Create README.md

README.md

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+---
+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**.