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Remote Sensing for Natural Resources    2025, Vol. 37 Issue (6) : 148-155     DOI: 10.6046/zrzyyg.2024345
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Extracting information on benches in open-pit coal mines based on Sentinel-2 images and the BenchSegNet model
LI Kaixuan(), LIU Junwei, WANG Zhibo, JIANG Wenlong, CAI Hanlin, LEI Shaogang, YANG Yongjun()
School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
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Abstract  

Benches, important surface features in open-pit coal mines, can reflect the production status in the mines. Extracting information about benches from remote sensing images can provide a significant basis for production monitoring in coal mines, as well as ecological protection and restoration. This study established the BenchSegNet deep learning model for extracting information on benches in open-pit coal mines from Sentinel-2 images. The results indicate that the BenchSegNet model inherited the strong generalization capability of SegFormer and the powerful detail extraction ability of U-Net, achieving an accuracy of 97.69%. Compared to the SegFormer model, the BenchSegNet model demonstrated increases of 6.19 percentage points, 4.09 percentage points, and 5.06 percentage points in precision, recall, and F1 score, respectively. Compared to two traditional convolutional neural network models, i.e., U-Net and ASPP-UNet, the BenchSegNet model exhibited increases of nearly 10 percentage points in the three metrics. In addition, compared to two traditional machine learning algorithms, i.e., random forest and support vector machine, the BenchSegNet model showed increases of approximately 15 percentage points in the three metrics. The comparisons verify that the BenchSegNet deep learning model delivers high accuracy. Given that the Sentinel-2 satellite is characterized by global coverage, short revisit time, and high spatial resolution, the combination of Sentinel-2 images and the BenchSegNet model can effectively monitor the change process of benches in open-pit coal mines.

Keywords environmental remote sensing      deep learning      open-pit coal mine      bench      SegFormer     
ZTFLH:  TP79  
Issue Date: 31 December 2025
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Kaixuan LI
Junwei LIU
Zhibo WANG
Wenlong JIANG
Hanlin CAI
Shaogang LEI
Yongjun YANG
Cite this article:   
Kaixuan LI,Junwei LIU,Zhibo WANG, et al. Extracting information on benches in open-pit coal mines based on Sentinel-2 images and the BenchSegNet model[J]. Remote Sensing for Natural Resources, 2025, 37(6): 148-155.
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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2024345     OR     https://www.gtzyyg.com/EN/Y2025/V37/I6/148
Fig.1  The technical process of this paper
Fig.2  The architecture of BenchSegNet
台阶 影像 标签 RF SVM U-Net ASPP-UNet SegFormer BenchSegNet
直线型
台阶
弯曲型
台阶
折线型
台阶
Tab.1  Comparison of bench extraction results in open-pit coal mines obtained using different methods
方法 精确率 召回率 F1分数 准确率
RF 64.56 63.33 63.94 93.71
SVM 65.32 59.11 62.06 94.60
U-Net 66.77 66.01 66.39 96.02
ASPP-UNet 66.16 69.46 67.77 96.12
SegFormer 74.74 69.38 71.96 97.20
BenchSegNet 80.93 73.47 77.02 97.69
Tab.2  Comparison of the accuracy evaluation metrics of different methods (%)
方法 精确率 召回率 F1分数
SegFormer 74.74 69.38 71.96
SegFormer+Iimage 78.04 68.11 72.74
SegFormer+U-Net 76.27 72.35 74.26
SegFormer+Iimage+U-Net(BenchSegNet) 80.93 73.47 77.02
Tab.3  The result of ablation study (%)
类型 2022年3月 2022年11月 2023年3月 2023年11月

芒来煤
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台阶提
取结果
Tab.4  Bench extraction results in the Manglai open-pit coal mine from 2022 to 2023
台阶 影像 标签 U-Net ASPP-UNet SegFormer BenchSegNet
直线型台阶
弯曲型台阶
折线型台阶
图例
Tab.5  The confidence heat maps generated by the decoders of each model
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