I've seen notes that SR-ORG:#### means that the SRS/CRS/projection definition is user defined. Is there an official location saying that? Some of these feel official. What is the canonical location for them? Is it the List user-contributed references at https://spatialreference.org/ref/sr-org/ or is there a specification someplace that defines the there is an SR-ORG space?


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“There are currently three distinct catalogs of spatial reference systems on this website -- EPSG, ESRI, and User-defined (called sr-org)”

SR-ORG is shorthand for SpatialReference.ORG

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