•These images have very high resolution if flights are performed at 100-200 m height over the ground.
•Very high overlaps are recommended in order to reduce occluded areas and achieve more complete and detailed DSM
•A sufficient number of GCPs is mandatory in order to geo-reference the processed images within the bundle adjustment and derive point clouds: -The number of GCPs varies according to the image block dimensions and the complexity of the surveyed area
•The quality of achieved point clouds is usually very high (up to few centimeters) and this data can thus be used for further analysis and feature extraction.