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Spatial Accuracy in Orthophoto produced using UAV Photographic Images: Lägesnoggrannhet i ortofoton framställda med UAV-foton
Karlstad University, Faculty of Social and Life Sciences. x.
2016 (English)Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
Abstract [en]

The popularity of using UAV in image-taking for the production of 3D models and orthophotos has increased over time. Karlskoga Municipality has recently acquired an UAV to produce their own 3D models and orthophotos. This project paper aims to study the geospatial accuracy of the orthophotos and DEM files produced using the images taken with their UAV. The flight takes only a few minutes but a considerable time is spent in the production processes. Difficulty is experienced in determining the right center point for most GCPs. Produced orthophotos in the software Photoscan have a resolution from 1.7 to 2.4 centimeters while DEM files have a resolution from 3.4 to 4.8 centimeters. Four orthophotos and four DEM files are produced where GCPs are used and not used and at two different flight heights, 76 and 105 meters. The spatial data of the ten GCPs are identified on the orthophotos and DEM files in ArcMap and compared with GNSS NRTK measurements and Lantmäteriet's data. A visual control in terms of completeness of data, alignment, residual tilt and scale is also done. Standard deviations in plane for orthophotos there GCPs are not used are greater than 2 meters, while there GCPs are used are around 0.7 meters. Standard deviations for DEM files are observed at 0.8 meters.

Place, publisher, year, edition, pages
2016. , 47 p.
Keyword [en]
orthophoto, DEM, UAV, UAS, Photoscan, spatial accuracy, GCP, GSD
National Category
Other Civil Engineering Other Earth and Related Environmental Sciences
URN: urn:nbn:se:kau:diva-46245OAI: diva2:972787
External cooperation
Karlskoga Kommun
Subject / course
Physical Geography
Educational program
Programme in Surveying and Cartography (120 ECTS credits)
2016-08-23, KAU, 14:00 (English)
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2016-09-22Bibliographically approved

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