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A collaboration of the University of Minnesota's Remote Sensing and Geospatial Analysis Laboratory and Water Resources Center

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State Level

Using Landsat satellite imagery, we recently used procedures explained in the Metro Level section to assess the water clarity of all lakes 20 acres or larger for the entire state of Minnesota.

For this state scale study, we used 19 Landsat satellite images acquired between 1990 and 1992, along with Secchi disk measurements collected on the ground.  After the model was applied, the resulting R2 value was 0.89. Click on Landsat vs. Secchi Disk Measurements in the right column to view this relationship.

Click on Lake Water Clarity for the Early 1990s to view lake water clarity for the entire state of Minnesota. The results show excellent potential for using Landsat data to monitor lake water quality at scales that are not feasible by conventional measurement methods.

At this state scale, what can influence lake water clarity?

  • Ecoregion (soils, geology, climate)

  • Land use

  • Lake morphology

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