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They compared the satellite's answers against real measurements taken in the water itself.\n\nWhat they found: The results split cleanly. For muddiness, the free open-source method worked very well — as good as, and slightly better than, the paid commercial software the original study used. For algae, the same method did not work: in this murky estuary water it could not reliably tell how much chlorophyll-a was present.\n\nWhy it matters: It means a fully free and open toolchain is a credible, citable option for monitoring estuary muddiness — useful for the water authorities who report on rivers and coasts. But satellite algae readings in murky water should be treated as provisional. The wider lesson: 'satellite water quality' is not one reliable number. 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