One way is to combine aerial photos with ground photos. Photos from “Region A” (shown in Figure 69) were combined with 80 aerial photos from the UAV dataset. CMPMVS was used for the implementation. The result shows that combining ground photos with aerial photos will not increase detailed information dramatically. Figure 81 gives a comparison between a model from ground photos and a model which is generated from a combination of ground photos and aerial photos. The result is very clear: in CMPMVS workflow, by using a combination of ground photos and aerial photos will not increase the level of detail on specific regions. The reason was described in section 4.1. CMPMVS surface reconstruction process is similar to the process in PhotoScan, the program needs a local coordinate system as a platform, and on this platform meshes will be created. For large study area, even detailed photos are provided for reconstructing small regions. The whole model will still be built on a large scale. Surface reconstruction process will not distinguish sub regions. When two datasets were combined as one, the generated models have a level of detail from the photos which have larger scale. As shown in Figure 82: some textures in the model are from ground photos, but the Target area “Region A” was smoothed to the same level of detail with the other areas. Therefore for detailed area reconstruction, the only way is to use photos from small regions, and georeferencing then separately. Finally models describing small regions can be glued together.