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  2. Libre Map Project - Wikipedia

    en.wikipedia.org/wiki/Libre_Map_Project

    The Libre Map Project was started by Jared Benedict and around 100 additional individuals contributing money to purchase (or "liberate") a full set of 1:24K scale USGS topographic maps in Digital raster graphic form. [1] The map files were then hosted by archive.org to ensure the map data will continue to be freely available to everyone ...

  3. TopoQuest - Wikipedia

    en.wikipedia.org/wiki/TopoQuest

    TopoQuest is a free web mapping service built on open source software that provides internet-based topographic map for most of the United States.. The site is one of three internet services used by Wikipedia for providing topographic maps.

  4. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    The National Map Corps consists of volunteers who devote some of their time to provide cartographic information to the U.S. Geological Survey.The only requirements to participate are having access to the Internet and a current familiarity with the area being mapped. [6]

  5. List of GIS data sources - Wikipedia

    en.wikipedia.org/wiki/List_of_GIS_data_sources

    Data repository for the City of Philadelphia, which includes GIS data-sets relating to the Philadelphia region, available to view and download in various formats York County Open Data Portal: Data repository for York County, which includes GIS data-sets relating to York County PA, available to view and download in various formats

  6. United States Geological Survey - Wikipedia

    en.wikipedia.org/wiki/United_States_Geological...

    The United States remains virtually the only developed country in the world without a standardized civilian topographic map series in the standard 1:25,000 or 1:50,000 metric scales, making coordination difficult in border regions (the U.S. military does issue 1:50,000 scale topo maps of the continental United States, though only for use by ...

  7. Digital raster graphic - Wikipedia

    en.wikipedia.org/wiki/Digital_raster_graphic

    A digital raster graphic (DRG) is a digital image resulting from scanning a paper USGS topographic map for use on a computer. DRGs created by USGS are typically scanned at 250 dpi and saved as a TIFF. The raster image usually includes the original border information, referred to as the "map collar".

  8. Microsoft Research Maps - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Research_Maps

    Microsoft Research Maps (MSR Maps) was a free online repository of public domain aerial imagery and topographic maps provided by the United States Geological Survey (USGS). The site was a collaboration between Microsoft Research (MSR), Bing Maps, and the USGS.

  9. TopoZone - Wikipedia

    en.wikipedia.org/wiki/TopoZone

    TopoZone is a website operated by Locality LLC that offers free online topographic maps.. It was founded in November 1999 by Ed McNierney whose company Maps a la carte, Inc. operated out of North Chelmsford, Massachusetts.