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Catchment-scale mapping of surface grain size in gravel bed rivers using airborne digital imagery.

Carbonneau, P. E. and Lane, S. N. and Bergeron, N. E. (2004) 'Catchment-scale mapping of surface grain size in gravel bed rivers using airborne digital imagery.', Water resources research., 40 . W07202.

Abstract

This study develops and assesses two methods for estimating median surface grain sizes using digital image processing from centimeter-resolution airborne imagery. Digital images with ground resolutions of 3 cm and 10 cm were combined with field calibration measurements to establish predictive relationships for grain size as a function of both local image texture and local image semivariance. Independently acquired grain size data were then used to assess the algorithm performance. Results showed that for the 3 cm imagery both local image semivariance and texture are highly sensitive to median grain size, with semivariance being a better predictor than image texture. However, in the case of 10 cm imagery, sensitivity of image semivariance and texture to grain size was poor, and this scale of imagery was found to be unsuitable for grain size estimation. This study therefore demonstrates that local image properties in very high resolution digital imagery allow for automated grain size measurement using image processing and remote sensing methods

Item Type:Article
Keywords:Fluvial grain size measurement, Airborne remote sensing, Digital image processing, Image semivariance, Image texture.
Full text:PDF - Published Version (273Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1029/2003WR002759
Publisher statement:© 2004 American Geophysical Union. Additional information: Carbonneau, P. E., Lane, S. N., Bergeron, N. E, (2004), 'Catchment-scale mapping of surface grain size in gravel bed rivers using airborne digital imagery', Water resources research, 40, W07202, 10.1029/2003WR002759 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Record Created:06 Oct 2008
Last Modified:02 Aug 2011 16:25

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