Abstract
Abstract. We conducted an experiment to investigate the feasibility of the deformation measurement of a large-scale solar power plant on reclaimed land by UAV photogrammetry. Two teams engaged in the experiment at first. One, which is called Team-A, carried out orientation of images following the procedure of conventional aerial photogrammetry. The other, which is called Team-C, executed that in the manner of close range photogrammetry. The RMSE in height measurement by Team-A was 121.5 mm, while that by Team-C was 8.7 mm. This paper reports an analysis conducted in order to investigate the cause of the large difference in height measurement accuracy between Team-A and Team-C. In the analysis the third team, which is called Team-S, conducts supplementary orientation by using the images utilized by Team-A in the same manner as Team-C did. The RMSE in height measurement by Team-S is 19.1 mm. Our investigation focuses on the difference of the arrangement of points utilized in the orientation. Team-A selected pass points and tie points on image automatically by Intergraph’s ImageStation Automatic Triangulation (ISAT) software, while Team-C and Team-S selected points to be utilized in orientation manually so that selected points are distributed uniformly in the experiment area. From the results of the analysis we conclude that the sets of tie points along a straight line on a plane that were selected automatically by the ISAT would bring the low accuracy in height measurement by Team-A.
Highlights
Various unmanned aerial vehicles (UAVs) have been utilized for photogrammetry (Eisenbeiss, 2011)
The periodic deformation measurement of solar panels on reclaimed land requires that a root mean squares of errors (RMSE) in height measurement should be less than several centimeters
From the results of the analysis we confirmed the conclusion of our previous paper (Matsuoka et al, 2012) that the deformation measurement of a large-scale solar power plant on reclaimed land by UAV photogrammetry would be feasible if points utilized in orientation of images have a sufficient number of bundles in good geometry
Summary
Various unmanned aerial vehicles (UAVs) have been utilized for photogrammetry (Eisenbeiss, 2011). The photogrammetric potential of an UAV has been recently evaluated in several studies (Gülch, 2011, Haala et al, 2011, Küng et al, 2011, Vallet et al, 2011, Rosnell and Honkavaara, 2012) These studies encouraged us to measure deformation of solar panels on land reclaimed from the sea with sufficient accuracy by UAV photogrammetry. We conducted an experiment to investigate the feasibility of the deformation measurement of solar panels on reclaimed land by UAV photogrammetry. One carried out orientation of images following the procedure of conventional aerial photogrammetry, and the other executed that in the manner of close range photogrammetry We name the former Team-A, while we name the latter Team-C. The analysis focused on the comparison between Team-A and Team-S
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