VR-GIS技术在数字黑河流域飞行模拟中的应用

以黑河流域为例,将VR-GIS技术应用在数字流域的飞行模拟中。资料预处理阶段,制作了流域Landsat TM/ETM+数字镶嵌图、DEM数据和矢量图层。利用ERDAS IMAGINE的VisualGIS模块,集成多层数据,通过人机交互进行参数设定,最终实现流域的飞行模拟。飞行模拟结果表明,从黑河上游到下游动态地俯视其沿线的地形、地貌、植被覆盖状况,浏览者可以获得比二维数字镶嵌图更为直观、生动和形象的认识。

Application of the VR-GIS Technology in the Digital Heihe River Basin Flying Simulation

This paper applies the Visual GIS technology to the flying simulation of digital river basin. It is a case of the Heihe River Basin. During the period of pre-processing the data, The mosaic image of the Heie River Basin is mapped by six Landsat ETM+ images and five Landsat TM images. All the images are geometrically co-registrated by using 1:100,000 scale topographical maps. The contour lines are digitized from one hundred and fifteen pieces of 1∶100,000 scale topographical maps. Then they are interpolated by using the ArcView Spatial Analysis for the TIN model. At last the TIN model is translated into GRID forat DEM. The Visual GIS module of the ERDAS IMAGINE is used to make the Heihe River Basin flying simulation. The data of DEM, mosaiced image and vector layers are integrated as the base data. The flyng parameters are setup by the man-machine interactive way. By using flying views, the user can undertand the landscape and detail information of the terrain, physiognomy and vegetation cover much more viually and vividly than by viewing the digital mosaiced image.