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  2. TopoQuest - Wikipedia

    en.wikipedia.org/wiki/TopoQuest

    The viewer was made seamless by incorporating GDAL. In addition to matching the Topozone URL's, the website offers free download of GeoTIFFs, which Topozone had only offered for a premium. TopoQuest started adding Canadian 1:50K scale topographic maps in July 2008, and USGS 1:100K and 1:250K scale topographic maps in March 2009.

  3. Public Land Survey System - Wikipedia

    en.wikipedia.org/wiki/Public_Land_Survey_System

    This 1988 BLM map depicts the principal meridians and baselines used for surveying states (colored) in the Public Land Survey System.. The Public Land Survey System (PLSS) is the surveying method developed and used in the United States to plat, or divide, real property for sale and settling.

  4. Topographic map - Wikipedia

    en.wikipedia.org/wiki/Topographic_map

    A topographic map of Stowe, Vermont with contour lines Part of the same map in a perspective shaded relief view illustrating how the contour lines follow the terrain Sheet #535 (2013 version; second digital edition) of MTN50 Spanish National Topographic map series, covering Algete town (near Madrid) and its surroundings.

  5. Historical geographic information system - Wikipedia

    en.wikipedia.org/wiki/Historical_geographic...

    A historical geographic information system (also written as historical GIS or HGIS) is a geographic information system that may display, store and analyze data of past geographies and track changes in time.

  6. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    The National Map is a significant contribution to the U.S. National Spatial Data Infrastructure (NSDI) from the Federal Geographic Data Committee (FGDC) and currently is being transformed to better serve the geospatial community by providing high quality, integrated geospatial data and improved products and services including new generation ...

  7. OpenHistoricalMap - Wikipedia

    en.wikipedia.org/wiki/OpenHistoricalMap

    A historic map by the United States Coast and Geodetic Survey that has been georeferenced by the Regional Plan Association for mapping historic wetlands in OpenHistoricalMap. OpenHistoricalMap allows anyone with a free account to contribute directly to the map through an editor such as the iD Web application or the JOSM desktop application.