By calculating the steepness of the slope, these images can be used as the basis for assessing slopeland development. By calculating where the ridge lines are, watershed areas can be identified. By identifying valleys, the images can be helpful to mapping out water catchment areas.
如果算出坡度，可以做為山坡地開發的依據；算出山脊線，可以看出分水嶺；列出山谷線，對於集水區的規劃有幫助。