Canadian Mapping Resources

The National Topographic Data Base (NTDB) is a digital data base developed by Geomatics Canada. It covers the entire Canadian landmass and contains the features normally found on topographic maps at scales of 1:50,000 and 1:250,000. These include hydrography, hypsography (contours), vegetation, the road network, the rail network, the electric power network, designated areas, land form, wetlands, and manmade features.

The NTDB is highly useful in both map production and geographic information systems (GIS). Listed below are links to GIS-ready index layers of 1:50,000 and 1:250,000 maps in the Great Lakes basin.

Map Index Layers – Great Lakes Basin

ArcView shapefiles showing the boundaries of all maps which include a portion of the Great Lakes basin.

Great Lakes Basin NTDB Map Boundaries – 1:50,000 (ZIP file)

Great Lakes Basin NTDB Map Boundaries – 1:250,000 (ZIP file) 

United States: Coastal Wetlands Inventory – Great Lakes Region

The following image depicts the extent of coastal wetlands inventory coverage by source for the Great Lakes region, as currently held by the Great Lakes Commission. The inventory contains information at various levels (depending on source) on the characteristics, extent, and status of wetlands and deepwater habitats. The inventory data are indexed by USGS 7.5-minute topographic quadrangle.