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The purpose of this study is the photogrammetric survey of a forested area using Unmanned Aerial Vehicles (UAV), and the estimation of the Digital Terrain Model (DTM) of the area, based on the photogrammetrically produced Digital Surface Model (DSM). Furthermore, through the classification of the height difference between a DSM and a DTM, a vegetation height model is estimated, and a vegetation type map is produced. Finally, the generated DTM was used in a hydrological analysis study in order to determine its suitability compared to the usage of the DSM. The selected study area was the forest of Seih-Sou (Thessaloniki). The DTM extraction methodology applies classification and filtering of point clouds, and aims in the production of a surface model including only terrain points (DTM). The method yielded a DTM which functioned satisfactorily as a basis for the hydrological analysis. Also, by classifying the DSM DTM difference, a vegetation heights model was generated. For the photogrammetric survey, 495 ae...

journal of unmanned vehicle systems

Photogrammetric surveying forests and woodlands with UAVs: techniques for automatic removal of vegetation and digital terrain model production for hydrological applications