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

Annexation Chronology

Annexations by the City of Evanston through the years.

Records
15
Formats
5
Last updated
Jul 3, 2025
Download CSVView on ArcGIS Hub

Download & API

Annexation Chronology (CSV)csv
Spreadsheet — attributes, with coordinates for point layers
Download
Annexation Chronology (GeoJSON)geojson
GeoJSON — for web maps and GIS tools
Download
Annexation Chronology (GeoParquet)geoparquet
Columnar — query with DuckDB / SQL
Download
Annexation Chronology (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
Annexation Year
ANNEXATION_YEAR
string12 values: 1874 (3), 1873 (2), 1863 (1)…
Annexation Date
ANNEXATION_DATE
datetime
Notes
NOTES
string6 values: Annexed to Village of Evanston (5), Annexed to Village of Evanston (2), Annexed to City of Evanston (2)…