TIN-DDM terrain complexity measurement method considering topographic forms differences

doi:10.11947/j.AGCS.2023.20220074

Abstract

Abstract: Terrain complexity is a comprehensive parameter in the research field of seabed topographic forms, and reasonable construction of TCI calculation model is one of the important links to measure the changes of DDM surface topography. At present, the TCI calculation models established by the TIN-DDM terrain complexity measurement method cannot well reflect the difference in the topographical change characteristics between different terrain units where they are located by comparing the TCI values of the sampling points, and aiming at this problem, this paper proposes a TIN-DDM terrain complexity measurement method fully considering topographic forms differences. On the basis of analyzing the principle of rolling ball transformation, this method clarifies the correlation between the depth change of the sampling point and its TCI in the process of TIN-DDM rolling ball transformation, analyzes the selection principle of the optimal rolling ball radius, constructs the sampling point TCI calculation model and optimized it. Finally, an effective measure of the terrain complexity of TIN-DDM is realized by means of TCI interpolation of complex fields. The experimental results show that this method has a good effect of measuring terrain complexity, the constructed TCI calculation model can better distinguish the difference of local terrain topography expressed by sampling points. Compared with the comparison method, the DDM reconstructed by TCI according to the method in this paper has higher accuracy.

Key words: terrain complexity, TCI calculation model, TIN-DDM, rolling ball transformation, complex field, DDM reconstruct

CLC Number:

P227

JI Hongchao, DONG Jian, LI Shujun, ZHANG Zhiqiang, TANG Lulu. TIN-DDM terrain complexity measurement method considering topographic forms differences[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(6): 1010-1021.

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