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Returns the coordinate reference system (CRS) of a raster as a string in the specified format. If no format is specified, the CRS is returned in PROJJSON format. Returns null if the raster has no CRS defined.

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Signatures

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Parameters

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raster
Raster
required
The input raster.
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format
String
The format value.

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Return type

A string representation.

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Examples

Getting CRS in WKT1 format:
Getting CRS in PROJ string format:
Getting CRS in WKT2 format:

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Limitations

The wkt2, proj, and projjson output formats are generated by proj4sedona from the raster’s internal WKT1 CRS. This conversion may cause the following limitations:
  • Unsupported projection types: Some projection types (e.g., Krovak, Hotine Oblique Mercator) cannot be exported to wkt2, proj, or projjson formats and will throw an error. Use 'wkt1' format for these.
RS_CRS returns null only when the raster has no CRS defined. Note that RS_SRID may return 0 either when no CRS is defined or when a custom (non-EPSG) CRS has been set via RS_SetCRS, so RS_SRID = 0 does not always mean “no CRS”. To test for a missing CRS, use RS_CRS(raster) IS NULL. The wkt1 format always produces a lossless representation of the internally stored CRS.