DBPapers
DOI: 10.5593/SGEM2016/B22/S10.115

IMPACT OF THE USE OF GROUND CONTROL POINTS ON THE ACCURACY OF ORTHOMOSAIC IN EXAMPLE OF UAV PLATFORM "MUST Q"

N. Liba, J. Berg-Jurgens, I. Jarve
Thursday 8 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-59-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book2 Vol. 2, 901-908 pp

ABSTRACT
Development of photogrammetry has reached to a new level due to use of unmanned
aerial vehicles (UAV). The popularity of the use of UAV’s for aerial photogrammetry
has grown rapidly and many companies are practicing with them due to low cost and
flexibility. [3]
The purpose of this research is to study the effect of different methods used in aerial
triangulation of UAV aerial imagery for geometric accuracy of orthomosaics.
Aerial imageries were taken in spring of 2014 in Tartu. For orthomosaicing three
projects were created – automatic, semimanual and manual. Differences of these
projects were in manual interferences of each processing. Automatic was processed
fully automatically without ground control point’s (GCP), semimanual did use GCP’s,
but all the processing was done automatically and the manual project included GCP’s
and manual processing. For geometric accuracy the GPS and from the orthomosaics
interactively measured check points were compared. Projects allowed accuracy limit
was three times of the pixel size 0,15 m.
The RMSE was in automatic project 0,664 m, in semimanual project 0,090 m and in
manual project 0,079 m. Results showed that semimanual and manual projects remained within the error limit allowed. Due the results it was concluded that the use of GCP provides the orthomosaic sufficient accuracy.

Keywords: Unmanned Aerial Vehicle, Aerial Triangulation, Accuracy of Orthomosaic