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Remote Sensing for Land & Resources    2019, Vol. 31 Issue (1) : 87-94     DOI: 10.6046/gtzyyg.2019.01.12
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Study and application of sequential extraction method of ground fissures based on object
Xinghang ZHANG1,2, Lin ZHU1,2(), Wei WANG3, Lishan MENG3, Xiaojuan LI1,2, Yingchao REN4
1.College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
2.Laboratory Cultivation Base of Environment Process and Digital Simulation, Beijing 100048, China
3.Laboratory of Non-fossil Energy Minerals,Tianjin Center of China Geological Survey, Tianjin 300170, China
4.The State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
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Abstract  

The automatic extraction technology of regional scale ground fissures based on remote sensing images has the problem of low spectral range and low geometric feature, which leads to low extraction precision. Therefore, the sequential step extraction method for ground fissures based on objects is proposed. Firstly, the image is segmented. According to the spectral and geometric characteristics of segmentation object, surface interference factors which are different from the ground fissures are removed by mask. On such a basis, the linear objects are extracted and the surface factors without linear features are removed ultimately. Finally, the fractal characteristics of linear objects are calculated to differentiate between the ground fissures and other linear surface factors and complete the automatic extraction of ground fissures. The method was applied to the extraction of ground fissures in a coal-mining region of northeastern Ordos. The results show that the method is effective in extracting the ground fissures. Its accuracy reaches 85.7%, which is better than the precision of traditional supervised classification method (57.1%) and the precision of knowledge model extraction method (71.4%) . On the basis of extraction results, this paper discusses the distribution characteristics of ground fissures. The respective relations between ground fissures and the location of goafs as well as topography are analyzed. The results show that the number of ground fissures is negatively correlated to the distance of goafs and is not clearly correlated to the topography. The research can provide the necessary technical support for the regional geological environment protection and the rational exploitation of coal resources in the mining area.
Keywords GeoEye image      ground fissures      sequential extraction      feature extraction     
:  TP79  
Corresponding Authors: Lin ZHU     E-mail: zhulin@163.com
Issue Date: 15 March 2019
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Xinghang ZHANG
Lin ZHU
Wei WANG
Lishan MENG
Xiaojuan LI
Yingchao REN
Cite this article:   
Xinghang ZHANG,Lin ZHU,Wei WANG, et al. Study and application of sequential extraction method of ground fissures based on object[J]. Remote Sensing for Land & Resources, 2019, 31(1): 87-94.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2019.01.12     OR     https://www.gtzyyg.com/EN/Y2019/V31/I1/87
Fig.1  Location of study area
Fig.2  Flow chart of proposed method
Fig.3  Results of different segmentation scales
Tab.1  Spectral threshold range of ground fissure
Tab.2  Geometric feature threshold range of ground fissure
Fig.4  Results of mask processing
Fig.5  Comparison of Canny operator linear extraction
Fig.6  Results of linear feature extraction in test area
Fig.7  Results of ground fissures extraction in test area
Fig.8  Supervised classification and knowledge model extraction results in test area
提取方法 正确提
取数/条		 错误提
取数/条		 提取总
数/条		 实际总
数/条		 正确提
取率/%		 错误提
取率/%
本文方法 6 2 8 7 85.7 28.6
监督分类方法 4 6 10 7 57.1 85.7
知识模型方法 5 5 10 7 71.4 71.4
Tab.3  Accuracy assessment results of ground fissure extraction in test area
Fig.9  Results of ground fissures extraction in study area
Fig.10  Direction of crack in study area
缓冲区距离/m [0,50) [50,100) [100,500) ≥500
地裂缝数/条 6 2 1 1
Tab.4  Result of the amount of ground fissures located in different buffer zone of coal mining
等高线/m [0,1 350) [1 350,1 400) [1 400,1 450) ≥1 450
地裂缝数/条 0 3 3 4
Tab.5  Result of ground fissures number in different buffer zone of topography
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