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.
>
>
> I am retiring on 31/05/2018 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
> Hamilton, Steve <sj.hamilton at fugro.com>
> *Sent:* 25 May 2018 08:51
> *To:* cf-metadata at cgd.ucar.edu
> *Subject:* Re: [CF-metadata] Platform Heave
>
> All,
>
> Thanks for all the comments, I have tried to capture as below -
>
> *Parameter Name***
>
>
>
> *Standard Name*
>
>
>
> *Definition*
>
>
>
> *Canonical Units*
>
> ???????? Platform Heave
>
>
>
> Platform_Height_above_mean_sea_Level
>
>
>
> ??????? Standard names for platform describe the motion and
> orientation of the vehicle from which observations are made e.g.
> aeroplane, ship or satellite.? Height above mean sea Level is the
> linear vertical (up/down) distance of the platform in respect to the
> mean sea level.
>
>
>
> ??????? m
>
> ?????? Platform Heave Rate
>
>
>
> Tendency_of_Platform_Height_above_mean_sea_Level
>
>
>
> ??????? 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. Height above mean sea Level is the linear
> vertical (up/down) distance of the platform in respect to the mean sea
> level.
>
>
>
> ??????? m s-1
>
> Please let me know if you have further comments
>
> Thanks
>
> Steve
>
> *From:*Steven Emmerson <emmerson at ucar.edu>
> *Sent:* 21 May 2018 19:18
> *To:* Hamilton, Steve <sj.hamilton at fugro.com>
> *Cc:* cf-metadata at cgd.ucar.edu
> *Subject:* Re: [CF-metadata] Platform Heave
>
> Whatever name you come up with, the canonical unit of the heave rate
> shouldn't be "ms-1", but rather one of the following:
>
> m s-1
>
> m/s
>
> m.s-1
>
> I favor "m/s".
>
>
> Regards,
>
> Steve Emmerson
>
> On Mon, May 21, 2018 at 6:32 AM, Hamilton, Steve
> <sj.hamilton at fugro.com <mailto:sj.hamilton at fugro.com>> wrote:
>
> Hi
>
> I am trying to find the CF name for heave of a vessel or
> platform.? platform_roll_angle and platform_pitch_angle already
> exist but nothing on heave
>
> Would be the following be acceptable
>
> Platform_heave (m)
>
> Platform_heave_rate (ms-1)
>
> Standard names for platform describe the motion and orientation of
> the vehicle from which observations are made e.g. aeroplane, ship
> or satellite.
>
> Kind Regards,
>
> Steve
>
>
--
*******************************************************
* 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 Fri May 25 2018 - 07:46:35 BST
