1GeoWKT

This package gives you access to an offline (sucked up from http://spatialreference.org) GeoWKT database. It provides a simple interface geowkt:wkt that returns a a-list style entry for the given EPSG code. Example:

  (geowkt:wkt 2154)
  =>
  (:PROJCS "RGF93 v1 / Lambert-93"
           (:GEOGCS "RGF93 v1"
                    (:DATUM "Reseau_Geodesique_Francais_1993_v1"
                            (:SPHEROID "GRS 1980" 6378137 298.257222101 (:AUTHORITY "EPSG" "7019"))
                            (:AUTHORITY "EPSG" "6171"))
                    (:PRIMEM "Greenwich" 0 (:AUTHORITY "EPSG" "8901"))
                    (:UNIT "degree" 0.0174532925199433 (:AUTHORITY "EPSG" "9122"))
                    (:AUTHORITY "EPSG" "4171"))
           (:PROJECTION "Lambert_Conformal_Conic_2SP")
           (:PARAMETER "latitude_of_origin" 46.5) (:PARAMETER "central_meridian" 3)
           (:PARAMETER "standard_parallel_1" 49) (:PARAMETER "standard_parallel_2" 44)
           (:PARAMETER "false_easting" 700000) (:PARAMETER "false_northing" 6600000)
           (:UNIT "metre" 1 (:AUTHORITY "EPSG" "9001")) (:AXIS "Easting" :EAST)
           (:AXIS "Northing" :NORTH) (:AUTHORITY "EPSG" "2154"))

You can also use a projection name string but this is more fragile and also subject to collision. In the following example, there is such a collision and a list of possible entries is return instead:

  (geowkt:wkt "American Samoa 1962 / American Samoa Lambert (deprecated)")
  =>
  ((:PROJCS "American Samoa 1962 / American Samoa Lambert (deprecated)"
            (:GEOGCS "American Samoa 1962"
                     (:DATUM "American_Samoa_1962"
                             (:SPHEROID "Clarke 1866" 6378206.4 294.978698213898
                                        (:AUTHORITY "EPSG" "7008"))
                             (:AUTHORITY "EPSG" "6169"))
                     (:PRIMEM "Greenwich" 0 (:AUTHORITY "EPSG" "8901"))
                     (:UNIT "degree" 0.0174532925199433 (:AUTHORITY "EPSG" "9122"))
                     (:AUTHORITY "EPSG" "4169"))
            (:PROJECTION "Lambert_Conformal_Conic_1SP")
            (:PARAMETER "latitude_of_origin" -14.2666666666667)
            (:PARAMETER "central_meridian" -170) (:PARAMETER "scale_factor" 1)
            (:PARAMETER "false_easting" 500000) (:PARAMETER "false_northing" 0)
            (:UNIT "US survey foot" 0.304800609601219 (:AUTHORITY "EPSG" "9003"))
            (:AXIS "Easting" :EAST) (:AXIS "Northing" :NORTH) (:AUTHORITY "EPSG" "2194"))
   (:PROJCS "American Samoa 1962 / American Samoa Lambert (deprecated)"
            (:GEOGCS "American Samoa 1962"
                     (:DATUM "American_Samoa_1962"
                             (:SPHEROID "Clarke 1866" 6378206.4 294.978698213898
                                        (:AUTHORITY "EPSG" "7008"))
                             (:AUTHORITY "EPSG" "6169"))
                     (:PRIMEM "Greenwich" 0 (:AUTHORITY "EPSG" "8901"))
                     (:UNIT "degree" 0.0174532925199433 (:AUTHORITY "EPSG" "9122"))
                     (:AUTHORITY "EPSG" "4169"))
            (:PROJECTION "Lambert_Conformal_Conic_1SP")
            (:PARAMETER "latitude_of_origin" -14.2666666666667)
            (:PARAMETER "central_meridian" 170) (:PARAMETER "scale_factor" 1)
            (:PARAMETER "false_easting" 500000) (:PARAMETER "false_northing" 0)
            (:UNIT "US survey foot" 0.304800609601219 (:AUTHORITY "EPSG" "9003"))
            (:AXIS "Easting" :EAST) (:AXIS "Northing" :NORTH) (:AUTHORITY "EPSG" "2155")))