# Terrain data

- Elevation: Mapzen Terrain Tiles on AWS, zoom 7 Terrarium tiles; regional resampling at approximately 1–2 km. https://registry.opendata.aws/terrain-tiles/
- Mapzen attribution: https://github.com/tilezen/joerd/blob/master/docs/attribution.md — includes © European Union, produced using Copernicus data and information; USGS and other source providers.
- Hydrography: Natural Earth 1:10m rivers + lake centerlines and lakes, public domain. https://www.naturalearthdata.com/
- Country outlines: retained from the previous site map.

Relief is vertically exaggerated for legibility. River geometry is generalized, not a navigation chart. Cross-border energy arcs are schematic, not surveyed power-line routes. Plant markers are approximate locations; no station output is inferred from geography.

Regenerate with `python scripts/build-terrain.py` (Pillow required).