[gdal-dev] IAU2000 support?

[Hare, Trent]

Yann,
   Yes there has been no movement on pushing the planetary projection codes
as simple script or function call within GDAL. Instead of expanding all the
definitions as a large ASCII file, this method would allow us to more
easily grow once updated radii values are defined. The lunar definition is
not changing anytime soon but bodies like Mercury and even Mars will have
updates. Thus once the IAU publishes a new set of definitions, we will need
a new namespace (e.g. IAU2015). Most bodies will be the same but having a
flexible system which takes the smallest footprint would be best. Anyway, I
am hoping to move this issue forward by either finding time or funding a
contract.

As an alternative to the urn:ogc and the need for the local iau2000.wkt
file, you can use a an http address also. For example:
$ gdalsrsinfo "http://spatialreference.org/ref/iau2000/49900/"

PROJ.4 : '+proj=longlat +a=3396190 +b=3376200 +no_defs '

OGC WKT :
GEOGCS["Mars 2000",
    DATUM["D_Mars_2000",
        SPHEROID["Mars_2000_IAU_IAG",3396190.0,169.89444722361179]],
    PRIMEM["Greenwich",0],
    UNIT["Decimal_Degree",0.0174532925199433]]

Regards,
Trent

On Thu, Sep 24, 2015 at 5:13 AM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Le jeudi 24 septembre 2015 14:10:37, Yann a écrit :
> > sorry, I get this from Ubuntu, thus my question.
> >
> > gdalsrsinfo urn:ogc:def:crs:IAU2000:30100
> >
> > ERROR 1: ERROR - failed to load SRS definition from
> > urn:ogc:def:crs:IAU2000:30100
>
> I think this dates back to ancient GDAL versions but you need to add the
> iau2000.wkt file in the GDAL data directory.
>
> >
> > On 24/09/2015 11:45, Even Rouault wrote:
> > > Yann,
> > >
> > >> I have recovered a old script I made about 1.5 year ago (and about 1+
> > >> version of Ubuntu away) to process Chandrayaan-M3 Moon data in
> > >> IAU2000:30100 and it seems that gdal_translate/gdalwarp do not know
> that
> > >> code anymore.
> > >
> > > Looking at the code you need to use a OGC URN:
> > >
> > > $ gdalsrsinfo urn:ogc:def:crs:IAU2000:30100
> > >
> > > PROJ.4 : '+proj=longlat +a=1737400 +b=1737400 +no_defs '
> > >
> > > OGC WKT :
> > > GEOGCS["Moon 2000",
> > >
> > >      DATUM["D_Moon_2000",
> > >
> > >          SPHEROID["Moon_2000_IAU_IAG",1737400.0,0.0]],
> > >
> > >      PRIMEM["Greenwich",0],
> > >      UNIT["Decimal_Degree",0.0174532925199433]]
> > >>
> > >> This is not a blocker, since the wkt style works like a charm.
> > >>
> > >> We had discussions earlier about planetary support in this list, among
> > >> whom Trent was involved (IIRC). Does anybody have any update about the
> > >> status change for the newest version of GDAL?
> > >
> > > Status quo.
> > >
> > > Even
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20150924/877c7cce/attachment-0001.html>