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《Geomatics World》 2017-01
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A Modified TIN-Based Li DAR Data Encryption Gradually Filtering Algorithm

YUE Guichang;ZHOU Yujuan;Henan Electric Power Survey & Design Institute;  
This paper proposed a modified filtering method based on in-depth study of the original Triangulated Irregular Network(TIN) algorithm. It improves the credibility of the initial surface by constructing the grid to generate the ground seed points. When selecting the tetrahedron vertices threshold in the upward encryption process, it used adaptive threshold based on the local terrain gradient to overcome the limitation of single threshold in original algorithm. Experiments show that the modified algorithm can effectively reduce the three types of errors, including type I error reduction of 50%; type II error of 30%; the total error of 40%.
【CateGory Index】: TN958.98
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