---
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
---

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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](https://agdfs.onrender.com) 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.

---

Modernized by **NORA Research Lab**.