Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas

Figure 4

Aerial survey achievements of unmanned aerial vehicles. (a) Top view of the working area of the bucket-wheel excavator. (b) Top view of the eastern area of the working slope. (c) Three-dimensional model of the surface local area in the middle part of the working slope. (d) Three-dimensional surface model of the eastern area of the working slope.

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