| --- |
| 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 |
| --- |
| |
| <p align="center"> |
| <img src="https://i.ibb.co/B2LTcvL8/file-000000006894820a93711cc9f56a27e4.png" width="100%" alt="WGM2012 Modernized banner"> |
| </p> |
|
|
| <p align="center"> |
| <a href="https://github.com/Nora-Research-Lab"><img src="https://img.shields.io/badge/GitHub-Nora--Research--Lab-181717?logo=github" alt="GitHub"></a> |
| <a href="https://huggingface.co/NoraResearchLab"><img src="https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-NoraResearchLab-yellow" alt="Hugging Face"></a> |
| <a href="https://www.linkedin.com/company/nora-research-lab"><img src="https://img.shields.io/badge/LinkedIn-NORA%20Research%20Lab-0A66C2?logo=linkedin" alt="LinkedIn"></a> |
| <a href="https://x.com/noraresearchlab"><img src="https://img.shields.io/badge/X-@noraresearchlab-000000?logo=x" alt="X"></a> |
| </p> |
|
|
| ## Quick Links |
| - [GitHub](https://github.com/Nora-Research-Lab) |
| - [Hugging Face](https://huggingface.co/NoraResearchLab) |
| - [LinkedIn](https://www.linkedin.com/company/nora-research-lab) |
| - [X](https://x.com/noraresearchlab) |
|
|
| # 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**. |
|
|
