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  1. In geodesy, conversion among different geographic coordinate systems is made necessary by the different geographic coordinate systems in use across the world and over time. . Coordinate conversion is composed of a number of different types of conversion: format change of geographic coordinates, conversion of coordinate systems, or transformation to different geodetic datu

  2. The distinction must be made between a singular geographic information system, which is a single installation of software and data for a particular use, along with associated hardware, staff, and institutions (e.g., the GIS for a particular city government); and GIS software, a general-purpose application program that is intended to be used in many individual geographic information systems in ...

  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. Google Maps is in a projected coordinate system that is based on the wgs84 datum. (EPSG 3857) The data in Open Street Map database is stored in a gcs with units decimal degrees & datum of wgs84. (EPSG: 4326) The Open Street Map tiles and the WMS webservice, are in the projected coordinate system that is based on the wgs84 datum. (EPSG 3857)

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