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")))