Fig. 1. Flow chart of mixed feature extraction and matching algorithm

Fig. 2. ASIFT feature extraction of aerial image. (a) Original image; (b) ASIFT features

Fig. 3. MSER feature extraction of aerial image. (a) Original image; (b) MSER features; (c) improved MSER features

Fig. 4. Contrast of extreme value regions before and after simulated street view image screening. (a) Original image; (b) MSER features; (c) improved MSER features

Fig. 5. Contrast of extreme value regions before and after aerial image screening. (a) Original image; (b) MSER features; (c) improved MSER features

Fig. 6. Feature extraction and matching result of multi-feature fusion

Fig. 7. Aerial images and simulated street images of Northeastern University

Fig. 8. Contrast of correct matching numbers of large affine image with different algorithms

Fig. 9. Contrast of correct matching rates of large affine image with different algorithms

Fig. 10. Dense point cloud model of Northeastern University library joint space-ground modeling