Dem Error Edit

DEM Edit is the key process of the DEM data produce. Based on the analysis of the DEM data Error, this paper using the lowpass filtering method to eliminate the Random Error of DEM data, using the partial slope information detection and whole trend surface detection to detect DEM Gross Error. We emphasize research with the region DEM Gross Error manual correct method at different land features, which improve the efficiency and precision of DEM Edit. Bring forward the conception of Terrain Feature Edit , at the precondition of keep the DEM data precision, Terrain Feature Edit should reflect the feature of terrain as much as possible.The main work of the paper are:1. Using lowpass filtering to eliminate the Random Error of DEM data.2. The DEM Gross Error auto detection is the key point to improve the edit efficiency of DEM data Error, using the partial slope information detection and whole trend surface detection to DEM Gross Error auto detection. Study the DEM Gross Error auto edit methods, which based on the slope information.3. The point studied the method that region edit. Based on the analysis of typical math function characteristic, bring forward the region correction method such as surface correction and line correction. Discuss the key arithmetic of surface correction and line correction in correct the DEM Gross Error of the different geography appearance such as water area, hill area and Loess Gully area.4. Bring forward the conception of keep the terrain feature of DEM Edit, and pointer solves two key technologies: The DEM data 3D fluency explores and quick pick up.