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 <[email protected]> on behalf of
Hamilton, Steve <[email protected]>
*Sent:* 25 May 2018 08:51
*To:* [email protected]
*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 <[email protected]>
*Sent:* 21 May 2018 19:18
*To:* Hamilton, Steve <[email protected]>
*Cc:* [email protected]
*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
<[email protected] <mailto:[email protected]>> 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 *
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