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2. 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 ...

3. 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.

4. The National Map - Wikipedia

   en.wikipedia.org/wiki/The_National_Map

   The data was entered in spreadsheet format or in ESRI shapefiles and submitted via e-mail to the USGS National Geospatial Technical Operations Center(s) in Denver, Colorado, and Rolla, Missouri. During the registration process, prospective volunteers submitted a list of the 7.5 minute quadrangle maps on which they wished to work.

5. 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.

6. Blue Marble Geographics - Wikipedia

   en.wikipedia.org/wiki/Blue_Marble_Geographics

   Global Mapper handles both vector, raster, and elevation data, and provides viewing, conversion, and other general GIS features. In 1995 the USGS was in need of a Windows viewer for their data products, so they developed the dlgv32 application for viewing their DLG (Digital Line Graph) vector data products.

7. List of free geology software - Wikipedia

   en.wikipedia.org/wiki/List_of_free_geology_software

   Python library for the manipulation and storage of a wide range of geoscientific data (points, curve, surface, 2D and 3D grids) in geoh5 file format, natively supported by Geoscience ANALYST free 3D viewer Mira Geoscience Ltd. LPGL 3.0 Cross-platform: Python: Documentation and tutorials fully available in ReadTheDocs: geoapps repository [24]

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, referred to as the "map collar".

9. GDAL - Wikipedia

   en.wikipedia.org/wiki/GDAL

   The Geospatial Data Abstraction Library (GDAL) is a computer software library for reading and writing raster and vector geospatial data formats (e.g. shapefile), and is released under the permissive X/MIT style free software license by the Open Source Geospatial Foundation.