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
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