OpenStreetMap is a free editable map of the whole world. It is made by people like you. OpenStreetMap allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth.
F. Schmid. Proceedings of the 4. Internat. Symposium on Location Based Services & TeleCartography, 0, Department of Land Surveying & Geo-Informatics, HongKong Polytechnic University; HongKong, (2007)
F. Schmid. Proceedings of the 4. Internat. Symposium on Location Based Services & TeleCartography, 0, Department of Land Surveying & Geo-Informatics, HongKong Polytechnic University; HongKong, (2007)