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Author: Admin | 2025-04-28
Mongolia mining area is relatively large, and the main factors affecting actual deformation are the mining depth and thickness of the coal seam. The average buried depth of the coal seam in the Wu’an mining area is 550 m, and the average thickness is 5 m. The average buried depth of the coal seam in the Inner Mongolia mining area is 200 m, and the average thickness is 3.3 m. The mining depth is the main reason for the large deformation gradient in the Inner Mongolia mining area. The shallower the mining depth, the greater the actual deformation caused, and vice versa. Despite this, the accuracy of the monitoring results for the Inner Mongolia mining area using the fused DEM as an external DEM showed improvement. Therefore, DS-InSAR technology using fused DEM as an external DEM can monitor mining areas with different mining depths and reduce monitoring errors. 5.1.2. Accuracy Comparison between Different Ground Object PointsTo verify that non-DS points corresponding to land cover types (shrubs in this paper) could affect monitoring accuracy, we compared the monitoring accuracy of different land cover type points using field observation station data from each mining area. We visually interpreted the high-resolution UAV DOM of the two mining areas and extracted three types of ground features from the Wu’an mining area. We used the points in Figure 10b, namely shrubs, grassland, farmland with dirt roads, and ground features, including seven points for shrubs, five points for grassland, and four points for farmland with dirt roads. We also used the K8 and K14 points in Figure 10d and extracted two ground features, namely shrubs and thin grassland (Figure 11).Combined with points from the Wu’an mining area (Figure 11a), the two error types from 4 November 2018 to 4 March 2019 were counted, as shown in Table 4. The two error types in the table follow the same rule and are arranged in descending order: shrub, grassland, and farmland with dirt roads. The target point in the shrub had the lowest monitoring accuracy and the largest error. For the two points in the Inner Mongolia mining
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