The Topography Of The Points And Lines Based On Dem Skeleton Features Comprehensive Study

Relief Automated Generalization is a higher degree of difficulty the issue, also is one of the greatest challenges of the research project, become the development of GIS affect one of the reasons. In this paper, from a new method and perspective, discuss and study the Relief Automated Generalization based on DEM.It is a new approach to explore Relief Automated Generalization, based on DEM skeleton characteristic point and line to automate generalize relief, through the extraction DEM terrain skeleton characteristics of the data to automate generalize relief. Based on the Loess Plateau drainage area of Chabagou DEM data sources, extract the skeleton characteristics point and line of DEM, To achieve a linear data into discrete point set of data, and then grade of them, through the control point set the spatial distribution of data density, configurative different level of TIN, which build DEM, achieved the relief generalization from the 1:10000 DEM to the 1:50000 DEM. Finally, evaluate the generalize result of the 1:50000 DEM in elevation accuracy and terrain parameter according to the original 1:50000 contours and 1:50000 DEM.The result shows that based on DEM skeleton characteristic point and line to automated generalize relief, the generalize result of the 1:50000 DEM has a high accuracy, and achieve second level of the accuracy criteria of national 1:50000 DEM, it's terrain parameter frequency spectrum also has a highly correlation with the terrain parameter frequency spectrum derived from the national 1:5 0000 DEM, and contrast to the resampling of 1:50000 DEM, it has a higher accuracy. Based on DEM skeleton characteristic point and line to automated generalize relief, to some extent, it improve and perfect of the relief automated generalization based on DEM and establish the foundation for relief automated generalization and the research.