The Reconstruction and Applications of the Contour Lines Based on TINs

Zhiwei Wang 1, Changqing Zhu 1, 2 and Yaoge Wang 1
1 Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052, China
2 Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Nanjing 210054, China

Abstract: In this paper, the principle of contour interpolation is introduced firstly. And then, we deduce the propagation formula of the horizontal accuracy of the interpolated contour lines, and discuss the accuracy of interpolated contours on triangulated irregular networks with different constrained conditions and find that the quality of the contours interpolation is relative closely with the quality of triangulated irregular networks. At last, the interpolated contours are applied into two practical applications, which are the auto-connecting of the discontinuous contours and the Chinese-English metric unit conversion of the contours. The experiments indicate that the reconstructed contours based on the triangulated irregular networks can satisfy the different accuracy of the two applications.

Keywords: triangulated irregular network (TIN), DEM, accuracy, quality, contour line, breakpoint connection, unit conversion, error analysis

In: Wan, Y. et al. (eds) Proceeding of the 8th international symposium on spatial accuracy assessment in natural resources and environmental sciences, World Academic Union (Press).

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