They gather data about the features of land and water areas. Using reference points, they measure lines, elevation contours, and distances between points. Also, they make legal descriptions for deeds and leases. Surveying includes many special fields. Land surveyors establish and mark property lines.
Marine surveyors map shorelines and depths of water bodies.
Engineering surveyors survey sites of buildings, roads, sewers, and other projects. Geodetic surveyors set reference points for use by other surveyors. Surveyors work for private surveying or engineering firms. Many work for state or local highway departments. Some are self-employed.