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 _______________________________________________ CF-metadata mailing list [email protected]<mailto:[email protected]> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ________________________________ This message (and any attachments) is for the recipient only. NERC is subject to the Freedom of Information Act 2000 and the contents of this email and any reply you make may be disclosed by NERC unless it is exempt from release under the Act. Any material supplied to NERC may be stored in an electronic records management system. ________________________________
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