Licenses
What geoprims is built from, and the attribution each licence asks for.
geoprims itself is MIT. Its source is at github.com/clay-good/geoprims, and the verification report lists the digest of every module in this release.
Data shipped with the site
Every dataset is self-hosted, with its SHA-256 checked before it is used. None is fetched from a third party at run time.
| Dataset | Issuer | License |
|---|---|---|
| EGM96 geoid, 15-minute grid EGM96 geoid model by NGA and NASA; 15-minute grid from GeographicLib (C. F. F. Karney). | National Geospatial-Intelligence Agency (EGM96); grid packaged by GeographicLib | Public domain (US Government work); GeographicLib packaging MIT |
| International Geomagnetic Reference Field, 14th generation IGRF-14, International Association of Geomagnetism and Aeronomy. | IAGA Working Group V-MOD | Free to use with attribution (IAGA) |
| NADCON5 first-step grids: each region's old datum to NAD 83 NADCON5 by the National Geodetic Survey (NOAA); grids from PROJ-data. | National Geodetic Survey, NOAA; GeoTIFF packaging by the PROJ project | Public domain (US Government work) |
| World Magnetic Model 2025 World Magnetic Model 2025, NOAA NCEI and BGS. | NOAA NCEI and British Geological Survey | Public domain (US Government work) |
Fonts and the base map
- Geist and Geist Mono, © 2023 Vercel in collaboration with basement.studio, under the SIL Open Font License 1.1. Subset and self-hosted.
- Natural Earth 1:110m land, lakes, and boundaries, public domain. Made with Natural Earth.
Build dependencies
None of these ship to your browser as themselves; they build the static files this site serves.
| Package | Version | License |
|---|---|---|
| @astrojs/svelte | 9.0.1 | MIT |
| astro | 7.3.3 | MIT |
| axe-core | 4.13.0 | MIT |
| playwright | 1.62.1 | MIT |
| svelte | 5.57.0 | MIT |
The Rust core and the MCP server have no third-party runtime dependencies. The MCP server is plain Node with none at all.
Left out on purpose
Some datasets people ask for are not here, and will not be. The reason matters more than the absence:
- what3words
- Its address grid is proprietary and its licence forbids reimplementation, so there is no way to compute it here and show the work.
- Enhanced Magnetic Model (EMM)
- Its high-resolution coefficients are far larger than the World Magnetic Model for a difference almost no practitioner needs, and it would push the offline download past its budget.
- Copyrighted design tables (AASHTO, ASTM, and similar)
- Reproducing the tables would infringe. Tools that need a value from one cite the table and take the value as an input instead.
- Commercial basemap tiles
- Every tile request would tell a third party where you are looking. The map is drawn from public-domain Natural Earth data served from this site.