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Remote Sensing for Natural Resources    2021, Vol. 33 Issue (4) : 153-161     DOI: 10.6046/zrzyyg.2021027
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Information extraction technologies of iron mine tailings based on object-oriented classification: A case study of Beijing-2 remote sensing images of the Qianxi Area, Hebei Province
FAN Yinglin1,2(), LOU Debo1, ZHANG Changqing1, WEI Yingjuan3, JIA Fudong1
1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2. School of Earth Science and Resource, China University of Geosciences (Beijing), Beijing 100083, China
3. Land Satellite Remote Sensing Application Center, MNR, Beijing 100048, China
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Abstract  

The recognition and extraction of mine tailing information serve as an important step in the dynamic monitoring of the mine environment. The classification of surface features using medium-low spatial resolution images is mostly conducted based on spectral information. However, some roads and tailings have similar spectral reflectance due to the special environment in mining areas. As a result, it is liable to misclassify tailings as roads in the surface feature classification based on spectral information only, which affects the structural integrity and area statistics of tailing ponds. Given this, this paper comprehensively analyzes the spectral, shape-related, and texture characteristics of iron mine tailings in the Qianxi area, Hebei Province based on high spatial resolution images obtained from the Beijing-2 satellite and proposes an object-oriented classification method based on multiple features. The steps of the method are as follows. Firstly, perform multi-scale segmentation of Beijing-2 images and the reflectance and take the spectral differences of surface features in each band as the spectral characteristic values of surface features. Secondly, extract the values of length-to-width ratio of objects using a covariance matrix and object boundaries and take them as the characteristic values of surface feature shapes. Then, calculate the gray-level co-occurrence matrix using principal component bands, and select the contrast, correlation, and entropy values that can effectively distinguish the texture characteristics between tailings and other surface features as the texture characteristic values of remote sensing images. Finally, conduct object-oriented classification and precision assessment using the nearest neighbor method according to the characteristic information of surface features. The results indicate that the object-oriented classification method can effectively avoid the misclassification of the roads in tailing ponds and thus provide a research basis for the implementation of large-scope and high-precision identification and dynamic monitoring of mine tailings.

Keywords iron tailings      feature selection      image segmentation      object-oriented classification     
ZTFLH:  TP79  
Issue Date: 23 December 2021
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Yinglin FAN
Debo LOU
Changqing ZHANG
Yingjuan WEI
Fudong JIA
Cite this article:   
Yinglin FAN,Debo LOU,Changqing ZHANG, et al. Information extraction technologies of iron mine tailings based on object-oriented classification: A case study of Beijing-2 remote sensing images of the Qianxi Area, Hebei Province[J]. Remote Sensing for Natural Resources, 2021, 33(4): 153-161.
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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2021027     OR     https://www.gtzyyg.com/EN/Y2021/V33/I4/153
Fig.1  Location of study area
Fig.2  Fusion of panchromatic and multispectral bands
波段 空间分辨率/m 波谱范围/μm
蓝色波段 3.2 0.44~0.51
绿色波段 0.51~0.59
红色波段 0.60~0.67
近红外波段 0.76~0.91
全色波段 0.8 0.45~0.65
Tab.1  Beijing-2 spectrum information
Fig.3  Spectral curve in the study area
Fig.4  Length-width ratio of ground features
Fig.5  Extraction results of feature texture
Fig.6  The heterogeneity factor that determines the effect of multi-scale segmentation
Fig.7  Segmentation results with a compactness factor of 0.5
Fig.8  Segmentation results with a shape factor of 0.4
Fig.9  ROC-LV graph
Fig.10  The segmentation scale was 100, the shape factor was 0.4, and the compactness factor was 0.5
Fig.11  The result graph of object-oriented classification and pixel - based classification
Fig.12  Graph of iron tailings information extraction by object-oriented method and pixel - based method
研究区 分类方法 尾矿/
像元
验证样
本总和/
像元
尾矿
提取
精度/%
总体
精度/%
Kappa
系数
区域1 基于像元分类 238 258 92.25 84.99 0.754 7
面向对象分类 253 98.06 94.69 0.911 4
区域2 基于像元分类 318 344 92.44 91.36 0.859 1
面向对象分类 328 95.35 95.16 0.920 1
区域3 基于像元分类 106 138 76.81 85.79 0.814 6
面向对象分类 133 96.38 92.23 0.897 5
Tab.2  Object-oriented classification and pixel-based classification accuracy evaluation
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