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Article

How Image Acquisition Geometry of UAV Campaigns Affects the Derived Products and Their Accuracy in Areas with Complex Geomorphology

Department of Geology, University of Patras, 265 04 Patras, Greece
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Author to whom correspondence should be addressed.
Academic Editor: Wolfgang Kainz
ISPRS Int. J. Geo-Inf. 2021, 10(6), 408; https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10060408
Received: 30 March 2021 / Revised: 8 June 2021 / Accepted: 11 June 2021 / Published: 13 June 2021
(This article belongs to the Special Issue GIS and Remote Sensing Applications in Geomorphology)
The detailed and accurate mapping of landscapes and their geomorphological characteristics is a key issue in hazard management. The current study examines whether the image acquisition geometry of unmanned aerial vehicle (UAV) campaigns affects the accuracy of the derived products, i.e., orthophotos, digital surface models (DSMs) and photogrammetric point clouds, while performing a detailed geomorphological mapping of a landslide area. UAV flights were executed and the collected imagery was organized into three subcategories based on the viewing angle of the UAV camera. The first subcategory consists of the nadir imagery, the second is composed of the oblique imagery and the third category blends both nadir and oblique imagery. UAV imagery processing was carried out using structure-from-motion photogrammetry (SfM). High-resolution products were generated, consisting of orthophotos, DSMs and photogrammetric-based point clouds. Their accuracy was evaluated utilizing statistical approaches such as the estimation of the root mean square error (RMSE), calculation of the geometric mean of a feature, length measurement, calculation of cloud-to-cloud distances as well as qualitive criteria. All the quantitative and qualitative results were taken into account for the impact assessment. It was demonstrated that the oblique-viewing geometry as well as the combination of nadir and oblique imagery could be used effectively for geomorphological mapping in areas with complex topography and steep slopes that overpass 60 degrees. Moreover, the accuracy assessment revealed that those acquisition geometries contribute to the creation of significantly better products compared to the corresponding one arising from nadir-viewing imagery. View Full-Text
Keywords: UAV; photogrammetry; oblique; nadir; geomorphological mapping UAV; photogrammetry; oblique; nadir; geomorphological mapping
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MDPI and ACS Style

Kyriou, A.; Nikolakopoulos, K.; Koukouvelas, I. How Image Acquisition Geometry of UAV Campaigns Affects the Derived Products and Their Accuracy in Areas with Complex Geomorphology. ISPRS Int. J. Geo-Inf. 2021, 10, 408. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10060408

AMA Style

Kyriou A, Nikolakopoulos K, Koukouvelas I. How Image Acquisition Geometry of UAV Campaigns Affects the Derived Products and Their Accuracy in Areas with Complex Geomorphology. ISPRS International Journal of Geo-Information. 2021; 10(6):408. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10060408

Chicago/Turabian Style

Kyriou, Aggeliki, Konstantinos Nikolakopoulos, and Ioannis Koukouvelas. 2021. "How Image Acquisition Geometry of UAV Campaigns Affects the Derived Products and Their Accuracy in Areas with Complex Geomorphology" ISPRS International Journal of Geo-Information 10, no. 6: 408. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10060408

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