Land surveyors establish official land, air space, and water boundaries.
Survey technicians , assist land surveyors by operating survey instruments and collecting information. Mapping scientists and other surveyors collect geographic information and prepare maps of large areas. Land surveyors manage 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 important features in the survey area. Surveyors research legal records and look for evidence of previous boundaries.