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I am working on raster data using GDAL. When I extract coordinate system information of the files I got this:
PROJCS["Geostationary_Satellite", GEOGCS["GCS_Unknown datum based upon the custom ellipsoid", DATUM["D_Not specified (based on custom ellipsoid)", SPHEROID["Custom_ellipsoid",6378140,298.252981]], PRIMEM["Greenwich",0], UNIT["Degree",0.017453292519943295]], PROJECTION["Geostationary_Satellite"], PARAMETER["central_meridian",0], PARAMETER["satellite_height",35785831], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["Meter",1]]

I have to transform the coordinate system of my other files into this coordinate system. But the problem is that I don't know how to introduce this coordinate system to my program. I can't find EPSG or Proj4 for it. Any solution or alternative?

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How about using gdalwarp?

First copy the above well known text to 'target_srs.prf' (or whatever name you like). Then:

    gdalwarp -t_srs target_srs.prf inputraster outputraster

Full documentation on gdalwarp is here. I think that you can safely omit the s_srs flag as gdal should read the inputraster to get the srs.

Alternatively, what is your program? QGIS?

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The problem is gdalwarp sometimes (when the srs is so alien!) can't recognize the source srs then it'll be a problem @Aragon . – f.ashouri Nov 26 '12 at 10:37

The easiest way which I have used before(gdalbuildvrt):

gdalbuildvrt myVRT.vrt *_sk.tif

Then open your myVRT.vrt file with any text editor and add your projection into .. as your .vrt file....

I hope it helps you...

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