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USGS DEM
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==External links== * ''Standards for digital elevation models'', U.S. Department of the Interior, U.S. Geological Survey, National Mapping Division (1992): ** [https://web.archive.org/web/20180612184053/https://nationalmap.gov/standards/pdf/1DEM0897.PDF Part 1: General (1992)] ** [https://web.archive.org/web/20180612184054/https://nationalmap.gov/standards/pdf/2DEM0198.PDF Part 2: Specifications (1995)] ** [https://web.archive.org/web/20180612184055/https://nationalmap.gov/standards/pdf/3DEM0897.PDF Part 3: Quality control (1992)] ** [https://web.archive.org/web/20180612184052/https://nationalmap.gov/standards/pdf/PDEM0198.PDF Errata and changes (1998)] * Sources for USGS DEMs: ** [https://open.canada.ca/data/en/dataset/042f4628-94b2-40ac-9bc1-ca3ac2a27d82 Canadian Digital Elevation Data, Level 1] [[Category:GIS raster file formats]] [[Category:United States Geological Survey|DEM]] [[Category:Digital elevation models]]
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