Contour lines may be either traced on a visible three-dimensional model of the surface, as when a photogrammetrist viewing a stereo-model plots elevation contours, or interpolated from estimated surface elevations, as when a computer program threads contours through a network of observation points of area centroids.
3.
It was mapped by the United States Geological Survey from surveys and U . S . Navy air photos, 1959 65, and was named by the Advisory Committee on Antarctic Names for Robert B . Forrest, a United States Antarctic Research Program photogrammetrist, surveyor and Principal Investigator for a National Science Foundation Ice Movement Study, member of the Byrd Station Traverse of 1962-63.
मोबाइल