摘要
利用三维激光扫描仪获取的空间数据,进行三维实景构建研究。首先对扫描仪获取的数据按照基于格网的方法进行压缩,然后对压缩后的数据建立三角网数字地面模型,最后将原始空间数据按照一定的拓扑结构映射到二维球面(α,θ面)并在α,θ面等角划分形成二维矩阵,以落在矩阵各栅格内的点云强度均值作为该处像素值以图像形式显示,再同实际影像比较,选出同名点,根据摄影测量后方交会原理计算得到影像的内外方位元素,由得到的内外方位元素计算出相应的纹理坐标,完成纹理映射过程。文中以Trimble地面三维激光扫描仪为例以地物作为采集对象,用Visual Studio 6.0作为开发平台进行三维实景构建。
Based on the spatial data captured via a 3D laser scanner, a study of constructing 3D true object is presented. First, the data need to be compressed according to the method based on grid; second, construct a triangulation irregular net with the compressed data; last, map the original spatial data to the two dimension（α,θ） in a certain topological structure. And the elements of interior and exterior orientation will be obtained according to the Resection Theory of Phototopography after choosing corresponding image points from the picture and a real photo. Then the texture coordinates are obtained to accomplish the texture mapping process with the elements calculated before. Trimble laser scanner is used to collect data and Visual Studio 6.0 as the development platform to construct the 3D true object.
出处
《测绘工程》
CSCD
2013年第1期81-85,共5页
Engineering of Surveying and Mapping
关键词
数据压缩
不规则三角网
空间后方交会
纹理映射
data compression
triangulation irregular net
space resection
texture mapping
