Roads and pipelines in desert areas can be buried by migrating sand dunes. The cost of removing this sand is directly proportional to the sand flux ofthe moving dunes. Traditionally, sand flux measurements have been carried out by costly geodetic field surveys and/or long term monitoring of stakes set out in the (inter)dunes. We have developed an alternative approach for measuring sand flux from pairs of high resolution optical satellite images with a change detection algorithm called COSI-Corr. Using pairs of optical satellite images, we detected dune migration over time intervals of months to years. We then used the resulting displacement map to automatically distinguish dunes from interdunes. We interpolated a surface between the interdune areas and subtracted it from a digital elevation model, thus obtaining dune heights and volumes. Multiplying height with celerity yielded a pixel-by-pixel estimate ofthe sand flux, which was used to assess the annual volume of sand that needs to be removed from artifacts such as roads in dune areas.


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error