. . . . . . "Angular power spectrum of a Sentinel-2 scene on equal-area HEALPix" . . . . . "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." . . "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\ntile it with HEALPix cells on the WGS84 ellipsoid at depth 18 using GRID4EARTH healpix-geo (make_healpix_rectangle_from_lonlat / zone_coverage). Sample the\nreflectance at each equal-area cell centre, resample to a regular grid, apodise with a Tukey window, and compute the radially-averaged isotropic power spectrum\nwith GRID4EARTH healpix-analyse (ps). Because every HEALPix cell covers the same surface area, the spectrum carries no latitude-dependent area weighting. The\nwhole pipeline is orchestrated by a Snakemake workflow and runs from the public COG in seconds." . "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\narea weighting a lon/lat grid imposes. In scope: a single regional Sentinel-2 L2A reflectance window analysed end to end on equal-area HEALPix. \n\nOut of scope: a fully quantified side-by-side lon/lat baseline, multi-scene statistics, atmospheric/cloud effects, and other sensors." . . . "Anne Fouilloux" . "2026-06-28T15:40:34.890Z"^^ . . . . . "Angular power spectrum of a Sentinel-2 scene on equal-area HEALPix" . . "RSA" . "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" . "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" . . .