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Proceedings Paper

Development of coastal upwelling edge detection algorithms associated with harmful algal blooms off the Washington coast using sea surface temperature imagery
Author(s): Nathan R. Evans; Dana L. Woodruff; Vera L. Trainer
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Paper Abstract

Satellite remote sensing imagery is being used to identify and characterize upwelling conditions on the coast of Washington State, with an emphasis on detecting ocean features associated with harmful algal bloom events. Blooms of phytoplankton, including the domoic acid-producing diatom Pseudo-nitzschia, appear to be associated with a semi-permanent eddy bordering Washington and British Columbia that is observed in satellite imagery during extended upwelling events. Strong upwelling conditions may act as a barrier to movement of these blooms onshore. Using NOAA AVHRR temperature imagery, edge detection algorithms are being developed to define the strength, location and extent of the surface temperature expression of upwelling along the coast of Washington. The edge detection technique uses a simple kernel-based gradient method that compares temperatures of pixels at a user-specified distance. This allows identification of larger features with subtle edges. The resulting maximum-gradient map is then converted to a binary format with a user-specified temperature threshold. Skeletonization and edge-linking algorithms are then employed to develop final map products. The upwelling edge detection maps are being examined in relation to harmful algal bloom events that have occurred along the coast.

Paper Details

Date Published: 22 August 2005
PDF: 6 pages
Proc. SPIE 5885, Remote Sensing of the Coastal Oceanic Environment, 58850L (22 August 2005); doi: 10.1117/12.617964
Show Author Affiliations
Nathan R. Evans, Battelle Marine Sciences Lab. (United States)
Dana L. Woodruff, Battelle Marine Sciences Lab. (United States)
Vera L. Trainer, NOAA Northwest Fisheries Science Ctr. (United States)

Published in SPIE Proceedings Vol. 5885:
Remote Sensing of the Coastal Oceanic Environment
Robert J. Frouin; Marcel Babin; Shubha Sathyendranath, Editor(s)

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