The predicted Secchi depths were used to evaluate the recreational suitability for swimming and recreation using an assessment framework developed from public perception of water clarity. We found that incorporating Landsat 8 spectral data into methodologies created to retrieve the inherent optical properties (IOP) of coastal waters was effective at predicting in situ measures of the clarity of inland water bodies. We have applied an approach which uses atmospherically corrected Landsat 8 data to estimate the water clarity in freshwater bodies by using the quasi-analytical algorithm (QAA) and Contrast Theory to predict Secchi depths for more than 270 lakes and reservoirs across the continental US. Water clarity is often assessed using a Secchi disk attached to a measured line and lowered to a depth where it can be no longer seen. The clarity of waters is generally valued for esthetic and recreational purposes. Water clarity has long been used as a visual indicator of the condition of water quality.
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