00000nam 2200000zi 4500 9.895005 CaOODSP 20221107173913 m o d f cr bn||||||||| 210104e198202 oncab obt f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- Co24-3/7-1353-1982E-PDF Whitteker, J. H. (James Howard), 1940- author. The CRC topographic data base / by J.H. Whitteker. Ottawa : Communications Research Centre, February 1982. 1 online resource (vii, 57 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier CRC report ; no. 1353 "Radar and Communications Technology Branch." Digitized edition from print [produced by Innovation, Science and Economic Development Canada]. Some pages rotated in this copy. Includes bibliographical references (page 36). "A data base of terrain elevations and surface types has been compiled, primarily to provide input data for radio-wave prediction programs. The data have been derived by hand-scaling 1:50000 scale topographic maps. An elevation and a surface code (forest, lake, etc.) is stored for each point in a square array with 500 metre spacing. The data reside on computer disk, and are organized for rapid access. The usual method of obtaining information from the data base is by means of a Fortran subroutine that provides elevations and surface codes at 500 m intervals along any specified great-circle path within the data-base area. The elevations may also be plotted on an ordinary (alphanumeric) computer terminal"--Abstract, page 1. Issued also in print format. Land cover Canada Databases. Occupation du sol Canada Bases de données. Canada Altitudes Databases. Canada Altitudes Bases de données. Communications Research Centre (Canada), issuing body. CRC report ; no. 1353. (CaOODSP)9.882492 PDF 1.23 MB https://publications.gc.ca/collections/collection_2021/isde-ised/co24/Co24-3-7-1353-1982-eng.pdf