Using base maps (roads, aerial, etc.) from imagery providers allows, not only the composition of more attractive Maps in mapping applications, but also the use of these base images as a practical reference system or a powerful tool for checking on the... more
Occasionally you will find some spatial data (SHP files or PostGIS tables, for example) that does not include geo-referencing information, but you know the Coordinate System (CRS) used to define the Features in the Table... more
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