CDED (Canadian Digital Elevation Data)

Description

CDED provides gridded digital terrain data for Canada at 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) from 0.75 to 1.5 to 3 arcseconds for the 1:50K data and from 3 to 6 to 12 arcseconds for the 1:250K data. Elevations are stored as signed 2-byte integers, in units of meters relative the mean sea level, based on the North American Datum 1983 horizontal reference datum (GRS 80 ellipsoid).

Data Source

Centre for Topographic Information (CTI) of Natural Resources Canada (NRC)

Data Availability

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. Current pricing is available online.

Web Site

Center for Topographic Information (Canada): http://www.cits.rncan.gc.ca

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