<creed@opengeospatial.org> writes
>The OGC has had numerous discussions about planetary (non-earth)
>coordinate reference systems.
>we decided that the planetary models are different enough from earth
>centric ones that the effort to enhance existing ISO, OGC, ITU, and IEC
>standards related to CRS requires additional consideration to properly
>extend the existing general reference model for spatial referencing by
>coordinates.
>Also, for those interested, the following is the 2008 NASA position on
>the Lunar Coordinate System.
[...]
All of which may be true (and is of interest to me, personally), but is
a red herring so far as the applicability of GeoURI to non-terrestrial
coordinates is concerned.
The usual reference scheme for the Moon has the location of the crater
Mosting A at:
geo:-0.7,5.9,ULCN2005
If a hypothetical second reference scheme, Foobar, has it at something
as significantly different as, say:
geo:33,88,Foobar
it matters not; the respective reference schemes will define what is
meant by those figures; and if necessary, how to convert them.
All that a parser needs to know are the latitude & longitude values, and
the scheme in use. My second example will be understood by any person,
application or device which understands "Foobar", and will be
interoperable between them; and between Foobar, ULCN2005 and any other
scheme for which a conversion algorithm exists.
(Further more, nobody would sensibly try to convert them into to WGS84.)
This is no different to the same point on Earth being referred to as:
52.548,-1.932,WGS84
and, by Ordnance Survey, as:
404611,294504,OSGB
(both values can be seen on <http://is.gd/NuIo>)
--
Andy Mabbett
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