Definition:
Land surveying deals with the measurements of land and its physical features accurately, and the recording of these features on a map. It is concerned with three main activities, namely measurement of length, levelling, and angular measurements. Land surveying comprises geodetic surveying, topographic surveying, photogrammetry, cadastral surveying, hydrographic surveying and engineering surveying.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO-SAFR, 2002, Irrigation Manual Module 2, Natural Resources Assessment, By: Andreas Savva & Karen Frenken