I believe it's a synonym within the oceanographic community for the
vertical motion of an ocean-going platform.
https://en.wikipedia.org/wiki/Ship_motions
Could just be jargon but it strike me as more complex: nonetheless a
vertical position relative to a datum, but the buoyancy, stability and
momentum of the platform are implied as part of the dynamics.? It seems
that the datum is not a geophysical one alone but confounded with the
'normal' waterline for a platform so it may be relative to the water
level in which the platform is embedded.? That's a tough one.? Two
different platforms on the same sea surface would have different
'heave', for example.
J.
On 5/25/18 19:54, Jim Biard wrote:
> 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
> <mailto: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
> <mailto:cf-metadata-bounces at cgd.ucar.edu>> on behalf of Nan
> Galbraith <ngalbraith at whoi.edu <mailto:ngalbraith at whoi.edu>>
> *Sent:* 25 May 2018 14:46
> *To:* cf-metadata at cgd.ucar.edu <mailto: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
> <mailto:cf-metadata-bounces at cgd.ucar.edu>> on behalf of
> > Hamilton, Steve <sj.hamilton at fugro.com
> <mailto:sj.hamilton at fugro.com>>
> > *Sent:* 25 May 2018 08:51
> > *To:* cf-metadata at cgd.ucar.edu <mailto: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
> <mailto:emmerson at ucar.edu>>
> > *Sent:* 21 May 2018 19:18
> > *To:* Hamilton, Steve <sj.hamilton at fugro.com
> <mailto:sj.hamilton at fugro.com>>
> > *Cc:* cf-metadata at cgd.ucar.edu <mailto: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>
> <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
> >
> >
>
>
> --
> *******************************************************
> * 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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John Helly, University of California, San Diego / San Diego Supercomputer Center / Scripps Institution of Oceanography / 760 840 8660 mobile / http://www.sdsc.edu/~hellyj
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