projjson.rst: point to spatialreference.org

OSGeo · Jan 23, 2024 · 22f69fb · 22f69fb
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@@ -1105,3 +1105,9 @@ Reference implementation
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 PROJJSON is available as input and output of the `PROJ <https://proj.org>`_ software since PROJ 6.2.
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+Online CRS definitions as PROJJSON
+----------------------------------
+
+The https://spatialreference.org/ website features CRS definitions for various authorities under a
+number of formats, including PROJJSON. For example: https://spatialreference.org/ref/epsg/4326/projjson.json