https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/Head https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo http://www.nanopub.org/nschema#hasAssertion https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/assertion https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo http://www.nanopub.org/nschema#hasProvenance https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/provenance https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo http://www.nanopub.org/nschema#hasPublicationInfo https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/pubinfo https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.nanopub.org/nschema#Nanopublication https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/assertion https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/summary http://purl.org/dc/terms/creator https://w3id.org/np/RAIA9ECaN2ypOVvl4YeNjT6nbpwko9xMcctxB_uYscLG4/claude-ai-agent https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/summary http://www.w3.org/1999/02/22-rdf-syntax-ns#type https://schema.org/CreativeWork https://w3id.org/np/RASxFnCL3-T2fumoIusXSW96-KRYtzTinMpRUyUCWGlJo/summary http://www.w3.org/2000/01/rdf-schema#comment Can free satellite data tell us how clean an estuary is? Researchers re-checked whether Europe's free Sentinel-2 satellites can measure water quality in a muddy estuary — using only open-source, freely available software instead of expensive commercial tools. What they measured: Two different things about the water, both from space: how muddy it is (called turbidity) and how much algae is in it (measured as chlorophyll-a). They compared the satellite's answers against real measurements taken in the water itself. What 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. Why 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. It depends on exactly what you are measuring, so each measurement has to be trusted, or doubted, on its own. 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