# OpenStreetMap data

Positions and outlines of surviving monuments, wall and fort remains, and canals in
`src/world/city.js` are © OpenStreetMap contributors, available under the
[Open Database License (ODbL) 1.0](https://opendatacommons.org/licenses/odbl/1-0/).
See [OpenStreetMap copyright and attribution](https://www.openstreetmap.org/copyright).

The static visitor build includes the distributed city-plan database at `docs/city-plan.js`,
under ODbL 1.0 insofar as it contains OpenStreetMap-derived database material. It records
the coordinate conversion and the measured positions/outlines used by the world.
Historical river geometry, superstructures and other reconstruction choices are described
in `docs/SOURCES.md` and the history registry; modern positions do not establish 1688 forms.

Produced views carry this attribution in the site's About & credits panel. Retain that
attribution and the database offer when redistributing the build. This notice does not
alter the engine's MIT licence or the photographs' CC BY-SA 4.0 licence.