Special Section on Remote Sensing for Investigating the Coupled Biogeophysical and Biogeochemical Process of Harmful Algal Blooms

Slope algorithm to map algal blooms in inland waters for Landsat 8/Operational Land Imager images

[+] Author Affiliations
Igor Ogashawara, Lin Li

Indiana University–Purdue University Indianapolis, Department of Earth Sciences, 723 West Michigan Street, SL118, Indianapolis, Indiana 46202, United States

Max Jacobo Moreno-Madriñán

Indiana University–Purdue University Indianapolis, Fairbanks School of Public Health, Department of Environmental Health, 1050 Wishard Boulevard, Floors 5 and 6, Indianapolis, Indiana 46202, United States

J. Appl. Remote Sens. 11(1), 012005 (Dec 28, 2016). doi:10.1117/1.JRS.11.012005
History: Received July 31, 2016; Accepted December 5, 2016
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Abstract.  Monitoring algal blooms using traditional methods is expensive and labor intensive. The use of satellite technology can attenuate such limitations. A common problem associated with the application of such technology is the need to eliminate the effects of atmosphere, which can be, at least, a time-consuming task. Thus, a remote sensed algal bloom monitoring system needs a simple algorithm which is nonsensitive to atmospheric correction and that could be applied to small aquatic systems. A slope algorithm (SAredNIR) was developed to detect and map the extension of algal blooms using the Landsat 8/Operational Land Imager. SAredNIR was shown to have advantages over other commonly used indices to monitor algal blooms, such as normalized difference vegetation index (NDVI), normalized difference water index, and floating algae index. SAredNIR was shown to be less sensitive to different atmospheric corrections, less sensitive to thin clouds, and less susceptible to confusion when classifying water and moderate bloom conditions. Based on ground truth data from Eagle Creek Reservoir, Indiana, SAredNIR showed an accuracy of 88.46% while NDVI only showed a 46.15% accuracy. Finally, based on qualitative and quantitative results, SAredNIR can be used as a tool to improve the governance of small size water resources.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Igor Ogashawara ; Lin Li and Max Jacobo Moreno-Madriñán
"Slope algorithm to map algal blooms in inland waters for Landsat 8/Operational Land Imager images", J. Appl. Remote Sens. 11(1), 012005 (Dec 28, 2016). ; http://dx.doi.org/10.1117/1.JRS.11.012005


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