I agree with Bruno -- platform angle as it is defined in the request is the
angle of the _platform_ with respect to a reference direction ("the horizontal
angle between the line of sight from the observation point to the platform and
a reference direction at the observation point, which is often due north").
The seems like platform orientation to me too.
I wasn't excited about the name platform_azimuth_angle anyway, because it is
ambiguous on this exact point -- is it the azimuth angle of the platform, or of
the instrument on the platform? (the former, in this case).
Platform_orientation seems to be the accepted name for the purpose.
The definition is very weak though -- can we propose the substitution of this
definition for that one?
John
On Jan 14, 2013, at 09:17, Bruno PIGUET wrote:
> Le 14/01/2013 17:21, Aleksandar Jelenak - NOAA Affiliate a écrit :
>> Dear Bruno,
>>
>> On Fri, Jan 11, 2013 at 11:52 AM, Bruno PIGUET <bruno.pig...@meteo.fr> wrote:
>>> I have one remark about "platform_azimuth_angle"
>>>
>>> I like this name and it correspond to usual navigation definition (as
>>> far as I can tell from my experience with airborne and shipborne
>>> measurements), but...
>>>
>>> There is already a standard name called "platform_orientation", whose
>>> definition seems to be the same, even if less precisely-worded : The
>>> platform orientation is the direction in which the "front" or
>>> longitudinal axis of the platform is pointing (not necessarily the same
>>> as the direction in which it is travelling, called platform_course).
>>
>> platform_orientation is not the same as platform_azimuth_angle. This
>> azimuth angle is related to measurements made by an instrument mounted
>> on a platform (satellite, ship, airplane, truck, etc.).
>
> Sorry for looking dumb, but I don't see the difference (except that
> "platform_orientation" is not precisely defined).
>
> I'm currently producing CF files containing airborne measurements,
> and the parameter which is usually called "heading", which is in fact
> exactly defined as "platform_azimuth_angle", is qualified with
> "standard_name = platform orientation".
>
> Bruno.
> --
> bruno.pig...@meteo.fr
> Équipe GMEI/TRAMM
> CNRM-GAME : UMR Meteo-France/CNRS n°3589
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----------------
John Graybeal <mailto:jgrayb...@ucsd.edu> phone: 858-534-2162
Product Manager
Ocean Observatories Initiative Cyberinfrastructure Project:
http://ci.oceanobservatories.org
Marine Metadata Interoperability Project: http://marinemetadata.org
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