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
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On Fri, May 25, 2018 at 7:28 AM, Lowry, Roy K. <rkl at bodc.ac.uk> 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 <cf-metadata-bounces at cgd.ucar.edu> on behalf of Nan
> Galbraith <ngalbraith at whoi.edu>
> *Sent:* 25 May 2018 14:46
> *To:* cf-metadata at 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-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
> <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
> >
> >
>
>
> --
> *******************************************************
> * 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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