Can you read .prj to create SpatialReference?

[soba-noodle]

In order to use the polygon geometry in shapefile, you have to know the (projection spatial reference) in order to translate shapefile coordinates to WGS84. Can you point me a way to read .prj to create a spatial reference? Thanks.

[KubaSzostak]

I've created a sample code that demonstrates how to read the .prj file and create a spatial reference for transforming shapefile coordinates to WGS84. You can find the implementation here. Let me know if you need any further assistance.

[soba-noodle]

Thanks for your quick reply.

My shapefile projection is shapefile.Projection (created in ArcGISPro). PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0]]

var transformation = transformationFactory.CreateFromCoordinateSystems(sourceCs, targetCs); throws exception: 'Projection Mercator_Auxiliary_Sphere is not supported. I'm really surprised by this exception.

Thanks.

Tosa

On Sat, Sep 7, 2024 at 4:28 AM Kuba Szostak @.***> wrote:

I've created a sample code that demonstrates how to read the .prj file and create a spatial reference for transforming shapefile coordinates to WGS84. You can find the implementation here https://github.com/NetTopologySuite/NetTopologySuite.IO.Esri/blob/develop/test/NetTopologySuite.IO.Esri.Test/Issues/Issue056.cs. Let me know if you need any further assistance.

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[KubaSzostak]

See also: https://github.com/NetTopologySuite/ProjNet4GeoAPI/issues/125