Le 14/01/2013 18:29, John Graybeal a écrit :
> 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.
>
What I meant is that "platform_azimuth_angle" looks like a duplicate
of "platform_orientation".
But I agree that "sensor_azimuth_angle" is new and legitimate, for
the case of "heavy" platform carrying multiple instruments, some of
which possibly moving/scanning/..
Bruno.
> 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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