[Backport 9.2] CRS instanciation from PROJ.4 string: set 'Unknown based on XXXX ellipsoid' datum name... #3728
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…psoid' datum name... ...when instanciating from known +a,+rf and change WGS84 -> WGS 84 and GRS80 -> GRS 1980 to use EPSG names when building from +ellps=WGS84/GRS80 (fixes #3725) Now we get ``` $ bin/projinfo "+proj=geos +lon_0=0 +h=35786400 +ellps=WGS84 +units=m +sweep=y +no_defs +type=crs" PROJ.4 string: +proj=geos +lon_0=0 +h=35786400 +x_0=0 +y_0=0 +ellps=WGS84 +units=m +no_defs +type=crs WKT2:2019 string: PROJCRS["unknown", BASEGEOGCRS["unknown", DATUM["Unknown based on WGS 84 ellipsoid", ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1], ID["EPSG",7030]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8901]]], CONVERSION["unknown", METHOD["Geostationary Satellite (Sweep Y)"], PARAMETER["Longitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Satellite Height",35786400, LENGTHUNIT["metre",1, ID["EPSG",9001]]], PARAMETER["False easting",0, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",0, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1, ID["EPSG",9001]]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1, ID["EPSG",9001]]]] $ bin/projinfo "+proj=geos +lon_0=0 +h=35786400 +a=6378137.0 +rf=298.257223563 +units=m +sweep=y +no_defs +type=crs" PROJ.4 string: +proj=geos +lon_0=0 +h=35786400 +x_0=0 +y_0=0 +ellps=WGS84 +units=m +no_defs +type=crs WKT2:2019 string: PROJCRS["unknown", BASEGEOGCRS["unknown", DATUM["Unknown based on WGS 84 ellipsoid", ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1, ID["EPSG",9001]]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8901]]], CONVERSION["unknown", METHOD["Geostationary Satellite (Sweep Y)"], PARAMETER["Longitude of natural origin",0, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Satellite Height",35786400, LENGTHUNIT["metre",1, ID["EPSG",9001]]], PARAMETER["False easting",0, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",0, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1, ID["EPSG",9001]]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1, ID["EPSG",9001]]]] ```
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Backport #3727
Authored by: @rouault