Identification of red tides using SPOT 4 data

Identification of red tides using SPOT 4 data

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Abstract
Laili Nordin
Malaysian Centre for Remote Sensing, Kuala Lumpur, Malaysia
Email: [email protected]

Ann Anton
Universiti Malaysia Sabah
Sabah, Malaysia
Email: [email protected]

Abstract
“Red Tides”, or highly toxic blooms of algae, causes mass mortality of marine lives and can lead to human intoxication or even death. In February 2000, red tide events were reported in Sabah, Malaysia. The occurrence of such events were due to an increase in nutrient (mainly NO3-N and PO4-P) concentrations in the coastal waters of Brunei Bay, from landuse activities in the Sipitang area. The red tide event was detected from SPOT 4 satellite, where bands XS1 and XS2 were used as inputs in the Red Tide image-processing algorithm. The results showed the presence of algae blooms occurring sporadically in about 5 percent of the total 20 km2 area covered by the satellite imagery.