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  1. It supported a national coordinate system that spanned the continent, coded lines as arcs having a true embedded topology and it stored the attribute and locational information in separate files. As a result of this, Tomlinson has become known as the "father of GIS", particularly for his use of overlays in promoting the spatial analysis of convergent geographic data. [12]

  2. In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a point is specified by three numbers: the radial distance of that point from a fixed origin, its polar angle measured from a fixed zenith direction, and the azimuthal angle of its orthogonal projection on a reference plane that passes through the origin and is orthogonal to ...

  3. Il Geographic Information System (GIS) (anche detto sistema informativo geografico o anche sistema informativo territoriale) è un sistema informativo computerizzato che permette l'acquisizione, registrazione, analisi, visualizzazione, restituzione, condivisione e presentazione di informazioni derivanti da dati geografici (geo-riferiti).

  4. The Open Street Map tiles and the WMS webservice, are in the projected coordinate system that is based on the wgs84 datum. (EPSG 3857) So if you are making a web map, which uses the tiles from Google Maps or tiles from the Open Street Map webservice, they will be in Sperical Mercator (EPSG 3857 or srid: 900913) and hence your map has to have the same projection.

  5. › wiki › NantucketNantucket - Wikipedia

    (EN) Nantucket, su Geographic Names Information System, USGS. Controllo di autorità VIAF ( EN ) 244264840 · ISNI ( EN ) 0000 0004 0372 6237 · LCCN ( EN ) n79097424 · GND ( DE ) 4361932-0 · J9U ( EN , HE ) 987007550339505171 (topic) · WorldCat Identities ( EN ) lccn-n79097424