaps one
>>>>>>>>>>>>>>> should refer to the discipline of hydrostatics for help
>>>>>>>>>>>>>>> with this? This paper, pulled from a quick search, has a
>>>>>>>>>>>>>>> diagram referencing the platforms' frame of reference
>>>>>>>>>>>>>>> with respect to its center of gravity. Sorry if this
>>>>>>>>>>>>>>> comment is retrograd...
>>>>>>>>>>>>>>> J. On 8/29/18 10:09, Ethan Davis wrote: Hi Jim, all, I'm
>>>>>>>>>>>>>>> a bit confused by the "clockwise" and "anticlockwise".
>>>>>>>>>>>>>>> You mention the orientation of the observer but not the
>>>>>>>>>>>>>>> location/orientation of the clock. My assumptions (not
>>>>>>>>>>>>>>> sure why) for the clock: for roll, the observer (who is
>>>>>>>>>>>>>>> facing forward) would be facing the clock; for pitch,
>>>>>>>>>>>>>>> the observer would look right to see the clock; and for
>>>>>>>>>>>>>>> yaw, the observer would look down to see the clock. That
>>>>>>>>>>>>>>> works for your definitions of pitch and yaw, but is
>>>>>>>>>>>>>>> backwards for roll. Does "clockwise" add, in some way,
>>>>>>>>>>>>>>> another degree of freedom to the definition? Does that
>>>>>>>>>>>>>>> degree of freedom need to be nailed down in the
>>>>>>>>>>>>>>> definitions? Or other terms used instead? I don't have
>>>>>>>>>>>>>>> any good suggestions other than "positive" and
>>>>>>>>>>>>>>> "negative". Cheers, Ethan On Wed, Aug 29, 2018 at 9:03
>>>>>>>>>>>>>>> AM Jim Biard<jbiard at cicsnc.org>
>>>>>>>>>>>>>>> <mailto:jbiard at cicsnc.org> <mailto:jbiard at cicsnc.org>
>>>>>>>>>>>>>>> <mailto:jbiard at cicsnc.org> wrote: Hi. I've finally
>>>>>>>>>>>>>>> gotten back to this topic! The definitions below call
>>>>>>>>>>>>>>> out an attribute named "direction" that is used to
>>>>>>>>>>>>>>> specify the direction for positive values of the
>>>>>>>>>>>>>>> different quantities. We may need to add a definition
>>>>>>>>>>>>>>> for the attribute to the Conventions. The values and
>>>>>>>>>>>>>>> meanings for the direction attribute are: 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. And here
>>>>>>>>>>>>>>> are the standard name definitions: platform_roll:
>>>>>>>>>>>>>>> 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. 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 of the platform. Roll is
>>>>>>>>>>>>>>> relative to the ?at rest? rotation of the platform with
>>>>>>>>>>>>>>> respect to the X axis. The ?at rest? rotation of the
>>>>>>>>>>>>>>> platform may change over time. The direction for
>>>>>>>>>>>>>>> positive values of roll is specified by an attribute
>>>>>>>>>>>>>>> named direction. The value of the direction attribute is
>>>>>>>>>>>>>>> "clockwise" if positive values of roll represent the
>>>>>>>>>>>>>>> right side of the platform rising as viewed by an
>>>>>>>>>>>>>>> observer on top of the platform facing forward. The
>>>>>>>>>>>>>>> value of the direction attribute is "anticlockwise" if
>>>>>>>>>>>>>>> positive values of roll represent the right side of the
>>>>>>>>>>>>>>> platform falling. The directionality of roll values is
>>>>>>>>>>>>>>> unspecified if no direction attribute is present.
>>>>>>>>>>>>>>> platform_pitch: 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. 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 of the
>>>>>>>>>>>>>>> platform. Pitch is relative to the ?at rest? rotation of
>>>>>>>>>>>>>>> the platform with respect to the Y axis. The ?at rest?
>>>>>>>>>>>>>>> rotation of the platform may change over time. The
>>>>>>>>>>>>>>> direction for positive values of pitch is specified by
>>>>>>>>>>>>>>> an attribute named direction. The value of the direction
>>>>>>>>>>>>>>> attribute is "clockwise" if positive values of pitch
>>>>>>>>>>>>>>> represent the front of the platform rising as viewed by
>>>>>>>>>>>>>>> an observer on top of the platform facing forward. The
>>>>>>>>>>>>>>> value of the direction attribute is "anticlockwise" if
>>>>>>>>>>>>>>> positive values of pitch represent the front of the
>>>>>>>>>>>>>>> platform falling. The directionality of pitch values is
>>>>>>>>>>>>>>> unspecified if no direction attribute is present.
>>>>>>>>>>>>>>> platform_yaw: 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. Yaw is a
>>>>>>>>>>>>>>> rotation about the local vertical axis (the Z axis). Yaw
>>>>>>>>>>>>>>> is relative to the ?at rest? rotation of the platform
>>>>>>>>>>>>>>> with respect to the Z axis. The ?at rest? rotation of
>>>>>>>>>>>>>>> the platform may change over time. The direction for
>>>>>>>>>>>>>>> positive values of yaw is specified by an attribute
>>>>>>>>>>>>>>> named direction. The value of the direction attribute is
>>>>>>>>>>>>>>> "clockwise" if positive values of yaw represent the
>>>>>>>>>>>>>>> front of the platform moving to the right as viewed by
>>>>>>>>>>>>>>> an observer on top of the platform facing forward. The
>>>>>>>>>>>>>>> value of the direction attribute is "anticlockwise" if
>>>>>>>>>>>>>>> positive values of yaw represent the front of the
>>>>>>>>>>>>>>> platform moving to the left. The directionality of yaw
>>>>>>>>>>>>>>> values is unspecified if no direction attribute is
>>>>>>>>>>>>>>> present. platform_surge: 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.
>>>>>>>>>>>>>>> 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 of the platform. Surge is 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. The direction for positive values of surge is
>>>>>>>>>>>>>>> specified by an attribute named direction. The value of
>>>>>>>>>>>>>>> the direction attribute is "positive" if positive values
>>>>>>>>>>>>>>> of surge represent the platform moving forward as viewed
>>>>>>>>>>>>>>> by an observer on top of the platform facing forward.
>>>>>>>>>>>>>>> The value of the direction attribute is "negative" if
>>>>>>>>>>>>>>> positive values of surge represent the platform moving
>>>>>>>>>>>>>>> backward. The directionality of surge values is
>>>>>>>>>>>>>>> unspecified if no direction attribute is present.
>>>>>>>>>>>>>>> platform_sway: 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. 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 of the
>>>>>>>>>>>>>>> platform. Sway is 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. The
>>>>>>>>>>>>>>> direction for positive values of sway is specified by an
>>>>>>>>>>>>>>> attribute named direction. The value of the direction
>>>>>>>>>>>>>>> attribute is "positive" if positive values of sway
>>>>>>>>>>>>>>> represent the platform moving left as viewed by an
>>>>>>>>>>>>>>> observer on top of the platform facing forward. The
>>>>>>>>>>>>>>> value of the direction attribute is "negative" if
>>>>>>>>>>>>>>> positive values of sway represent the platform moving
>>>>>>>>>>>>>>> right. The directionality of sway values is unspecified
>>>>>>>>>>>>>>> if no direction attribute is present. platform_heave:
>>>>>>>>>>>>>>> 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. Heave is a displacement along the
>>>>>>>>>>>>>>> local vertical axis (the Z axis). Heave is 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. The direction for positive values of
>>>>>>>>>>>>>>> heave is specified by an attribute named direction. The
>>>>>>>>>>>>>>> value of the direction attribute is "positive" if
>>>>>>>>>>>>>>> positive values of heave represent the platform moving
>>>>>>>>>>>>>>> up as viewed by an observer on top of the platform
>>>>>>>>>>>>>>> facing forward. The value of the direction attribute is
>>>>>>>>>>>>>>> "negative" if positive values of heave represent the
>>>>>>>>>>>>>>> platform moving down. The directionality of heave values
>>>>>>>>>>>>>>> is unspecified if no direction attribute is present.
>>>>>>>>>>>>>>> platform_course: 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. Course is the
>>>>>>>>>>>>>>> clockwise angle with respect to North of the nominal
>>>>>>>>>>>>>>> forward motion direction of the platform.
>>>>>>>>>>>>>>> platform_orientation: 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. 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). platform_roll_rate: 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. Roll rate is the rate of 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 of the platform. Roll
>>>>>>>>>>>>>>> rate might not include changes in the ?at rest? rotation
>>>>>>>>>>>>>>> of the platform, which may change over time. The
>>>>>>>>>>>>>>> direction for positive values of roll rate is specified
>>>>>>>>>>>>>>> by an attribute named direction. The value of the
>>>>>>>>>>>>>>> direction attribute is "clockwise" if positive values of
>>>>>>>>>>>>>>> roll rate represent the right side of the platform
>>>>>>>>>>>>>>> rising as viewed by an observer on top of the platform
>>>>>>>>>>>>>>> facing forward. The value of the direction attribute is
>>>>>>>>>>>>>>> "anticlockwise" if positive values of roll rate
>>>>>>>>>>>>>>> represent the right side of the platform falling. The
>>>>>>>>>>>>>>> directionality of roll rate values is unspecified if no
>>>>>>>>>>>>>>> direction attribute is present. platform_pitch_rate:
>>>>>>>>>>>>>>> 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. Pitch rate is the rate of 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 of the platform. Pitch rate
>>>>>>>>>>>>>>> might not include changes in the ?at rest? rotation of
>>>>>>>>>>>>>>> the platform, which may change over time. The direction
>>>>>>>>>>>>>>> for positive values of pitch rate is specified by an
>>>>>>>>>>>>>>> attribute named direction. The value of the direction
>>>>>>>>>>>>>>> attribute is "clockwise" if positive values of pitch
>>>>>>>>>>>>>>> rate represent the front of the platform rising as
>>>>>>>>>>>>>>> viewed by an observer on top of the platform facing
>>>>>>>>>>>>>>> forward. The value of the direction attribute is
>>>>>>>>>>>>>>> "anticlockwise" if positive values of pitch rate
>>>>>>>>>>>>>>> represent the front of the platform falling. The
>>>>>>>>>>>>>>> directionality of pitch rate values is unspecified if no
>>>>>>>>>>>>>>> direction attribute is present. platform_yaw_rate:
>>>>>>>>>>>>>>> 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. Yaw rate is the rate of rotation
>>>>>>>>>>>>>>> about the local vertical axis (the Z axis). Yaw rate
>>>>>>>>>>>>>>> might not include changes in the ?at rest? rotation of
>>>>>>>>>>>>>>> the platform, which may change over time. The direction
>>>>>>>>>>>>>>> for positive values of yaw rate is specified by an
>>>>>>>>>>>>>>> attribute named direction. The value of the direction
>>>>>>>>>>>>>>> attribute is "clockwise" if positive values of yaw rate
>>>>>>>>>>>>>>> represent the front of the platform moving to the right
>>>>>>>>>>>>>>> as viewed by an observer on top of the platform facing
>>>>>>>>>>>>>>> forward. The value of the direction attribute is
>>>>>>>>>>>>>>> "anticlockwise" if positive values of yaw rate represent
>>>>>>>>>>>>>>> the front of the platform moving to the left. The
>>>>>>>>>>>>>>> directionality of yaw rate values is unspecified if no
>>>>>>>>>>>>>>> direction attribute is present. platform_surge_rate:
>>>>>>>>>>>>>>> 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. Surge rate is the rate of
>>>>>>>>>>>>>>> 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 of the platform. Surge rate might not include
>>>>>>>>>>>>>>> changes in the ?at rest? position of the platform, which
>>>>>>>>>>>>>>> may change over time. The direction for positive values
>>>>>>>>>>>>>>> of surge rate is specified by an attribute named
>>>>>>>>>>>>>>> direction. The value of the direction attribute is
>>>>>>>>>>>>>>> "positive" if positive values of surge rate represent
>>>>>>>>>>>>>>> the platform moving forward as viewed by an observer on
>>>>>>>>>>>>>>> top of the platform facing forward. The value of the
>>>>>>>>>>>>>>> direction attribute is "negative" if positive values of
>>>>>>>>>>>>>>> surge rate represent the platform moving backward. The
>>>>>>>>>>>>>>> directionality of surge rate values is unspecified if no
>>>>>>>>>>>>>>> direction attribute is present. platform_sway_rate:
>>>>>>>>>>>>>>> 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. Sway rate is the rate of
>>>>>>>>>>>>>>> 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 of the
>>>>>>>>>>>>>>> platform. Sway rate might not include changes in the ?at
>>>>>>>>>>>>>>> rest? position of the platform, which may change over
>>>>>>>>>>>>>>> time. The direction for positive values of sway rate is
>>>>>>>>>>>>>>> specified by an attribute named direction. The value of
>>>>>>>>>>>>>>> the direction attribute is "positive" if positive values
>>>>>>>>>>>>>>> of sway rate represent the platform moving left as
>>>>>>>>>>>>>>> viewed by an observer on top of the platform facing
>>>>>>>>>>>>>>> forward. The value of the direction attribute is
>>>>>>>>>>>>>>> "negative" if positive values of sway rate represent the
>>>>>>>>>>>>>>> platform moving right. The directionality of sway rate
>>>>>>>>>>>>>>> values is unspecified if no direction attribute is
>>>>>>>>>>>>>>> present. platform_heave_rate: 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.
>>>>>>>>>>>>>>> Heave rate is the rate of displacement along the local
>>>>>>>>>>>>>>> vertical axis (the Z axis). Heave rate might not include
>>>>>>>>>>>>>>> changes in the ?at rest? position of the platform, which
>>>>>>>>>>>>>>> may change over time. The direction for positive values
>>>>>>>>>>>>>>> of heave rate is specified by an attribute named
>>>>>>>>>>>>>>> direction. The value of the direction attribute is
>>>>>>>>>>>>>>> "positive" if positive values of heave rate represent
>>>>>>>>>>>>>>> the platform moving up as viewed by an observer on top
>>>>>>>>>>>>>>> of the platform facing forward. The value of the
>>>>>>>>>>>>>>> direction attribute is "negative" if positive values of
>>>>>>>>>>>>>>> heave rate represent the platform moving down. The
>>>>>>>>>>>>>>> directionality of heave rate values is unspecified if no
>>>>>>>>>>>>>>> direction attribute is present. Grace and peace, Jim
>>>>>>>>>>>>>>>
>>>>
>>>
--
*******************************************************
* Nan Galbraith Information Systems Specialist *
* Upper Ocean Processes Group Mail Stop 29 *
* Woods Hole Oceanographic Institution *
* Woods Hole, MA 02543 (508) 289-2444 *
*******************************************************
Received on Wed Sep 12 2018 - 09:13:52 BST
