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dc.contributor.author Brasington, James
dc.contributor.author Wheaton, Joe
dc.contributor.author Vericat, Damià
dc.contributor.author Cowie, Michaela
dc.date.accessioned 2011-07-18T09:25:44Z
dc.date.available 2011-07-18T09:25:44Z
dc.date.issued 2011-07-18
dc.identifier.citation Brasington , J , Wheaton , J , Vericat , D & Cowie , M 2011 , ' Accuracy assessment of aerial photographs acquired using light-than-air blimps: low cost tools for mapping river corridors ' River Research and Applications , vol 25 , no. 8 , pp. 985-1000 . , 10.1002/rra.1198 en
dc.identifier.issn 1535-1467
dc.identifier.other PURE: 169109
dc.identifier.other dspace: 2160/7153
dc.identifier.uri http://hdl.handle.net/2160/7153
dc.description Vericat, D., Brasington, J., Wheaton, J., Cowie, M. (2009). Accuracy assessment of aerial photographs acquired using light-than-air blimps: low cost tools for mapping river corridors. River Research and Applications, 25(8), 985-1000. en
dc.description.abstract Monitoring river systems with repeat aerial photography is a powerful tool although the temporal resolution of surveys is rarely performed at anything better than annual time-scales. In recent years, a variety of low-cost aerial platforms for acquiring aerial photography have emerged. While these economical options may facilitate more frequent repeat surveys, the accuracy of imagery needs further consideration. The accuracy of imagery obtained from a Lighter-Than-Air Blimp is investigated through two simple experiments. The first looks at the geospatial error of aerial photographs derived using five geometric transformation models, and the sensitivity of the photo registration quality to various ground control point (GCP) configurations and densities. At high GCP densities, higher order polynomial transformation models provide the highest quality registrations. However, at more modest GCP densities (i.e. 19-28 GCPs Ha(-1)), simple aerotriangulation and 2nd order polynomial transformation models perform modestly, resulting in registration errors at standards equal to or better than obtained with conventional aerial photography (e.g. 0.5-1 m). The quality of image registration is highly dependent oil the configuration of GCPs. In a second experiment, the practical utility of producing a mosaic of blimp acquired imagery is explored over a kilometre long braided reach. Even at relatively low GCPs densities (e.g. 9 GCPs Ha(-1)), a mosaiced aerial of the entire reach can be produced of adequate quality to support bar-scale mapping of patch-scale features. The survey required less than a single day of field work and laboratory processing, and presents a cost-effective alternative to traditionally commissioned flights. Copyright (C) 2008 John Wiley & Sons, Ltd. en
dc.format.extent 16 en
dc.language.iso eng
dc.relation.ispartof River Research and Applications en
dc.subject aerial photography en
dc.subject blimp en
dc.subject remote sensing en
dc.subject GCP en
dc.subject registration errors en
dc.subject river monitoring en
dc.subject repeat surveys en
dc.title Accuracy assessment of aerial photographs acquired using light-than-air blimps: low cost tools for mapping river corridors en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1002/rra.1198
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Catchment and Coastal Research en
dc.description.status Peer reviewed en


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