README.md

metadata

license: other
license_name: bgi-wgm2012-academic-use
license_link: https://bgi.obs-mip.fr/grids-and-models-2/grids-and-models-2-2/
pretty_name: World Gravity Map 2012 (WGM2012) — Modernized GeoParquet
tags:
  - geophysics
  - gravity
  - earth-science
  - geospatial
  - geoparquet
  - gis
  - remote-sensing
task_categories:
  - other
size_categories:
  - 10M<n<100M

Quick Links

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World Gravity Map 2012 (WGM2012) — Modernized

Global 2′ × 2′ gravity anomaly grids — Bouguer and free-air — from the Bureau Gravimétrique International (BGI), converted into a partitioned, machine-readable GeoParquet dataset for AI systems, APIs, GIS, and scientific applications.

Sourced via NORA Research Lab's own AGDFS gravity endpoint (tiled global fetch at full native resolution) rather than a fresh BGI portal download.

Contents

• geoparquet/ — point-based GeoParquet partitions (EPSG:4326), one file per 10° latitude band
• metadata.json — provenance, citation, value ranges, license, known gaps

Columns

Column	Description
longitude / latitude	Grid cell centroid (degrees, WGS84)
bouguer_anomaly_mgal	Complete spherical Bouguer anomaly (mGal)
freeair_anomaly_mgal	Surface free-air anomaly, Molodenski (mGal)
geometry	Point geometry (WGS84)

Known gap: Isostatic anomaly (Airy-Heiskanen, Tc=30km) is part of the original WGM2012 release but is not currently exposed by the AGDFS gravity endpoint, so it is not included here. See metadata.json for details — it can be added later if that layer becomes available.

Source & 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

License

Academic/research use per BGI terms — no warranty on accuracy; BGI is not responsible for consequences of use.

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Modernized by NORA Research Lab.