Hermas, ElSayed and Leprince, Sebastien and Abou El-Magd, Islam (2012) Retrieving sand dune movements using sub-pixel correlation of multi-temporal optical remote sensing imagery, northwest Sinai Peninsula, Egypt. Remote Sensing of Environment, 121 . pp. 51-60. ISSN 0034-4257 http://resolver.caltech.edu/CaltechAUTHORS:20120710-133552775
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Sand dune movements pose potential hazards against various land use activities in Egypt. To avoid or to minimize the hazards associated with sand dunes, it is critical to determine their rates and patterns of migration at high accuracy and over wide spatial coverage. This is, however, a real challenge using field work and traditional remote sensing approaches. The co-registration of optically sensed images and correlation (COSI-Corr) complements traditional approaches to provide accurate measurements at wide spatial coverage. Applying the COSI-Corr technique to two SPOT 4 panchromatic images acquired above North Sinai, we measured lateral migration of 6.0 to 19.4 m/yr with an average of 7.7 m/yr, and 9.3 to 15.0 m/yr with an average of 11.9 m/yr for the whole barchans dune areas and a selected sample of barchan dunes, respectively. We also detected that the lateral movements along the crest lines of linear dunes ranged from 4.0 to 20.1 m/yr with an average of 6.8 m/yr for the whole area occupied by linear dunes. For a selected linear dune within the study area, the lateral migration of peaks and saddles along the crest lines ranged from 5.5 to 16.7 m/yr with an average of 12.4 m/yr. The lateral migration of both barchans dunes and linear dunes showed high spatial variability. Validation of these results against the previously measured migration rates indicated high degree of accuracy of the technique. In addition, the displacement field produced from the correlation indicated that the direction of sand dune movements occurred towards the east and southeast, which is well aligned with the previously determined sand dune drifting potentials.
|Additional Information:||© 2012 Elsevier Inc. Received 24 August 2011. Revised 17 December 2011. Accepted 7 January 2012. Available online 17 February 2012. The authors would like to thank the National Authority for Remote Sensing and Space Sciences (NARSS) for supporting this research activity through providing satellite imagery and funding the field work. S. Leprince was partly supported by the Keck Institute for Space Studies and by the Gordon and Betty Moore Foundation.|
|Subject Keywords:||Sand dune movement; Sinai Peninsula; Optical remote sensing; COSI-Corr|
|Official Citation:||ElSayed Hermas, Sebastien Leprince, Islam Abou El-Magd, Retrieving sand dune movements using sub-pixel correlation of multi-temporal optical remote sensing imagery, northwest Sinai Peninsula, Egypt, Remote Sensing of Environment, Volume 121, June 2012, Pages 51-60, ISSN 0034-4257, 10.1016/j.rse.2012.01.002.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||10 Jul 2012 23:17|
|Last Modified:||10 Jul 2012 23:17|
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