Fig. 1. Image of the study area

Fig. 2. UAV data acquisition system

Fig. 3. Two-stage classification process flow chart

Fig. 4. RepVGG structure diagram

Fig. 5. MyBlock structure diagram

Fig. 6. Improved the network structure diagram

Fig. 7. Unet and the method in this paper compared the training iteration graph

Fig. 8. Phase I object detection results （Part）

Fig. 9. Phase II classification results （Part）