[Geotiff] Projection Linear Units and Ellipsoid:

Frank Warmerdam warmerdam at pobox.com
Wed Jan 21 12:39:41 PST 2009

Reznik, Aleksandr wrote:
> Hello, 
> I have a what appears to be a GeoTiff with the following info from
> libtiff:
>       GeogEllipsoidGeoKey (Short,1): Ellipse_Sphere
>       GeogSemiMajorAxisGeoKey (Double,1): 6378137
>       GeogSemiMinorAxisGeoKey (Double,1): 6378137
> GCS: 4326/WGS 84
> Datum: 6326/World Geodetic System 1984
> Ellipsoid: 7035/(unknown) (6378137.00,6378137.00)
> I am wondering what is missing in the Ellipsoid field (unknown) part and
> how to get that into this file and also how do I encode the Projection
> Linear Units, I want it to be 9001/metre.


There is nothing wrong with the file.  I presume (unknown) is showing
up because listgeo was unable to find the ellipsoid.csv support file at
runtime.  If things aren't in the standard location I believe you can
set the GEOTIFF_CSV environment variable to point to the directory containing
the file.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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