Proof of concept.This is an unofficial demo built by Datopian from the City of Evanston's public data. The official portal is data.cityofevanston.org. Questions or feedback: hello@datopian.com

A PortalJS proof of concept · data from the City of Evanston's ArcGIS Hub
Current portal

Bridges

Road and rail bridges in the City of Evanston.

Records
77
Formats
5
Last updated
Jul 3, 2025
Download CSVView on ArcGIS Hub

Download & API

Bridges (CSV)csv
Spreadsheet — attributes, with coordinates for point layers
Download
Bridges (GeoJSON)geojson
GeoJSON — for web maps and GIS tools
Download
Bridges (GeoParquet)geoparquet
Columnar — query with DuckDB / SQL
Download
Bridges (map tiles)pmtiles
Vector tiles — embed in a map
Download
Live ArcGIS layer (source)arcgis
Download

Rendered from PMTiles, queried in-browser from GeoParquet — no server. How this works

Schema

FieldTypeValues
Namestring
Bridge type
BridgeType
string3 values: Rail (63), Road (12), Pedestrian (1)
Crosses over
CrossesOver
string10 values: North Shore Channel (12), CTA Yellow Line (3), Howard St (2)…