[GRASS-user] Getting DATUM unknown when exporting to GTiff using r.out.gdal in python

Anne Brookes Anne.Brookes at jbaconsulting.com
Tue Nov 8 03:54:31 EST 2011

Thanks for your reply Hamish.

I have the following set up:

I am running Grass v6.4 in Windows XP
I have FWTools2.0.4 installed (for the GDAL library)
I have also installed gdalwin32-1.6
I have Proj4 v4.4.6 Win32 release installed
I also have Python 24, 25 and 26
My GDAL_DATA env variable is currently set to C:\program files\FWTools2.0.4\data and my PROJ_LIB variable to C:\program files\FWTools2.0.4\proj_lib

Does GRASS uses these environment variables?  Where does GRASS look for its projection library?

>From the GRASS cmd line in my GB location, the g.proj -p command gives:
        name:   Transverse Mercator
        proj:   tmerc
        datum:  osgb36
        ellps:  airy
        lat_0:  49
        lon_0:  -2
        k:              0.9996012717
        x_0:            400000
        y_0:            -100000
        no_defs:        defined
        unit:           metre
        units:  metres
        meters: 1

I hope this clarifies something. Thanks,
Anne Brookes
Senior Analyst

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From: Hamish [mailto:hamish_b at yahoo.com]
Sent: 08 November 2011 06:22
To: Anne Brookes
Subject: Re: [GRASS-user] Getting DATUM unknown when exporting to GTiff using r.out.gdal in python

Anne Brookes wrote:
> The problem is that the DATUM and SPHEROID information are not being
> properly exported from the LOCATION.

what version of proj4 is installed?
what version of gdal is installed?
what version of grass? which platform (windows/mac/linux)?

any custom weirdness on your local computer? (multiple versions in different
places for different needs)

what does "g.proj -p" report?


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