Note on the method used by the institiut geographique national in compiling the map of the Saharan Regions on the scal 1:200,000
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1963-06Author(s)/Corporate Author (s)
United Nations. Economic and Social Council;United Nations. Economic Commission for Africa;
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The preparation of maps by aerial stereophotogrammetry, a method now used almost exclusively throughout the world on all so-called "topographical" scales, necessitates knowledge of-the co-ordinates and altitudes of a certain number, of landmarks identifiable on the photographs. At the plotting stage these marks are necessary because the position and bearing parameters of the places .cannot be determined with the desired degree of precision at the time the photographs are taken.
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“United Nations. Economic and Social Council; United Nations. Economic Commission for Africa (1963-06). Note on the method used by the institiut geographique national in compiling the map of the Saharan Regions on the scal 1:200,000. UN. ECA Regional Cartographic Conference for Africa (1963 July 1-13: Nairobi , Kenya). Addis Ababa :. © UN. ECA,. https://hdl.handle.net/10855/7645”Conference
UN. ECA Regional Cartographic Conference for Africa (1963 July 1-13: Nairobi , Kenya)Collections
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