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A polished chunk of sandstone from a cave ... was the first to base county maps using on-site topographical ... Some of his maps are accurate to 1/1000 of a degree ...
Volunteered geographic information (VGI) is the harnessing of tools to create, assemble, and disseminate geographic data provided voluntarily by individuals. [1] [2] VGI is a special case of the larger phenomenon known as user-generated content, [3] and allows people to have a more active role in activities such as urban planning and mapping.
The Retriangulation of Great Britain was a triangulation project carried out between 1935 and 1962 that sought to improve the accuracy of maps of Great Britain. [1] Data gathered from the retriangulation replaced data gathered during the Principal Triangulation of Great Britain , which had been performed between 1783 and 1851.
The first Ramsden theodolite as used by Roy. (Destroyed by bomb damage in 1941.) In the aftermath of the Jacobite rising of 1745 it was recognised that there was a need for an accurate map of the Scottish Highlands and the necessary survey was initiated in 1747 by Lieutenant-Colonel David Watson, a Deputy Quartermaster-General of the Board of Ordnance.
This article's factual accuracy may be compromised due to out-of-date information. Please help update this article to reflect recent events or newly available information. ( April 2018 )
Triangulation can also refer to the accurate surveying of systems of very large triangles, called triangulation networks. This followed from the work of Willebrord Snell in 1615–17, who showed how a point could be located from the angles subtended from three known points, but measured at the new unknown point rather than the previously fixed ...
Here are the most popular Black Friday deals our AOL readers have been shopping today, including AirPods, smart plugs, Kate Spade bags, and Old Navy coats.
Overlays group together items on a map, allowing the user of the map to toggle the overlay's visibility and thus all items contained in the overlay. The application uses map tiles from a third-party (for example one of the mapping APIs) and adds its own collaboratively edited overlays to them, sometimes in a wiki fashion. If each user's ...