| { |
| "title": "World Gravity Map 2012 (WGM2012) \u2014 Modernized GeoParquet (Bouguer + Free-air)", |
| "source": "Bureau Gravim\u00e9trique International (BGI), accessed via NORA Research Lab's AGDFS API", |
| "citation": "Bonvalot, S., Briais, A., Kuhn, M., Peyrefitte, A., Vales, N., Biancale, R., Gabalda, G., Moreaux, G., Reinquin, F. & Sarrailh, M. (2012). Global grids: World Gravity Map (WGM2012). Bureau Gravimetrique International. https://doi.org/10.18168/bgi.23", |
| "native_resolution": "2 arc-minutes x 2 arc-minutes", |
| "crs": "EPSG:4326", |
| "gravity_products": [ |
| "Bouguer anomaly (mGal)", |
| "Free-air anomaly, Molodenski (mGal)" |
| ], |
| "known_gaps": "Isostatic anomaly (Airy-Heiskanen, Tc=30km) is part of WGM2012 but not currently exposed by the AGDFS gravity endpoint, so it is not included in this release. Can be added later if that layer becomes available.", |
| "derived_from_models": [ |
| "EGM2008", |
| "DTU10", |
| "ETOPO1 (terrain correction)" |
| ], |
| "total_points": 58320000, |
| "value_ranges_mgal": { |
| "bouguer_anomaly_mgal": [ |
| -528.96435546875, |
| 1005.0118408203125 |
| ], |
| "freeair_anomaly_mgal": [ |
| -388.63299560546875, |
| 990.968017578125 |
| ] |
| }, |
| "format": "GeoParquet (EPSG:4326 point geometry), partitioned by latitude band", |
| "license": "Academic/research use per BGI terms \u2014 no warranty on accuracy; BGI is not responsible for consequences of use.", |
| "modernized_by": "NORA Research Lab", |
| "modernization_date": "2026-09-01", |
| "pipeline": "AGDFS tiled fetch -> Standardization -> Modern Format -> Validation -> Metadata -> AI/API Ready" |
| } |
