# Map sources and licensing

VisitorAtlas code: © 2026 Liberty Dynamics, GPLv2 or later (LICENSE.txt).
The renderer uses native WebGL and does not bundle third-party JavaScript.

## Photorealistic (core)

`assets/earth-texture.jpg` is a JPEG conversion (quality 93) of NASA's 2048×1024
Blue Marble image, without added logos or people.

- Dataset/item: https://svs.gsfc.nasa.gov/2915/
- Original: https://svs.gsfc.nasa.gov/vis/a000000/a002900/a002915/bluemarble-2048.png
- NASA SVS states its content is public domain unless otherwise noted:
  https://svs.gsfc.nasa.gov/help/ (Can I use your visualizations?)
- Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.
  Blue Marble data courtesy of Reto Stockli (NASA/GSFC) and NASA's Earth Observatory.
- No NASA endorsement is implied.

## Natural Earth styles

Core bundles small settings-page preview thumbnails derived from the public-domain NASA and Natural Earth sources listed here, plus original vector illustrations for the three data-map modes. The Satellite / Natural Earth texture is included in Core. Other Natural Earth textures and data-map modes are in the Pro add-on.

Natural Earth publishes its raster and vector data in the public domain:
https://www.naturalearthdata.com/about/terms-of-use/
Made with Natural Earth. Authors include Tom Patterson, Nathaniel Vaughn Kelso
and contributors. No third-party geographic data is fetched at runtime.

- Satellite/Natural Earth: Natural Earth II with shaded relief and water, 1:50m,
  version 3.2.0; resized to 4096×2048 JPEG, quality 92.
  https://www.naturalearthdata.com/downloads/50m-raster-data/50m-natural-earth-2/
  https://naturalearth.s3.amazonaws.com/50m_raster/NE2_50M_SR_W.zip
- Political, Dark Earth, Light/Minimal (bundled in Pro): colored rasterizations at 4096×2048 of
  Natural Earth's 1:50m Admin 0 Countries polygons. Public-domain source:
  https://naturalearth.s3.amazonaws.com/50m_cultural/ne_50m_admin_0_countries.zip
  https://www.naturalearthdata.com/downloads/50m-cultural-vectors/50m-admin-0-countries-2/
  Political borders are generalized, unlabeled, and not a statement about disputed
  sovereignty. This is a visual visitor map, not a legal or navigational boundary map.
The source ZIP's undocumented map image is not redistributed in this release.
Custom textures are chosen by site administrators, who must have suitable rights.


