Fig. 1. Flow chart of overall technical route

Fig. 2. Structural diagram of pyramid model for multi-scale images

Fig. 3. Multiple types of images with different resolutions. (a) Image by oblique photogrammetric data; (b) image by satellite data; (c) image by oblique photogrammetry and satellite fusion

Fig. 4. Topographic map of research area in Hunan province

Fig. 5. Fused images. (a) Orthographic view; (b) side view

Fig. 6. Effect maps of real 3D image. (a) Effect map 1; (b) effect map 2; (c) effect map 3; (d) effect map 4

Fig. 7. Error statistics of real 3D model. (a) Error in X direction; (b) error in Y direction; (c) plane error; (d) elevation error