# North Beach geography

`north-beach.json` is the only geographic file loaded by the game. It contains
16 playable blocks, 12 junctions, 1,507 cropped building polygons, 229 background
street segments, Washington Square, three landmark anchors, and a 147 × 120
terrain grid. There are no geographic API calls during play.

## Sources and attribution

Snapshot: **September 7, 2026 (UTC)**. A snapshot date is not a survey date.

| Layer            | Source                                                                                                | Treatment                                                                                                                                                                                      |
| ---------------- | ----------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Streets          | [DataSF Streets – Active and Retired](https://data.sfgov.org/d/3psu-pn9h), San Francisco Public Works | Active centerlines; joins use the city's CNN intersection IDs. Each playable block retains its contributing CNNs.                                                                              |
| Buildings        | [DataSF Building Footprints](https://data.sfgov.org/d/ynuv-fyni), City and County of San Francisco    | Historic 2010-derived footprints with later refinements. Cropped polygons retain holes and source building IDs. Median height comes from `hgt_median_m`, falling back to `hgt_mediancm / 100`. |
| Hills            | [DataSF Elevation Contours](https://data.sfgov.org/d/6d73-6c4f), Department of Technology             | Historical five-foot contours, in **San Francisco Elevation Datum**. Convert feet to metres with 0.3048; do not confuse this datum with the building dataset's NAVD88 fields.                  |
| Park and anchors | [© OpenStreetMap contributors](https://www.openstreetmap.org/copyright)                              | Washington Square Park way 18583270; Saints Peter and Paul Church 29902626; City Lights Booksellers 32858754; Coit Tower 28824850. Full ways are read from the public OSM API.                 |

The city datasets carry the [Open Data Commons Public Domain Dedication and
License (PDDL)](https://opendatacommons.org/licenses/pddl/1-0/).
The OSM-derived park and landmark records, including the Coit Tower height
annotation, are available under the [Open Database License (ODbL)
1.0](https://opendatacommons.org/licenses/odbl/1-0/). Their editable source and
processed records are provided here. OSM attribution also appears in the game’s
About panel. The data is used for a simplified game environment, not navigation
or surveying.


## Download the data

- [Processed geographic data](north-beach.json)
- [Editable OSM source records](source/places.json.gz)

The production route additionally connects Columbus Avenue at Broadway to Jack Kerouac Alley using DataSF CNN 4291000. Gameplay uses 17 street segments and 13 nodes.