Estimate the Accuracy of DEM Based on Reconstructed Contours

Considering rasterizing contours—line-by-line scanning the original contour and the reconstructed one,and marking the area of the original contour and the reconstructed one by different numbers,we estimate the accuracy of DEM of TIN and grid which based on reconstructed contours,and make conclusion about the relation between different grid distances and accuracy of DEMs,then evaluate the degree of the DEM was consistent with the terrain relief.