This statement covers three groups of workers who measure and map the earth's surface.
Land surveyors establish official land, air space, and water boundaries.
They are assisted by survey technicians, who operate surveying instruments and collect information. Mapping scientists and other surveyors collect geographic information and prepare maps and charts of large areas. Land surveyors manage one or more survey parties that measure distances, directions, and angles between points and elevations of points, lines, and contours on the earth's surface. They plan the fieldwork, select known survey reference points, and determine the precise location of all important features of the survey area. They research legal records and look for evidence of previous boundaries.