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Aerial photosieving of exposed gravel bars for the rapid calibration of airborne grain size maps

Dugdale, Stephen J.; Carbonneau, Patrice E.; Campbell, David


Patrice E. Carbonneau

David Campbell


In recent years, fluvial remote sensing has seen considerable progress in terms of methods capable of system scale characterisation of river catchments. One key development is automated grain size mapping. It has been shown that high resolution aerial photography can be used to automatically produce grain size maps over entire rivers. However, current aerial grain size mapping procedures all require field calibration data. The collection of such data can be costly and problematic in the case of remote areas. This paper presents a method developed to remove the need for field based calibration data. Called ‘aerial photosieving’, this method consists of using the same very high resolution aerial imagery intended for grain size map production to visually measure particle sizes on‐screen in order to provide calibration data. The paper presents a rigorous comparison of field‐based photosieving calibration data and aerial photosieving calibration data. Statistical tests are used to demonstrate that aerial photosieving gives similar results when compared with field‐based data with only a slight systematic overprediction. The new aerial photosieving method therefore simplifies the overall procedure required for the production of grain size maps and thus improves the cost‐effectiveness and potential availability of this new fluvial remote sensing technology.


Dugdale, S. J., Carbonneau, P. E., & Campbell, D. (2010). Aerial photosieving of exposed gravel bars for the rapid calibration of airborne grain size maps. Earth Surface Processes and Landforms, 35(6), 627-639. doi:10.1002/esp.1936

Journal Article Type Article
Acceptance Date Sep 14, 2009
Online Publication Date Jan 19, 2010
Publication Date May 5, 2010
Deposit Date Nov 23, 2018
Journal Earth Surface Processes and Landforms
Print ISSN 0197-9337
Electronic ISSN 1096-9837
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 35
Issue 6
Pages 627-639
Keywords Earth-Surface Processes; Earth and Planetary Sciences (miscellaneous); Geography, Planning and Development
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