PROJCS["MAGNA-SIRGAS / Origen-Nacional",
GEOGCS["MAGNA-SIRGAS",
DATUM["Marco_Geocentrico_Nacional_de_Referencia",
SPHEROID["GRS 1980",6378137,298.257222101,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6686"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,
AUTHORITY["EPSG","9122"]],
AUTHORITY["EPSG","4686"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",4.0],
PARAMETER["central_meridian",-73.0],
PARAMETER["scale_factor",0.9992],
PARAMETER["false_easting",5000000],
PARAMETER["false_northing",2000000],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","9377"]]
O la siguiente cadena Proj4:
+proj=tmerc +lat_0=4.0 +lon_0=-73.0 +k=0.9992 +x_0=5000000 +y_0=2000000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs