International Journal of Advanced Research and Publications (2456-9992)

Drone-Based DSM For Multiscale Geometrical Characteristics Of Ephemeral Gullies.

Volume 3 - Issue 7, July 2019 Edition
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Author(s)
Jean A. Doumit, Souhail F. Awad
Keywords
drone, ephemeral gully, CTI, DSM, Multi-scale.
Abstract
The advance uses of drones in geosciences by producing very high spatial resolution Digital Surface Models (DSMs) and Digital Ortho Models (DOM), at various flight heights, led to different digital models scales. Relief plays an important role in the formation of Ephemeral Gullies (EG), this study focuses on the prediction of multiscale EG location using the compound topographic index (CTI) and analyzed their geometrical characteristics as length, depth and volume of the three different spatial resolutions DSM processed from different drone flights height. Ephemeral Gully extracted from the three flight heights of 120, 240 and 360 meters were compared with each other to understand the effect of generalization at different scales. The results highlight the presence of two scales, small scale ephemeral gully expressed by the flight height 240 and 360 m and a much smaller scale in the level of micro relief of the flight height 120 m.
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