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I am not sure if GDAL is recognizing that the projection is just EPSG:3857 by the code but I suppose that the projection info it finds is correct. Make the same test with ogrinfo. If you can't get the same info with C# then there may be something wrong in the bindings or in your code. ogr2ogr -f "ESRI Shapefile" -s_srs epsg:4326 -t_srs epsg:3857 ...


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EPSG:9806 is the transformation method called Cassini-Soldner, but this is not the kind of EPSG code that includes the transformation parameters which are necessary for QGIS. Usually, shapefile datasets include a .prj file with the CRS information. If you do not have it, you might go back to the place where you got the data from and look for further ...


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If you compare your input and what the service sends back for EPSG:3857 you can indeed see many differences, for example: DATUM["World Geodetic System 1984", DATUM["WGS_1984" PROJECTION["Popular Visualisation Pseudo Mercator", AUTHORITY["EPSG","1024"]] PROJECTION["Mercator_1SP"] So you were right with your guess "Or PostGIS stores SRText differently ...



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