Mapping Discharge from a Sewage Treatment Plant Using Rhodamine Dye

This map of the discharge of a sewage treatment plant into a river was made using multispectral remote sensing from a small aircraft. Spectral bands were designed to match the absorption and fluorescence of Rhodamine dye, and the image calibrated using in situ fluorescence measurements. The image data was acquired at low altitude under heavy cloud and during rain, but the effect of variable illumination was removed using an up-looking light sensor. The calibration versus in situ measurements of dye concentration was linear over the range of measurements, with a high correlation.

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Last update 19 March 2007
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