Query Portland, Oregon's annually-updated Heritage Trees register (trees protected under the city's Heritage Tree ordinance) via ArcGIS Open Data
domain: gis-pdx.opendata.arcgis.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Locate the 'Heritage Trees' dataset on Portland's ArcGIS Open Data hub (gis-pdx.opendata.arcgis.com/datasets/heritage-trees)
Open the dataset's API/data tab to obtain the current FeatureServer query URL, then query with outFields=*&where=1=1 following standard ArcGIS REST conventions
Alternatively use the bulk CSV/GeoJSON/Shapefile download links exposed on the same dataset page
Parse trunk-location point geometry plus attributes describing the basis for heritage designation (age, size, type, historical association, or horticultural value)
Treat the list as authoritative for Portland's City Forester-maintained heritage register, updated annually per the ordinance
Known gotchas
This is Portland's own municipal register — a completely separate dataset/schema from Seattle's, San Jose's, or any other city's heritage-tree program; there is no unified national heritage-tree API
The ordinance requires an annual refresh by the City Forester, so treat the data as a point-in-time snapshot rather than continuously live
Verify the current FeatureServer URL from the dataset page rather than hardcoding it, since ArcGIS Hub service URLs can be republished
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