Abstract

The derivations of orthophoto and DSM from UAV photos have been widely used. It was indi-cated the advantages in accuracy, mobility, and economy compared to traditional approaches. In Vietnam, the applications of UAV photogrammetry are in initial stages, and their achievements are varied depends on the capacity and experience of implementation instituitions. This study aims to 1/propose a implementation workflow of UAV photogrammetry for orthophoto and DSM derivation; 2/ apply of proposed workflow for DSM and orthophoto generation; 3/ evaluate the potential appli-cation of UAV photogrammetry. The pilot application in Bavi, Hanoi showed: the efficient and fea-sibility of the UAV photo capturing processes; the significant contribution of the spatial distribution of ground control points compared to their quantity; the accuracy of derivated orthophoto and DSM were adapted to topographic maps at the scale of 1/500 if seven ground control points were uti-lized.