Tōp/o-grāph'ie or Tōp/o-grāph'ie-al, a.

a. [Fr. topographique.] Of, or pertaining to, topography; descriptive of a place.

Topographical surveying, that branch of surveying which pertains to the process of ascertaining and representing upon a plane surface the contour or figure of any portion of the surface of the earth.