Datum, A reference system used to measure locations on the Earth., Total Station, An electronic instrument used to measure angles and distances., GPS (Global Positioning System), A satellite-based system used to determine precise locations., Azimuth, The angle measured clockwise from north to a point., Benchmark, A fixed reference point with a known elevation., Contour Line, A line on a map that connects points of equal elevation., Elevation, The height of a point above sea level.Elevation, Surveying, The science of measuring and mapping land, distances, and angles..

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