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      <marc:subfield code="a">Canadian Digital Surface Model : </marc:subfield>
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      <marc:subfield code="a">Edition 1.1.</marc:subfield>
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      <marc:subfield code="a">Sherbrooke, Quebec, Canada : </marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Modèle numérique de surface du Canada : spécifications de produit.</marc:subfield>
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      <marc:subfield code="a">"These product specifications apply to the Canadian Digital Surface Model (CDSM). The CDSM is part of Natural Resources Canada's altimetry system designed to better meet the users' needs for elevation data and products. … The CDSM plays a role comparable to that of contours and relief shading on conventional paper maps. The CDSM serves as key data in a range of applications including: the rendering of three-dimensional visualizations, the creation of relief maps; telecommunication studies, line of sight analysis, flight simulation, and viewshed analysis and visualization"--Overview, page 1.</marc:subfield>
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      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2025/rncan-nrcan/M114-42-2013-eng.pdf</marc:subfield>
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