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2. Libre Map Project - Wikipedia

   en.wikipedia.org/wiki/Libre_Map_Project

   The Libre Map Project is an online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. History [ edit ]

3. List of GIS data sources - Wikipedia

   en.wikipedia.org/wiki/List_of_GIS_data_sources

   Online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. NPScape United States Department of the Interior National Park Service NPScape is a landscape dynamics monitoring project that provides landscape-level data, tools, and evaluations for ...

4. Wikipedia : Graphics Lab/Resources/QGIS/Get ready

   en.wikipedia.org/wiki/Wikipedia:Graphics_Lab/...

   There are 2 kinds of data: raster GIS files — surfaces with limited precision represented by dots (pixels) — most of time topographic data; and vector GIS files — dots, lines and polygons. Below are both the biggest families, and some links to download the files needed for this tutorial.

5. The National Map - Wikipedia

   en.wikipedia.org/wiki/The_National_Map

   The National Map is part of the USGS National Geospatial Program. [3] The geographic information available includes orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures and land cover. The National Map is accessible via the Web, as products and services, and as downloadable data ...

6. Wikipedia : Graphics Lab/Resources/GIS sources and palettes

   en.wikipedia.org/.../GIS_sources_and_palettes

   Files: compressed file 870Kb, uncompressed file 2.2Mb, whole Earth, 1 tiles. —♣ Comment(s): Perfect for very large to local location maps/topographic maps. Smaller lakes to add handily. Additional GIS files: for historic, pluvial, north america, and Europe lakes, click on 'specifics'. Coastline:

7. National Lidar Dataset (United States) - Wikipedia

   en.wikipedia.org/wiki/National_Lidar_Dataset...

   Currently, the best source for nationwide LiDAR availability from public sources is the United States Interagency Elevation Inventory (USIEI). [1] The USIEI is a collaborative effort of NOAA and the U.S. Geological Survey, with contributions from the Federal Emergency Management Agency, the Natural Resources Conservation Service, the US Army Corps of Engineers, and the National Park Service.

8. 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

9. Wikipedia : WikiProject Maps/Source materials

   en.wikipedia.org/wiki/Wikipedia:WikiProject_Maps/...

   USGS Maps. Every USGS topographic map available for free download from the Internet Archive. OpenStreetMap - CC-BY-SA 2.0 vector map data collected by GPS; The Map Library - Maps for Central America and Africa. Tag with commons:Template:PD-MapLibrary (talk, backlinks, edit) GinkgoMaps - Free Digital Maps published under the CC-by Licence