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Satellite imagery enables the measurement of Water Quality over a much wider area than hand
sampling using Secchi disks. These images show Landsat image data and derived water quality measurements for
Lake Minnetonka, Minnesota. The true-color image is similar to what is seen by the human eye, the
false-color image incorporates data in near-infrared wavelengths, and the water quality image shows
calculated Secchi disk transparency. Dark blue indicates high water quality, light green moderate water
quality, and dark green poor water quality. (Images courtesy Upper Great Lakes Regional Earth Science
Applications Center) Light from the Waves |
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