Storage specifications for 500-metre-grid terrain data / by J.H. Whitteker.: Co24-3/7-92-002E-PDF
"Terrain data for much of Canada and some adjoining U.S. territory are stored compactly in a binary format. The format was designed to be used for obtaining elevations and surface type information along radio propagation paths, but it may be used whenever compact, rapidly-accessible terrain data are required. Terrain points are the intersections of a 500-metre grid defined on the UTM (Universal Transverse Mercator) co-ordinate system. A teach point, an elevation is stored, and a code indicating surface type (bare ground, tree covered, lake, sea, buildings) is also stored wherever it is available. The information for each point occupies 16 bits. A record occupies 1024 bytes, and corresponds to a 7.5 x 15.5-km rectangle. With this arrangement, points that are geographically close together are usually also close together in the data file. A file represents an area 40 of latitude by 6° of longitude. Each file contains its own index in the first six records"--Abstract.
Permanent link to this Catalogue record:
publications.gc.ca/pub?id=9.892199&sl=0
| Department/Agency | Canada. Department of Communications, issuing body. |
|---|---|
| Title | Storage specifications for 500-metre-grid terrain data / by J.H. Whitteker. |
| Series title | CRC report ; CRC-RP-92-002 |
| Publication type | Series - View Master Record |
| Language | [English] |
| Format | Electronic |
| Electronic document | |
| Note(s) | Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. "August 1992." Includes bibliographical references (page 14). Includes abstract in French. |
| Publishing information | Ottawa : Government of Canada, Department of Communications = Gouvernement du Canada, Ministère des Communications, 1992. |
| Author / Contributor | Whitteker, J. H. (James Howard), 1940- author. |
| Description | 1 online resource (24 pages) : maps. |
| Catalogue number |
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| Subject terms | Topographic maps -- Data processing. Cartes topographiques -- Informatique. |
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