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Article

Testing Accuracy and Repeatability of UAV Blocks Oriented with GNSS-Supported Aerial Triangulation

1
Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze, 181/A, 43124 Parma, Italy
2
Environmental Protection Agency of Valle d’Aosta, Climate Change Unit, Loc. Grande Charrière, 44, 11020 Saint-Christophe (AO), Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Farid Melgani, Francesco Nex, Norman Kerle and Prasad S. Thenkabail
Received: 15 December 2016 / Revised: 6 February 2017 / Accepted: 15 February 2017 / Published: 18 February 2017
(This article belongs to the Special Issue Recent Trends in UAV Remote Sensing)
UAV Photogrammetry today already enjoys a largely automated and efficient data processing pipeline. However, the goal of dispensing with Ground Control Points looks closer, as dual-frequency GNSS receivers are put on board. This paper reports on the accuracy in object space obtained by GNSS-supported orientation of four photogrammetric blocks, acquired by a senseFly eBee RTK and all flown according to the same flight plan at 80 m above ground over a test field. Differential corrections were sent to the eBee from a nearby ground station. Block orientation has been performed with three software packages: PhotoScan, Pix4D and MicMac. The influence on the checkpoint errors of the precision given to the projection centers has been studied: in most cases, values in Z are critical. Without GCP, the RTK solution consistently achieves a RMSE of about 2–3 cm on the horizontal coordinates of checkpoints. In elevation, the RMSE varies from flight to flight, from 2 to 10 cm. Using at least one GCP, with all packages and all test flights, the geocoding accuracy of GNSS-supported orientation is almost as good as that of a traditional GCP orientation in XY and only slightly worse in Z. View Full-Text
Keywords: UAV; GNSS; RTK; Integrated Sensor Orientation; accuracy; repeatability; ground control points; checkpoints UAV; GNSS; RTK; Integrated Sensor Orientation; accuracy; repeatability; ground control points; checkpoints
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MDPI and ACS Style

Benassi, F.; Dall’Asta, E.; Diotri, F.; Forlani, G.; Morra di Cella, U.; Roncella, R.; Santise, M. Testing Accuracy and Repeatability of UAV Blocks Oriented with GNSS-Supported Aerial Triangulation. Remote Sens. 2017, 9, 172. https://0-doi-org.brum.beds.ac.uk/10.3390/rs9020172

AMA Style

Benassi F, Dall’Asta E, Diotri F, Forlani G, Morra di Cella U, Roncella R, Santise M. Testing Accuracy and Repeatability of UAV Blocks Oriented with GNSS-Supported Aerial Triangulation. Remote Sensing. 2017; 9(2):172. https://0-doi-org.brum.beds.ac.uk/10.3390/rs9020172

Chicago/Turabian Style

Benassi, Francesco, Elisa Dall’Asta, Fabrizio Diotri, Gianfranco Forlani, Umberto Morra di Cella, Riccardo Roncella, and Marina Santise. 2017. "Testing Accuracy and Repeatability of UAV Blocks Oriented with GNSS-Supported Aerial Triangulation" Remote Sensing 9, no. 2: 172. https://0-doi-org.brum.beds.ac.uk/10.3390/rs9020172

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