The best GPS units offer reliable navigation in even the most off-the-beaten-track areas, including topographical and ...

With this methodology, freely available worldwide road maps, such as OpenStreetMap, are supplemented and improved by automated analysis of aerial photographs. If you use the records or the code, ...

More than 500,000 images, such as this one of Housesteads Roman Fort on Hadrian's Wall, were used for the map More than half a million aerial images of historical sites in England have been used ...