Dear All,
I agree with Nan that definitions of pitch roll and yaw would improve the existing Standard Name definitions. I also agree with using the existing orientation Standard Names for ADCPs and that the 'platform' definition wording could make this clearer. However, such an enhancements should be submitted as a separate proposal and not be considered as part of Steve's proposal. 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-boun...@cgd.ucar.edu> on behalf of Nan Galbraith <ngalbra...@whoi.edu> Sent: 25 May 2018 14:46 To: cf-metadata@cgd.ucar.edu Subject: Re: [CF-metadata] Platform Heave 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-boun...@cgd.ucar.edu> on behalf of > Hamilton, Steve <sj.hamil...@fugro.com> > *Sent:* 25 May 2018 08:51 > *To:* cf-metadata@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 <emmer...@ucar.edu> > *Sent:* 21 May 2018 19:18 > *To:* Hamilton, Steve <sj.hamil...@fugro.com> > *Cc:* cf-metadata@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.hamil...@fugro.com <mailto:sj.hamil...@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 * ******************************************************* _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ________________________________ This message (and any attachments) is for the recipient only. 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