[gdal-dev] Require Help Transforming into Equirectangular

ssobieraj ssobieraj at cdlsystems.com
Tue Nov 30 16:21:53 EST 2010


I'm trying to use FWTools to transform from an arbitrary Datum/Projection
pair in an arbitrary format into a Geographic (lat/lon) projection with the
WGS84 ellipsoid in GeoTiff format.

To do this, I've tried the following:

gdalwarp -s_srs Input.prj -t_srs Output.prj Input.xyz Output.tif

Where Input.prj is formatted in Well-Known-Text format and contains
information specifically for the Input.xyz file.
Output.prj is also in WKT format but contains the following:

GEOGCS["Geographic Coordinate

I've been successful in using this set-up for transforming from UTM
projection in WGS84 datum, but I am having trouble transforming from
Sinusoidal projection in RT90 datum.  The output file is no longer skewed in
the Sinusoidal projection, but I cannot seem to get the datum information to
coincide, resulting in a 10+ km discrepancy.

A copy of the WKT-formatted PRJ file is seen below:

PROJCS["Sinusoidal",GEOGCS["Geographic Coordinate

Any ideas as to why I would be experiencing this offset?


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