Nan HUANG, Xin YANG, Hailong LIU. A Method of Saddle Point Extraction based on Contour Spatial Relationship [J]. Journal of Geo-information Science, 2020, 22(3): 410
- Journal of Geo-information Science
- Vol. 22, Issue 3, 410 (2020)
Fig. 1. The schematic diagram of the topological relationship between saddle point and contour
Fig. 2. Process of saddle point extraction
Fig. 3. The schematic diagram of contour plane from contour and outermost contour
Fig. 4. Flowchart of the saddle point extraction based on topological relationship
Fig. 5. The schematic diagram of determination of saddle point spatial location
Fig. 6. Locations of study areas and study data
Fig. 7. Comparison of the results of saddle point extraction in study sample area 1
Fig. 8. Relationships between the extraction quantity of saddle points and contour interval
Fig. 9. The schematic diagrams of contour data with different contour interval containing different numbers of peaks
Fig. 10. Comparison of spatial positions of saddle points extracted by contour data with different contour interval
Fig. 11. Comparison of extraction results of different methods in study area 1
Fig. 12. Comparison of extraction results of different methods in study area 1
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Table 1. Accuracy statistics of the saddle point extraction
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Table 2. Statistics of incremental buffering algorithm extraction of saddle point
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Table 3. Comparison of saddle points extracted by different methods in the study area
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