一种重构数字地形模型方法研究

提出了一种从CAD的DXF图形接口文件中提取地形等高线图元几何数据、应用层次B样条逼近算法对大规模散乱数据作曲面拟合来重构三维地形模型的方法,并研发了实现软件.解决了直接由CAD地形图建立地形模型的问题,为利用已有资料提供了有效途径.

Study on A Reconstruction Method of Digital Elevation Model

The reconstruction of Digital Elevation Model(DEM) is a new way that processing and re-building the 3-D model by computer. To re-build DEM, the customary way is based on a great deal of data. However, it is difficult to collect so many data. The new model is derived and the related software is developed for the reconstruction of 3-D topographic model in this paper. The data of contour is obtained from the AUTOCAD-DXF graphical interface files. The algorithm for surface fitting of scattered measured data using multilevel B-Spline approximation is applied. This resolution provides a good way to make good use of known information and saves production cost. According to the test results, this method turns out to be a good resolution of complex 3-D model reconstruction.