form line

form line
Lines resembling contours, but representing no actual elevations, that have been sketched from visual observation, or from inadequate or unreliable map sources, to show collectively the configuration of the terrain. Whereas contours are drawn as continuous lines, the form lines are drawn as dotted or broken lines.
Form lines are broken/dotted lines and sketched from visual observations.

Aviation dictionary. 2014.

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  • Line conch — Line Line, n. [OE. line, AS. l[=i]ne cable, hawser, prob. from L. linea a linen thread, string, line, fr. linum flax, thread, linen, cable; but the English word was influenced by F. ligne line, from the same L. word linea. See {Linen}.] 1. A… …   The Collaborative International Dictionary of English

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