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                        "@value": "  ELLIPSOID ANALYSIS (HEALPix depth 9, sphere vs WGS84):\n                                                        \n  | Region        | Center lat | Pixels in different cell | Jaccard similarity |                                                                  \n  |---------------|------------|--------------------------|-------------------|                                                                   \n  | Equatorial    | 0°         | 26.6%                    | 0.9951            |                                                                   \n  | Mid-latitude  | +48°       | 98.4%                    | 0.9844            |                                                                   \n  | High-latitude | +62°       | 90.8%                    | 0.9868            |\n  | Arctic        | +78°       | 52.6%                    | 0.9908            |                                                                   \n                                                                               \n  At mid-latitudes (Mediterranean, +48°), nearly every pixel (98.4%) is assigned to a different HEALPix cell when using sphere vs WGS84 ellipsoid.\n   Polygon coverage Jaccard similarity drops to 0.9844, indicating measurable differences in spatial coverage. The effect peaks at mid-latitudes  \n  where the WGS84 ellipsoid deviates most from a sphere, and decreases towards the equator and poles. "
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