@prefix this: <https://w3id.org/sciencelive/np/RALm0wEYfKg4NKqTwY33LsGKIR7UH0Ut2IgYvX8uEeJMM> .
@prefix sub: <https://w3id.org/sciencelive/np/RALm0wEYfKg4NKqTwY33LsGKIR7UH0Ut2IgYvX8uEeJMM/> .
@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:s2-equal-area-healpix-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> "Angular power spectrum of a Sentinel-2 scene on equal-area HEALPix";
    <http://www.w3.org/2004/02/skos/core#related> <http://www.wikidata.org/entity/Q1331626>,
      <http://www.wikidata.org/entity/Q199687>, <http://www.wikidata.org/entity/Q4302480>,
      <http://www.wikidata.org/entity/Q5629401>;
    <https://w3id.org/sciencelive/o/terms/hasDeviationDescription> "Question-rooted: there is no prior equal-area-HEALPix power-spectrum pipeline for Sentinel-2 to deviate from. This is a fresh application of the equal-area approach using the GRID4EARTH stack.";
    <https://w3id.org/sciencelive/o/terms/hasDiscipline> <http://www.wikidata.org/entity/Q1348989>;
    <https://w3id.org/sciencelive/o/terms/hasMethodologyDescription> """Read a window of Sentinel-2 L2A band B04 directly from the public AWS Cloud-Optimized GeoTIFF archive. Compute the window's lon/lat bounding box and
tile it with HEALPix cells on the WGS84 ellipsoid at depth 18 using GRID4EARTH healpix-geo (make_healpix_rectangle_from_lonlat / zone_coverage). Sample the
reflectance at each equal-area cell centre, resample to a regular grid, apodise with a Tukey window, and compute the radially-averaged isotropic power spectrum
with GRID4EARTH healpix-analyse (ps). Because every HEALPix cell covers the same surface area, the spectrum carries no latitude-dependent area weighting. The
whole pipeline is orchestrated by a Snakemake workflow and runs from the public COG in seconds.""";
    <https://w3id.org/sciencelive/o/terms/hasScopeDescription> """Whether the equal-area property of a HEALPix grid yields an angular power spectrum of an optical satellite scene that is free of the latitude-dependent
area weighting a lon/lat grid imposes. In scope: a single regional Sentinel-2 L2A reflectance window analysed end to end on equal-area HEALPix. 

Out of scope: a fully quantified side-by-side lon/lat baseline, multi-scene statistics, atmospheric/cloud effects, and other sensors.""";
    <https://w3id.org/sciencelive/o/terms/targetsClaim> <https://w3id.org/sciencelive/np/RAQH-0xM29Hv1FG6bco_98x1tH4dEHf6yp5IevKtRmOko/equal-area-removes-latitude-bias> .
}

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 "2026-06-28T15:40:34.890Z"^^xsd:dateTime;
    dc:creator <https://orcid.org/0000-0002-1784-2920>;
    dc:license <https://creativecommons.org/licenses/by/4.0/>;
    npx:introduces sub:s2-equal-area-healpix-study;
    npx:wasCreatedAt <https://platform.sciencelive4all.org>;
    <http://www.w3.org/2000/01/rdf-schema#label> "Angular power spectrum of a Sentinel-2 scene on equal-area HEALPix";
    <https://w3id.org/np/o/ntemplate/wasCreatedFromTemplate> <https://w3id.org/np/RAuLEjPp-4dTvPwMkfHggTto1CgjIftiGRAgHlyeEonjQ> .
  
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    npx:signedBy <https://orcid.org/0000-0002-1784-2920> .
}