Mapping of shifting tidal estuaries to support inshore rescue

Ciara N. McGrath; Ruaridh A. Clark; Christos Ilioudis; Gwilym Gibbons; David McKee; Carmine Clemente; Malcolm Macdonald

doi:10.1117/12.2567414

20 September 2020 Mapping of shifting tidal estuaries to support inshore rescue

Ciara N. McGrath, Ruaridh A. Clark, Christos Ilioudis, Gwilym Gibbons, David McKee, Carmine Clemente, Malcolm Macdonald

Proceedings Volume 11529, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2020; 1152903 (2020) https://doi.org/10.1117/12.2567414
Event: SPIE Remote Sensing, 2020, Online Only

Abstract

Across the world, many coastal tidal regions are unsafe to navigate due to shifting mud and sand pushed by water currents. Ability to regularly map the current location of a channel will aid safe passage for commercial, leisure and rescue craft. This work investigates the use of synthetic aperture radar data derived from satellites to provide accurate mapping of moving channels in coastal regions. As images must be collected at low tide, data availability is assessed considering the relationship between the orbital motion of the satellites and the tides. Change detection methods are applied to suitable images to map changes in the location of navigable channels. Pixels that undergo similar changes over time (e.g. from water covered to exposed sand) are grouped together by examining the principal component of the covariance matrix, for a vector composed of pixel values from the same location at different times. The Solway Firth in Great Britain is selected as a trial site as it is exposed to some of Europe’s fastest tidal movements and ranges, and hence is one of Great Britain’s most treacherous stretches of coastline.

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Citation Download Citation

Ciara N. McGrath, Ruaridh A. Clark, Christos Ilioudis, Gwilym Gibbons, David McKee, Carmine Clemente, and Malcolm Macdonald "Mapping of shifting tidal estuaries to support inshore rescue", Proc. SPIE 11529, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2020, 1152903 (20 September 2020); https://doi.org/10.1117/12.2567414

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