hachure

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hachure

shading of short lines drawn on a relief map to indicate gradients

hachure

[ha′shu̇r]
(mapping)
A short line used to denote slopes of the ground, as on maps.

hachure

One of a series of parallel lines drawn on topographic maps in the direction of the slopes of hills or depressions to indicate relief features. The steeper the slopes, the heavier and more closely spaced the hachures become.
References in periodicals archive ?
22) Two developments were crucial: indirectly, the invention of the contour line (curved lines of equivalent elevation first used to show the overall form of landmasses on a French map of (1791) and, directly, Johann Georg Lehmann's 1799 invention of shadow-hachures, an arrangement of hachures that emphasized the "transition from level ground to steep gradients.
A tangle of squiggles denoting either a river or a slope face of indeterminate orientation touches the arc of the road symbol before it disappears into the dark interlineations of letters and hachures on the way to Italy.
The application developed for this paper and described in the section "Creating and Rendering Geometry" applies Imhof's rules to the rendering of hachures with respect to local slope and illumination characteristics.
On a planimetric map, hachures are linear symbols drawn perpendicular to contours and represent paths of steepest slope across a surface patch.
The first technique, rendering hachures as lines of steepest slope, adds reasonable slope information to a landscape illustration rendering hut does not imitate typical manual practice.
The second strategy, represented by algorithm Build Slope Lines, extends Build Hachures with a recursive technique that still renders hachures as straight lines but limits their rendering to triangles falling within a specified topological distance from a crease.