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The National Topographic System or NTS is the system used by Natural Resources Canada for providing general purpose topographic maps of the country. NTS maps are available in a variety of scales, the standard being 1:50,000 and 1:250,000 scales.
US Topo map data is derived from the geographic information system (GIS) data of The National Map and is continuously updated via National, state, local, and commercial partnerships. Current and historic USGS topographic maps are available for immediate download from The National Map Downloader.
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What is the US Topo series?
As one of the cornerstones of the U.S. Geological Survey's (USGS) National Geospatial Program, The National Map is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. It has many uses ranging from recreation to scientific analysis to emergency response.
In modern mapping, a topographic map or topographic sheet is a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but historically using a variety of methods.
Though designed to look like traditional 7.5-minute topographic maps, US Topo maps are mass-produced from secondary sources, primarily The National Map and other government GIS databases. US Topo maps are a repackaging of GIS data in traditional map form for the benefit of non-specialist map users.
The physiographic regions of the contiguous United States comprise 8 divisions, 25 provinces, and 85 sections. The system dates to Nevin Fenneman 's report Physiographic Divisions of the United States , published in 1916.
Mar 1, 2019 · To meet these increasing demands, NMCAs have established national topographic databases based on their traditional topographic map series. The content of topographic maps evolved into topographic reference data that were structured into themes and feature types.
