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.
References in classic literature ?
Another onfall we may withstand, but they are many and we are few, so that the time must come when we can no longer form line across the hill.
At first the tumult of my own thoughts, summoned by the danger-signal and swarming to the rescue from every quarter of my skull, kept up such a hurrah and confusion and fifing and drumming that I couldn't take in a word; but presently when my mob of gathering plans began to crystallize and fall into position and form line of battle, a sort of order and quiet ensued and I caught the boom of the king's batteries, as if out of remote distance:
Possibly enough she was merely borrowing a common form line from some earlier poet--or poetess--for this is a woman's line rather than a man's.
When soldiers form lines, or hollow squares, you call it reason.
racecourses the letter F Folkestone Plumpton Nigel Twiston-Davies' Splash Of Ginge looks exposed at this level, while there is a form line with Grumeti that gives Irish Saint the edge.
Sariska ran second to Fame And Glory last year, so looking at that form line, Midday shouldn't be too far away.
The dense triangulation produced from the tessellated vertices, combined with an appropriate initial form line width, provides a smooth shading gradient from steep and shadowed regions to those that are flat and directly illuminated.
Broadstreet were no match for Caldy a fortnight ago and a form line would give Caldy a easy win.
Noel Meade's Casey Jones has been running well and should again be in the frame, but on a form line through Orge d'Ete he looks well and truly held by the selection.
A form line through Kalanisi suggests that French raider Dansili may have the edge.
A clutch of two-year-olds with impressive Ascot form line up for the Dragon Stakes (3.
A feature called Tax Link Assistant assigns these categories to the right tax form line.