CITROcredits

The map

Map data © OpenStreetMap contributors, available under the Open Database License.

Every street, building footprint, river, park, railway, transit route, airport and place name in CITRO comes from OpenStreetMap, the map of the world made by its volunteers. We read it from Geofabrik extracts and the Overpass API, and draw it in our own way. The city data CITRO derives from it is shared under the same Open Database License.

The ground

London, Paris, Tokyo, Singapore, Bengaluru, Dubai, Bangkok and Kuala Lumpur stand on GEDTM30:

Global Ensemble Digital Terrain Model 30 m (GEDTM30) v1.2, Ho, Y. F. & Hengl, T., OpenGeoHub — doi:10.5281/zenodo.18887460; method in Ho et al. (2025), PeerJ 13:e19673, doi:10.7717/peerj.19673.

CC BY 4.0 · modified: resampled to the city grid, building residue removed, smoothed

New York and San Francisco stand on the U.S. Geological Survey’s lidar bare earth, read from Terrain Tiles on AWS (Mapzen / Tilezen):

United States 3DEP (formerly NED) and global GMTED2010 and SRTM terrain data courtesy of the U.S. Geological Survey. Global ETOPO1 terrain data U.S. National Oceanic and Atmospheric Administration.

The landmarks

The landmarks are modelled by CITRO from their published dimensions, at their real coordinates and true metric scale.

The sound

Every sound is synthesised live in your browser — there are no recordings.

The software

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