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These data have been produced by photogrammetric methods and by scanning, tagging, vectorizing, and gridding of hypsographic map separates.
hypsographic map See: map, hypsographic hypsography Topography referred to the national geodetic vertical datum of 1929. The science or art of describing heights of land surfaces with reference to this datum.
 See also: Contour interval, Survey, Stereoscopic, Shoreline, Sensor
  
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