Commits on May 11, 2023

1. CRS instanciation from PROJ.4 string: set 'Unknown based on XXXX elli… …

   …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 OSGeo#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]]]]
   ```

   

   rouault committed May 11, 2023
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