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In the planetary working group, there is a need for aliases because names or identifiers of some asteroids (for example) can change. The ISO 19111 specification already supports aliases, but not GeoTIFF. A possible approach would be as below:
"GCS Name = my CRS|Datum = My datum|Ellipsoid = my ellipsoid|Datum = My Datum alias|"
, "My datum" would be the primary datum name and "My datum alias" would be an alias for that datum.