placemarks into NASA World Wind Google Earth Connectivity Add-on[リンク切れ] for ArchiCAD 9 Validate your KML (Online or Offline!), Google Maps API Blog. simplekml
Geodesy for the Layman, The Defense Mapping Agency, 1983 ^ Making maps compatible with GPS Archived 2011年7月21日, at the Wayback Machine. Government of Ireland
2011閲覧。 ^ a b “Tracks ofthe New York City Subway”. Tracks ofthe New York City Subway. 2015年10月9日閲覧。 ^ a b c d e “MTA Neighborhood Maps: Lower Manhattan”