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A combined contour lines iteration algorithm and Delaunay triangulation for terrain modeling enhancement

Geo-Spatial Information Science 2023年第3期26卷 558-576页

作者： Yehia Miky Abdullah Kamel ahmed alshouny Department of Geomatics King Abdul aziz UniversityJeddahSaudi Arabia Faculty of Engineering Aswan UniversityAswanEgypt National Water Research Center Survey Research InstituteGizaEgypt

Digital Elevation Models(DEMs)play a crucial role in civil and environmental applications,such as hydrologic and geologic analyses,hazard monitoring,natural resources exploration,***,DEMs can be generated from various data sources,such as ground surveys,photogrammetric stereo methods,satellite images,laser scanning,and digitized contour *** with other data sources,contour lines are still the cheapest and more common data source becausethey cover all areas,at different scales,in most *** there are different algorithms and technologies for interpolation in between contour lines,DEMs extracted solely from contours still suffer from poor terrain quality representation,which in turn negatively affects the quality of analytical applications *** this paper,an approach for improving the digital terrain modeling based on contour line densification and Delaunay triangulation is presented to acquire a more suitable DEM for hydrographic modeling and its *** proposed methodology was tested using a variety of terrain patterns in terms of intensity:hilly,undulated,and plain(1:25,000 topographic map,5 m contour interval).The precision of the extracted GRID model increases as the number of added contours *** four contour lines,the Root Mean Square Error(RMSE)of examining points were 0.26 m,0.29 m,and 0.05 m for hilly,undulated,and plain samples,respectively,and the Mean Absolute Error(MAE)were 0.50 m,0.48 m,and 0.17 *** convergence probabilities between extracted and original flow lines for the same regions were 96.91%,94.93%,and 84.03%.Applying the methodology,experimental results indicate that the developed approach provides a significant advantage in terrain modeling enhancement,generates DEMs smoothly and effectively from contours,mitigates problems and reduces uncertainties.

关键词： Contours Digital Elevation Model(DEM) Triangulated Irregular Network(TIN) Delaunay triangulation

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