Fig. 5
From: Fusion of high-resolution DEMs for water flow modeling
Effect of DEM fusion on water flow patterns. Figure a shows the boundaries of DEMs used for fusion. High crops in June DSM (b) create artificial barriers to water flow resulting in ponding (zone c) and lower water depth in a forming rill in zone b comparing to DEMs derived from two other sources (c and d). Comparing the fused DEM with blended overlaps (d), flow simulation on the DEM derived by simple patching of all DEMs (c) results in depressions at the edge of the DEMs where water accumulates (zone a and d). See Table 1 to compare the simulated amount of water in these zones between different DEMs. Lines 1 and 2 represent profiles from Fig. 4. The azimuth of the light source for shaded relief is 270° and the altitude angle is 30°