[GRASS-dev] Galaxy coordinate system

Yann Chemin yann.chemin at gmail.com
Wed May 1 08:45:51 PDT 2013

Hi Hamish !
I just submitted to add-ons an adaptation of Meloch craters to
meteorite or meteorite to crater model. It would be soooo good if I
could have support for Mars or Moon. Yes, I have used the 0-360
support with GCM data before (most welcome support at that time).

Is there something I can do to facilitate the finalization of that
port, i will look into trac for info.

On 1 May 2013 03:06, Hamish <hamish_b at yahoo.com> wrote:
> Yann wrote:
>> I would like to map the Milky Way stars and run some
>> analysis on it.
>> Is there support for Milky Way and Galaxy coordinate systems
>> in general in GRASS?
> Not specifically, but depending on your reference frame the
> simple XY and lat/lon+spheroid locations can set up arbitrary
> Cartesian or polar coordinate systems as you like.
> fwiw--
> Some time ago I had a look at importing a star catalog as an
> example of working with sparse 3D points in GRASS, but that
> was earth-centric so a lat/lon location did ok for azimuth and
> altitude. A big problem there at the time was finding a catalog
> with a truly FOSS-friendly license.
> Note GRASS 7 and its wxGUI location wizard have ellipsoid tables
> and support for the planetary bodies in our solar system. I need
> help with the final 5% of the python coding to finish that off
> in the loc'n wizard (see trac).  Longitude represented as 0-360
> has had support in the GRASS raster engine for a number of years.
> see also  http://grasswiki.osgeo.org/wiki/Planetary_mapping
> Hamish

Yann Chemin
Researcher at IWMI
Skype/FB: yann.chemin

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