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This is a fresh application of the equal-area approach using the GRID4EARTH stack. https://w3id.org/sciencelive/np/RALm0wEYfKg4NKqTwY33LsGKIR7UH0Ut2IgYvX8uEeJMM/s2-equal-area-healpix-study https://w3id.org/sciencelive/o/terms/hasDiscipline http://www.wikidata.org/entity/Q1348989 https://w3id.org/sciencelive/np/RALm0wEYfKg4NKqTwY33LsGKIR7UH0Ut2IgYvX8uEeJMM/s2-equal-area-healpix-study 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). 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