00000000nam 2200000zi 4500
0019.892199
003CaOODSP
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006m     o  d f      
007cr |n|||||||||
008201006s1992    oncb    ob   f|0| 0 eng d
040 |aCaOODSP|beng|erda|cCaOODSP
041 |aeng|bfre
043 |an-cn---
0861 |aCo24-3/7-92-002E-PDF
1001 |aWhitteker, J. H. |q(James Howard), |d1940- |eauthor.
24510|aStorage specifications for 500-metre-grid terrain data / |cby J.H. Whitteker.
264 1|aOttawa : |bGovernment of Canada, Department of Communications = Gouvernement du Canada, Ministère des Communications, |c1992.
300 |a1 online resource (24 pages) : |bmaps.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCRC report ; |vCRC-RP-92-002
500 |aDigitized edition from print [produced by Innovation, Science and Economic Development Canada].
500 |a"August 1992."
504 |aIncludes bibliographical references (page 14).
520 |a"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.
546 |aIncludes abstract in French.
650 0|aTopographic maps|xData processing.
650 6|aCartes topographiques|xInformatique.
7101 |aCanada. |bDepartment of Communications, |eissuing body.
830#0|aCRC report ;|vCRC-RP-92-002.|w(CaOODSP)9.882492
85640|qPDF|s3.03 MB|uhttps://publications.gc.ca/collections/collection_2020/isde-ised/Co24/Co24-3-7-92-002-eng.pdf