Fetch Caltrans' All Roads Linear Referencing System (ARNOLD) road-network geometry via ArcGIS REST to support pavement/paving-project mapping in California.
domain: caltrans-gis.dot.ca.gov · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Query the ArcGIS FeatureServer layer at https://caltrans-gis.dot.ca.gov/arcgis/rest/services/CHhighway/All_Roads/FeatureServer/0
Use standard Esri REST query parameters (where, outFields, f=geojson) to filter by route or county
Alternatively bulk-download CSV/GeoJSON/Shapefile mirrors from the 'California All Public Roads Network' dataset on data.ca.gov
Join returned LRS segments to HPMS or local pavement-condition records using route/postmile identifiers
Known gotchas
This is base LRS geometry feeding California's HPMS/ARNOLD submittal — it carries no pavement-condition attributes itself; join to a separate PCI dataset for condition data
Esri REST service/layer paths can be reorganized without notice — confirm the current FeatureServer layer index via the data.ca.gov dataset page rather than hardcoding it long-term
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