Abstract: The topography changes with time. The slope map is made with high-precision EDE data, and then the ridge coefficient is calculated, which can more accurately calculate and count the cultivated land area. Based on the DEM data generated from the 2 m grid point cloud data, according to the relevant technical requirements of the third national land survey and the gradient classification requirements of cultivated land, the gradient classification grid data map is generated. Vectorize the gradient classification grid data map, generate the gradient classification vectorization data. Integrate the map spots, smooth the boundary, reconstruct the topology, and deal with the vectorization data according to the cutting and other processing, the slope map and relevant attribute data of the survey area are made. At the same time, the results of slope map production are analyzed, and the technical differences of slope map produced by different scale grid are obtained, and the application of high-precision slope map is prospected.

Key words: 2 m grid, DEM, slope map, the third land survey, technological disparity