期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B3b
页码：209-214
出版社：Copernicus Publications
摘要：We consider, in this paper, the problem of reconstructing the surface from LIDAR ground elevations. We reconstruct the surface by first rotating the LIDAR scan-lines so that they are parallel to the Y-axis, and then approximating the elevations by higher-order tensor-product B-splines using the least squared-error criterion. The resulting surface is both accurate and smooth..The approximating surface is a linear combination of tensor-product cubic B-splines. So, the coefficients of the tensor-product B-splines define the reconstructed surface. Since tensor-product cubic (quadratic) B-splines are non-zero only for four (three) knot-intervals in the x-direction and y-direction, the elevation at any point can be found in constant time and a grid DEM can be generated from the coefficients of the B-splines in time linear in the size of the grid
