https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/Head https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw http://www.nanopub.org/nschema#hasAssertion https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/assertion https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw http://www.nanopub.org/nschema#hasProvenance https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/provenance https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw http://www.nanopub.org/nschema#hasPublicationInfo https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/pubinfo https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.nanopub.org/nschema#Nanopublication https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/assertion https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/po-delta-light-intrusion-outcome http://schema.org/endDate 2026-06-20 https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/po-delta-light-intrusion-outcome http://www.w3.org/1999/02/22-rdf-syntax-ns#type https://w3id.org/sciencelive/o/terms/FORRT-Replication-Outcome https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/po-delta-light-intrusion-outcome http://www.w3.org/2000/01/rdf-schema#label Source Extractor catalogs 453 settlements; ~18.5% of the Po Delta is lit https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/po-delta-light-intrusion-outcome https://w3id.org/sciencelive/o/terms/hasConclusionDescription An astronomy source-detection tool — Source Extractor (SExtractor / SEP) — run unchanged through Galaxy on VIIRS night lights, detects and catalogs lit settlements just as it catalogs stars, and turns that catalog into a biodiversity-impact measure. The Po Delta Natura 2000 protected area is darker than its surroundings (mean night radiance 0.96 vs 4.11 nW/cm^2/sr region-wide) and so remains a relative dark refuge, but artificial light already covers about 18.5 percent of its area and 145 detected settlements lie within roughly 10 km of it — a measurable encroachment of light pollution on a nocturnal-biodiversity wetland. This confirms the cross-discipline transfer: a FAIR, well-described Galaxy tool from astronomy does useful Earth-observation / biodiversity work without modification. https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/po-delta-light-intrusion-outcome https://w3id.org/sciencelive/o/terms/hasConfidenceLevel https://w3id.org/sciencelive/o/terms/Moderate https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/po-delta-light-intrusion-outcome https://w3id.org/sciencelive/o/terms/hasEvidenceDescription Po Delta / eastern Po Valley, NASA Black Marble VNP46A4 (VIIRS) 2021 annual composite (tile h19v04), run on usegalaxy.eu. Source Extractor cataloged 453 settlements region-wide (position, flux, size). Inside Natura 2000 sites the mean radiance is 1.34; inside the Po Delta it is 0.96, versus 4.11 region-wide. 18.5 percent of the Po Delta area exceeds 1 nW/cm^2/sr (lit); 145 cataloged settlements fall within ~10 km of the Po Delta. The Galaxy run and a local SEP reimplementation give the same catalog (453 settlements both ways). Provenance: results/galaxy_provenance.json (Galaxy history + parameters); figures/main_result.png. Github: https://github.com/annefou/fiesta-galaxy-sourceextractor-eo https://w3id.org/sciencelive/np/RA7zowzpxWmmoRaFkRtc6xLUf395EYHMi0QwYAuQKtBAw/po-delta-light-intrusion-outcome https://w3id.org/sciencelive/o/terms/hasLimitationsDescription This is a single annual snapshot, not a temporal trend, over one region. Night-lights radiance is a proxy for human presence and artificial-light exposure, not a direct biodiversity measurement, and "lit" uses a single 1 nW/cm^2/sr threshold. In the most intensely lit parts of the Po plain the background is no longer dark, so source detection there is less clean — the method works best at the refuge/city edge, like the Po Delta. 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