Login
Login

Digital raster graphic

File:Topographic map example.png

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". The map file is UTM projected and georeferenced to the surface of the Earth. DRG's are regularly used in GIS applications. DRGs were first produced in 1995.

See also

External links

{{linkfarm|date=November 2016}}

  • Libre Map Project
  • [https://archive.org/details/maps_usgs All 50 States USGS Topographic Maps on the Internet Archive]
  • [http://libremap.org USGS Topographic Maps of ALL 50 States]
  • USGS Sites
  • [http://topomaps.usgs.gov/drg Digital Raster Graphics] {{Webarchive|url=https://web.archive.org/web/20050521074431/http://topomaps.usgs.gov/drg/ |date=2005-05-21 }}
  • [https://web.archive.org/web/20071228110713/http://edcsns17.cr.usgs.gov/EarthExplorer/ Earth Explorer (GeoTIFFs)]
  • [https://web.archive.org/web/20130213221700/http://store.usgs.gov/b2c_usgs/usgs/maplocator/%28xcm%3Dr3standardpitrex_prd%26layout%3D6_1_61_48%26uiarea%3D2%26ctype%3DareaDetails%26carea%3D%24ROOT%29/.do Map Locator (GeoPDFs)]
  • [http://kymartian.ky.gov/krgmaps/index.html Kentucky Raster Graphics Image Download Center] {{Webarchive|url=https://web.archive.org/web/20060925215612/http://kymartian.ky.gov/krgmaps/index.html |date=2006-09-25 }}
  • [http://nris.mt.gov/nsdi/drg.html Montana State Library Digital Raster Graphics download page]
  • Pennsylvania Spatial Data Access sites
  • [https://web.archive.org/web/20030802221739/http://www.pasda.psu.edu/access/drg24klist.cgi Digital Raster Graphics for PA (free)]
  • [https://web.archive.org/web/20030802221655/http://www.pasda.psu.edu/access/drg24k-clist.cgi Digital raster graphics without collar info for PA (free)]
  • [ftp://www.pasda.psu.edu/pub/pasda/other_states/wv/drg24k FTP site, DRGs for West Virginia (free)]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}}
  • [ftp://www.pasda.psu.edu/pub/pasda/other_states/ny/drg24k FTP site, DRGs for New York (free)]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}}
  • [ftp://www.pasda.psu.edu/pub/pasda/other_states/va/drg24k FTP site, DRGs for Virginia (free)]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}}
  • [ftp://www.pasda.psu.edu/pub/pasda/other_states/md/drg24k FTP site, DRGs for Maryland (free)]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}}
  • [ftp://www.pasda.psu.edu/pub/pasda/other_states/dc/drg24k FTP site, DRGs for Washington DC (free)]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}}
  • [ftp://www.pasda.psu.edu/pub/pasda/other_states/de/drg24k FTP site, DRGs for Delaware (free)]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}}
  • [ftp://www.pasda.psu.edu/pub/pasda/other_states/nc/drg24k FTP site, DRGs for North Carolina (free)]{{dead link|date=May 2025|bot=medic}}{{cbignore|bot=medic}}
  • Texas Natural Resources Information System
  • [https://web.archive.org/web/20070403201813/http://www.tnris.state.tx.us/digital.htm DRGs without collars organized by county]

Category:Cartography

Category:GIS raster file formats

Category:United States Geological Survey

{{Cartography-stub}}