That branch of applied mathematics which teaches the art of determining the area of any portion of the earth's surface, the length and directions of the bounding lines, the contour of the surface, etc, with an accurate delineation of the whole on paper; the act or occupation of making surveys. Geodetic surveying, geodesy. Maritime, or Nautical, surveying, that branch of surveying which determines the forms of coasts and harbors, the entrances of rivers, with the position of islands, rocks, and shoals, the depth of water, etc. Plane surveying. See Plane, topographical surveying, that branch of surveying which involves the process of ascertaining and representing upon a plane surface the contour, physical features, etc, of any portion of the surface of the earth.