2.In this dissertation, focused on the aerial image matching based terrain data acquisition and DEMs based digital terrainanalysis, some theory, approach and key technical problem of digital terrain modeling are discussed.
3.Digital TerrainAnalysis (DTA) is a topographical information analysis technology to calculate and extract terrain surface parameters and morphological features on Digital Elevation Model(DEM), and the application of DEM is extended by DTA.
4.5. Using C++ language and OpenGL Graphic Library to implement the algorithm of 3D terrainanalysis and terrain visualization, and this algorithm has become part of vega3DGIS.
5.the DEMs based digital terrainanalysis approaches are investigated, among which the emphasis is put on the topographic structure extraction based on grid DEMs.
6.The conversion between Grid DEMs and TINs is of critical significance in digital terrainanalysis which is a key work in the watershed planning of the loess plateau region.
