form line

[′fȯrm ‚līn] (mapping) An approximation of a contour line without a definite elevation value, as one derived by visual observation, sometimes supplemented by measured elevations but not in sufficient quantity to produce accurate results; used principally to indicate the appearance of terrain which has not been accurately surveyed.

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.

单词	form line
释义	form line form line [′fȯrm ‚līn] (mapping) An approximation of a contour line without a definite elevation value, as one derived by visual observation, sometimes supplemented by measured elevations but not in sufficient quantity to produce accurate results; used principally to indicate the appearance of terrain which has not been accurately surveyed. 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.
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