Hi. I get and endorse the need for pitch, roll, and yaw, but I remain perplexed about heave. How is a time series of 'heave' different from a time series of height relative to some vertical datum? I've yet to see a proposed definition that convinces me that this is a uniquely different quantity.
Grace and peace, Jim [image: CICS-NC] <http://www.cicsnc.org/>Visit us on Facebook <http://www.facebook.com/cicsnc> *Jim Biard* *Research Scholar* Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/> North Carolina State University <http://ncsu.edu/> NOAA National Centers for Environmental Information <http://ncdc.noaa.gov/> *formerly NOAA’s National Climatic Data Center* 151 Patton Ave, Asheville, NC 28801 e: [email protected] o: +1 828 271 4900 *Connect with us on Facebook for climate <http://www.facebook.com/NOAANCEIclimate> and ocean and geophysics <http://www.facebook.com/NOAANCEIoceangeo> information, and follow us on Twitter at @NOAANCEIclimate <http://www.twitter.com/NOAANCEIclimate>and @NOAANCEIocngeo <http://www.twitter.com/NOAANCEIocngeo>.* On Fri, May 25, 2018 at 7:28 AM, Lowry, Roy K. <[email protected]> wrote: > 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 <[email protected]> on behalf of Nan > Galbraith <[email protected]> > *Sent:* 25 May 2018 14:46 > *To:* [email protected] > *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 <[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] > <[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 * > ******************************************************* > > > _______________________________________________ > CF-metadata mailing list > [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. > ------------------------------ > > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > >
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