CDED (Canadian Digital Elevation Data)
CDED provides gridded digital terrain data for Canada at map scales of 1:50K and 1:250K. The file format for this data is virtually identical to the USGS standard ASCII format, and can be imported into RiverTools as USGS Standard Format. Grid spacing at both scales is based on Geographic coordinates and varies with latitudinal zone (A, B, or C). Zone A consists of all latitudes less than 68 degrees north. Zone B consists of latitudes between 68 and 80 degrees north. Zone C consists of latitudes between 80 and 90 degrees. The spans of tiles are designed so that every tile has 1201 columns and 1201 rows, regardless of map scale or latitude zone.
How to Import
Choose Import DEM → USGS Standard ASCII from the File menu and then select the file, which will usually have the filename extension ".dem".
Centre for Topographic Information (CTI) of Natural Resources Canada (NRC)
Data at the 1:250K scale is available for the entire country, while data at the 1:50K scale provides only partial coverage, mainly in regions with significant economic activity. DEMs for Canada can now be downloaded from the GeoGratis website hosted by Natural Resources Canada.
Natural Resources Canada Main Page: http://www.nrcan.gc.ca/home
Download DEMs from GeoGratis: http://www.geogratis.gc.ca/geogratis/search?lang=en
Center for Topographic Information (Canada): http://www.cits.rncan.gc.ca
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