TY  - JOUR
TI  - Assessing the spatial accuracy of UAV-derived products based on variation of flight altitudes
AB  - Unmanned Aerial Vehicles (UAVs), which can carry a variety of payloads, and be operated 
automatically or manually with ground control stations. Nowadays, UAVs can make 
photogrammetric flight plans and obtain photogrammetric data with existing sensor systems. 
Automatic data acquisition processes provide lower cost, and high spatial and temporal 
resolution images in a short period of time compared to other measurement methods. As a 
result, orthomosaics, dense point clouds and digital surface models (DSMs) are produced and 
these UAV-derived data are used in various disciplines such as constructions, geomatics, earth 
sciences, etc. In this study, the same flight plans were realized with an UAV at different 
altitudes and all aerial images were obtained with the same integrated digital camera. As a 
result of the processing of images acquired from different altitudes, orthomosaics, DSMs and 
point cloud were produced. In this study, it is aimed to compare the length, areal and 
volumetric differences of a small geostationary object. Ground control points (GCPs), which 
were collected by RTK-GPS (Real-Time Kinematic) in conjunction with the flight integrated 
into data production process in order to highly accurate product. Ultimately, cross-correlation 
has been done with the produced data and the terrestrial measurement. Results show that the 
dimension of the object depend on the flight altitude as expected, however the volumetric 
changes vary due to the uncertainties in the raw point cloud data.
AU  - Ozcan, Orkan
AU  - Bayram, Bülent
AU  - Akay, Semih Sami
AU  - Gorum, Tolga
AU  - Balik Sanli, Fusun
DO  - 10.31127/tuje.653631
PY  - 2021
JO  - Turkish Journal of Engineering
VL  - 5
IS  - 1
SN  - 2587-1366
SP  - 35
EP  - 40
DB  - TRDizin
UR  - http://search/yayin/detay/526370
ER  -