Semi-Automatic Extraction of Triangular Facet Attitude Based on Edge Extraction Algorithm
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摘要: 岩层三角面的准确识别和快速检测是利用遥感技术获取地表地层产状信息的有效途径.提出了利用高分辨率卫星遥感立体像对，通过自动迭代调整高斯分布模型方差的Canny边缘检测算法实现岩层三角面半自动检测和地层产状快速提取方法.以南天山吐格尔明背斜为实验区，使用Worldview-2立体像对构建数字高程模型和0.5 m分辨率的数字正射影像，利用岩层三角面检测算法提取实验区的岩层三角面和产状.结果表明，提出的方法客观高效，提取准确率达到90.2%，能够准确反映构造趋势的变化，为复杂构造带的地表建模和构造分析提供依据.Abstract: Accurate identification and rapid detection of triangular facet is an effective way to use remote sensing technology to obtain stratum attitude information. In this paper, it proposes a method for semi-automatic detection of triangular facet and rapid extraction of bedding attitude. Using high-resolution satellite remote sensing stero image pairs, the method is based on Canny edge detection algorithm with an automatic iterative adjustment of Gaussian distribution model variance. Taking Tugerming anticline in the South Tianshan Mountains as the experimental area, a digital elevation model and digital orthophoto maps with the resolution of 0.5 m were constructed using Worldview-2 stereo pairs, and 81 triangular facets in the experimental area were extracted. The result shows that the method proposed in this paper is objective and efficient, and the extraction accuracy rate reaches 90.2%. The extracted attitude accurately reflect the changes in structure, providing a basis for surface modeling and structural analysis of complex structural belts.
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图 1 基于边缘检测算法和高分辨率立体像对的地层三角面产状提取方法总流程
Fig. 1. The flow chart of facet attitude extraction of stratigraphic triangle based on edge extraction algorithm and high-resolution remote sensing stereo pair
图 2 不同高斯分布模型方差σ对边缘检测的影响
红色线条表示边缘
Fig. 2. Influence of different Gaussian distribution model variances σ on edge detection
图 8 人工解译产状和拟合产状的极射赤平投影密度图
Fig. 8. Stereographic comparisons of pole-to-plane of manually extracted attitude and semi-automatic extraced attitude
图 9 人工解译产状-拟合产状对应图
倾向图虚线代表±20°误差，倾角图虚线代表±10°误差，符号代表该点提取线条的决定系数
Fig. 9. Manual interpreted attitude versus fitted plane attitude
图 10 近水平岩层面边缘点的高程及与拟合平面的高程差
Fig. 10. Elevation of the edge points of the rock triangular facet, and the elevation difference with the fitted plane
表 1 立体像对元数据信息表
Table 1. The metadata information of the stereo-imagery
文件名 行数 列数 成像时间 太阳高度角 太阳方位角 传感器高度角 传感器方位角 云量 东左像 18OCT01053450 24 568 15 948 2019-10-10T11:42:13 44.1° 167.1° 67.5° 355° 0 东右像 18OCT01053617 24 568 15 948 2019-10-10T11:40:24 44.2° 167.6° 63.6° 211.8° 0 西左像 18SEP18051308 28 360 25 836 2019-10-10T11:42:51 47.4° 156° 58.2° 71.4° 0 西右像 18SEP18051322 28 360 25 836 2019-10-10T11:40:57 47.5° 156.5° 55.2° 140.4° 0 
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