摘要
行列均匀双循环算法中参与地形绘制的顶点数量多,且存在冗余顶点,使用索引顶点数组可以避免重复存储顶点信息,提高了地形的绘制速率.通过对中巴数字卫星提供的原始遥感影像进行图像定位截取、直方图自适应均衡化、平滑线性滤波,在指定的精度下,得到指定地区的高度图.然后采用基于索引顶点数组的行列均匀双循环算法,初步完成了黄果树地区的地形绘制.
The double cycles of uniform rows and columns algorithm makes the number of vertices used for terrain render- ing is much more and exits redundant vertexes. The indexed vertex array is used to avoid the redundant vertexes＇ storage and to improve the rate of terrain rendering. The remote sensing images which received from China and Brazil Earth Resource Satellite are processed to gain the terrains＇ height fields. The processes include clipping the image in the specified position, the histogram adapting equalization, the mean filter. Theses methods can get height fields with high precision. By using the double cycles of uniform rows and columns algorithm with indexed vertex away, the rendering of the region around the Huangguoshu Falls is preliminarily realized.
关键词
三维地形场景
索引顶点数组
高度数据
遥感影像
中巴地球资源卫星
3D terrain scene
indexed vertex array
data of height field
remote sensing images
China and Brazil Earth Resource Satellite
