@prefix this: <https://w3id.org/sciencelive/np/RAyA6pt4EhMD7hZBXAwLJtBjsLYaYZQsoafauxS5BXjWw> .
@prefix sub: <https://w3id.org/sciencelive/np/RAyA6pt4EhMD7hZBXAwLJtBjsLYaYZQsoafauxS5BXjWw/> .
@prefix np: <http://www.nanopub.org/nschema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix npx: <http://purl.org/nanopub/x/> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

sub:Head {
  this: a np:Nanopublication;
    np:hasAssertion sub:assertion;
    np:hasProvenance sub:provenance;
    np:hasPublicationInfo sub:pubinfo .
}

sub:assertion {
  sub:po-delta-sourceextractor-study a <https://w3id.org/sciencelive/o/terms/FORRT-Replication-Study>,
      <https://w3id.org/sciencelive/o/terms/Replication-Study>;
    <http://www.w3.org/2000/01/rdf-schema#label> "Astronomy Source Extractor applied to satellite night lights over the Po Delta";
    <http://www.w3.org/2004/02/skos/core#related> <http://www.wikidata.org/entity/Q180644>,
      <http://www.wikidata.org/entity/Q473972>;
    <https://w3id.org/sciencelive/o/terms/hasDeviationDescription> "The Source Extractor tool is normally applied to astronomical sky images (FITS); here the input is a terrestrial satellite night-lights raster (GeoTIFF). Detection parameters are left at the tool defaults; no other changes were made to the tool or workflow.";
    <https://w3id.org/sciencelive/o/terms/hasDiscipline> <http://www.wikidata.org/entity/Q199687>;
    <https://w3id.org/sciencelive/o/terms/hasMethodologyDescription> "A NASA Black Marble (VNP46A4) annual VIIRS night-lights composite over the eastern Po Valley / Po Delta (tile h19v04) was retrieved via earthaccess, the radiance band extracted and written as a single-channel GeoTIFF (water/dark background, bright settlements). This was run through the Galaxy astronomy \"source-extractor\" tool (astroteam/source_extractor_astro_tool, built on SEP) on usegalaxy.eu via BioBlend, at tool defaults: detection threshold 1.5x the global background RMS, minimum area 5 pixels, deblending (nthresh 32, cont 0.005), background mesh 64x64. The tool returns a source catalog (position, flux, shape), a segmentation map and a sources overlay. The catalog and the radiance field were overlaid on the EU Natura 2000 polygons (EEA): the light-extent metric is the fraction of Po Delta pixels with radiance above 1 nW/cm^2/sr, and nearby settlements are catalog sources within ~10 km of the protected area. A local SEP path reproduces the catalog for credential-free runs.";
    <https://w3id.org/sciencelive/o/terms/hasScopeDescription> "Whether the astronomy source-extraction workflow, applied to satellite night-lights imagery of the Po Delta region, detects lit settlements as discrete sources and yields a measure of the extent of artificial light within the Po Delta Natura 2000 protected area. In scope: settlement detection and a light-extent metric for the Po Delta from a single annual VIIRS composite, plus the proximity of detected settlements to the protected area. Out of scope: temporal trends, species-level biodiversity impacts, comparison against a dedicated Earth-observation settlement product, and sub-pixel or low-radiance light.";
    <https://w3id.org/sciencelive/o/terms/targetsClaim> <https://w3id.org/sciencelive/np/RA2fQHXqmUHhYm46lrCjeXBQbX-h5uFBWo479kkgG5yO8/po-delta-light-intrusion> .
}

sub:provenance {
  sub:assertion prov:wasAttributedTo <https://orcid.org/0000-0002-1784-2920> .
}

sub:pubinfo {
  <https://orcid.org/0000-0002-1784-2920> <http://xmlns.com/foaf/0.1/name> "Anne Fouilloux" .
  
  this: dc:created "2026-06-21T14:12:06.730Z"^^xsd:dateTime;
    dc:creator <https://orcid.org/0000-0002-1784-2920>;
    dc:license <https://creativecommons.org/licenses/by/4.0/>;
    npx:introduces sub:po-delta-sourceextractor-study;
    npx:wasCreatedAt <https://platform.sciencelive4all.org>;
    <http://www.w3.org/2000/01/rdf-schema#label> "Astronomy Source Extractor applied to satellite night lights over the Po Delta";
    <https://w3id.org/np/o/ntemplate/wasCreatedFromTemplate> <https://w3id.org/np/RAuLEjPp-4dTvPwMkfHggTto1CgjIftiGRAgHlyeEonjQ> .
  
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    npx:hasSignatureTarget this:;
    npx:signedBy <https://orcid.org/0000-0002-1784-2920> .
}