Table of Contents
Remote Sens., Volume 8, Issue 9 (September 2016)
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Cover Story (view full-size image) The use of unmanned aerial vehicles (UAVs) combined with Structure-from-Motion (SfM) now allows [...] Read more. The use of unmanned aerial vehicles (UAVs) combined with Structure-from-Motion (SfM) now allows scientists to undertake low-level aerial surveys with relative ease. A wide range of disciplines now use the combined technique: ranging from undertaking ecological surveys to assessing surface change in a geomorphological context. Our work contributes to this exciting UAV-SfM research area by helping users understand how survey error can arise and how it can be avoided. When the camera positions used are unknown, the SfM processing requires known surveyed positions (xyz co-ordinates) on the ground (‘ground control points’, GCPs). We provide guidance on the impact of GCP number and distribution on survey error. View this paper