. . . . "HEALPix Discrete Global Grid System defined on the unit sphere (Górski et al. 2005), as implemented in the canonical healpy library, applied to WGS84-referenced data without ellipsoidal correction. " . "HEALPix Discrete Global Grid System defined directly on the WGS84 ellipsoid, with cell boundaries, neighbour relations, and coordinate transformations computed under ellipsoidal geometry (as implemented in the healpix-geo Python package)." . "Cell-area uniformity across the grid; correctness of nearest-neighbour adjacency relations on Earth's actual surface; round-trip accuracy of pixel-to-geographic-coordinate mapping for WGS84-referenced data; preservation of hierarchical refinement (nside doubling) under ellipsoidal geometry." . "Geospatial data referenced to the WGS84 ellipsoid: Earth-observation imagery, oceanographic and atmospheric fields, biodiversity occurrence records, and any data product whose coordinates are given as geographic latitude/longitude on the WGS84 datum. " . . . . . "For geospatial data referenced to the WGS84 ellipsoid, does Hierarchical Equal Area isoLatitude Pixelization (HEALPix) defined directly on the WGS84 ellipsoid yield more accurate cell-area uniformity, neighbour adjacency, and pixel-to-geographic-coordinate mapping than HEALPix defined on the unit sphere (the original Górski et al. 2005 formulation), when applied to Earth-observation, oceanographic, atmospheric, and biodiversity data products? " . . . "HEALPix on the WGS84 ellipsoid versus HEALPix on the unit sphere for geoscience data" . . "Anne Fouilloux" . "2026-05-02T09:57:11.763Z"^^ . . . . . "NP created using Defining a PICO-based research question" . . "RSA" . "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" . "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" . . .