Fuentes de info.

• GEOnet Names Server - Freely available GIS information for areas outside of the U.S.A. and Antarctica, updated monthly by the National Geospatial-Intelligence Agency (NGA) and the U.S. Board on Geographic Names (US BGN).
  • Aqui hay un directorio de sitios físicos de todo el mundo, con sus geo-referencias : http://earth-info.nga.mil/gns/html/cntry_files.html .
  • Los campos están explicados aqui : http://earth-info.nga.mil/gns/html/gis_contryfiles.html . Incluyen: A = Administrative region; P = Populated place; V = Vegetation; L = Locality or area; U = Undersea; R = Streets, highways, roads, or railroad; T = Hypsographic; H = Hydrographic; S = Spot feature.
• Geographic Names Information System (GNIS) - Freely available database containing information on almost 2 million physical features, places, and landmarks in the U.S.A.
• Geobase - Free geospatial data for Canada, including administrative boundaries, digital elevation data, geodetic network, data alignment layer, geographical names, and national road network