A semi-automatic model for sinkhole identification in a karst area of Zhijin County, China

Hao Chen; Takashi Oguchi; Pan Wu

doi:10.1117/12.2207433

9 December 2015 A semi-automatic model for sinkhole identification in a karst area of Zhijin County, China

Hao Chen, Takashi Oguchi, Pan Wu

Proceedings Volume 9808, International Conference on Intelligent Earth Observing and Applications 2015; 98080Q (2015) https://doi.org/10.1117/12.2207433
Event: International Conference on Intelligent Earth Observing and Applications, 2015, Guilin, China

Abstract

The objective of this study is to investigate the use of DEMs derived from ASTER and SRTM remote sensing images and topographic maps to detect and quantify natural sinkholes in a karst area in Zhijin county, southwest China. Two methodologies were implemented. The first is a semi-automatic approach which stepwise identifies the depression using DEMs: 1) DEM acquisition; 2) sink fill; 3) sink depth calculation using the difference between the original and sinkfree DEMs; and 4) elimination of the spurious sinkholes by the threshold values of morphometric parameters including TPI (topographic position index), geology, and land use. The second is the traditional visual interpretation of depressions based on the integrated analysis of the high-resolution aerial photographs and topographic maps. The threshold values of the depression area, shape, depth and TPI appropriate for distinguishing true depressions were abstained from the maximum overall accuracy generated by the comparison between the depression maps produced by the semi-automatic model or visual interpretation. The result shows that the best performance of the semi-automatic model for meso-scale karst depression delineation was using the DEM from the topographic maps with the thresholds area ⪆ 60 m², ellipticity ⪆ 0.2 and TPI ≤ 0. With these realistic thresholds, the accuracy of the semi-automatic model ranges from 0.78 to 0.95 for DEM resolutions from 3 to 75 m.

Citation Download Citation

Hao Chen, Takashi Oguchi, and Pan Wu "A semi-automatic model for sinkhole identification in a karst area of Zhijin County, China", Proc. SPIE 9808, International Conference on Intelligent Earth Observing and Applications 2015, 98080Q (9 December 2015); https://doi.org/10.1117/12.2207433

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