An A-frame is a tool used to determine landscape contour. It is simple and cheap to make, and appropriate to situations where other contour-mapping tools such as LiDAR or GPS are unavailable, impractical, or prohibitively expensive. It consists of three straight rods or planks, fastened together in the shape of a capital "A", with a plumb bob (weight) suspended from the apex. Markings on the cross-piece are compared to the plumb bob line to determine slope.

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Authors Ethan
License CC-BY-SA-3.0
Language English (en)
Related 0 subpages, 3 pages link here
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Created April 2, 2016 by Ethan
Modified March 2, 2022 by Page script
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