Comparison of DEM data capture and topographic wetness indices.

摘要: Digital elevation models (DEMs) can be captured and analysed by various methods. Elevation capturing with RTK-GPS airborne laser scanning is presented evaluated in terms of height accuracy raw data interpolated DEMs for study sites Sweden Germany. Applications precision agriculture are based on the connection land surface movement water landscape. Three methods deriving potential flow accumulation from discussed. Results indicate that Topographic Wetness Index used to assess pattern soil moisture a field changes texture caused erosion processes. The quality assessment varies both algorithm terrain characteristics. Correlations up r2 = 0.64 were found. Best results obtained undulating farmland using DEMON formbased approach. However, areas low relief, concept did not lead valuable maps.