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Plain surveying means the survey in which earth surface is considered as to be flat or plain i.e. its curvature is ignored.
Geodetic survey is the survey in which curvature of the earth is taken into count and then surveying is done.
Rudi Geodetic Point was created in 2006.
geodetic
Geodetic azimuth is when you measure in a Brunton compass from 0 to 360 degrees clockwise.
U.S. National Geodetic Survey was created in 1807.