Map data

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Here is a list of suggested free sources for downloading map data.

DTED0

Coverage	Web link
Worldwide elevation	http://geoengine.nima.mil/muse-cgi-bin/rast_roam.cgi

ESRI shape

Coverage	Web link	Alternative web link
Worldwide map of countries	http://en.wikipedia.org/wiki/Global_Administrative_Unit_Layers	http://www.bluemarblegeo.com/products/worldmapdata.php?op=download (a lower resolution map)
US states	http://nationalmap.gov/small_scale/atlasftp.html	http://www.census.gov/geo/maps-data/data/cbf/cbf_state.html (various scales)
US counties	http://www.census.gov/geo/maps-data/maps/county_wall.html	http://www.census.gov/geo/maps-data/data/cbf/cbf_counties.html (various scales)
US ZIP codes	http://www.arcgis.com/home/item.html?id=8d2012a2016e484dafaac0451f9aea24

ESRI shape or TIGER/Line

Coverage	Web link
USA	http://data.geocomm.com/catalog/US/datalist.html

GeoTIFF, JPG or PNG

Coverage	Web link	Alternative web link
Worldwide	http://www.unearthedoutdoors.net/global_data/true_marble/download (various scales)
Worldwide satellite map from NASA	http://earthobservatory.nasa.gov/Features/BlueMarble/ with a download mirror at http://mirrors.arsc.edu/nasa/world_500m/	http://neo.sci.gsfc.nasa.gov/Search.html (a lower resolution map)

GTOPO30

Coverage	Web link
Worldwide elevation	https://lta.cr.usgs.gov/GTOPO30

S57

Coverage	Web link
USA	http://www.charts.noaa.gov/ENCs/ENCs.shtml

VMAP0

Coverage	Web link
Worldwide	http://geoengine.nga.mil/geospatial/SW_TOOLS/NIMAMUSE/webinter/vmap0_legend.html

Other data sources

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Programming with JViews Maps