This is a portolan catalog version of https://developer.trimet.org/gis/ - taking the static data layers there and making them fully cloud-native and interactive.
TriMet district boundary. 1 Polygon features covering the TriMet
service district in the Portland, Oregon metropolitan area, published by TriMet
as tm_boundary and last updated at the source on
January 09, 2013.
A single polygon: the legal service district TriMet is chartered to serve. It carries TriMet's own area figures — 533 square miles, 341,554 acres — as attributes, so you do not need to compute area from the geometry.
The district covers most of the urbanized parts of Multnomah, Washington and Clackamas counties. Its edge is not a county boundary and not the Metro urban growth boundary; it is the taxing and service district, and it excludes parts of all three counties.
Agents: see AGENTS.md for join keys, verified query recipes and the caveats that will otherwise cost you a wrong answer.
Preview it on a map, inspect the schema and license, and download the GeoParquet or PMTiles directly.
Read it straight from object storage — DuckDB fetches only the byte ranges it needs, so there is nothing to download first:
Or with GeoPandas:
stops to answer
service questions.Column descriptions are TriMet's own, taken verbatim from
meta_tm_boundary.shtml. The same text is carried in
table:columns in collection.json.
The PMTiles layer is named district-boundary. Styles reference it as ../district-boundary.pmtiles,
so they load unmodified against this directory.
Produced by TriMet GIS (4012 SE 17th Ave, GIS3,
Portland, OR 97202,
gis@trimet.org) and distributed at
developer.trimet.org/gis as tm_boundary.
This collection was produced by converting TriMet's Shapefile to GeoParquet,
keeping its native EPSG:2913 (NAD83(HARN) / Oregon North (ft)), and to PMTiles in
WGS84 for display. No features were added, removed or edited. The exact commands
are in tools/convert.py.
This catalog is generated, and both halves are open source: the catalog at
cholmes/portolan-catalog-trimet and the
data browser at
cholmes/trimet-data-browser. If something here is wrong or
could be better — a description, a column definition, a query, a style —
open an issue or send a pull request. Corrections to
the underlying data go to TriMet at gis@trimet.org.
TriMet distributes these datasets free of charge, but the terms of use do not
grant redistribution rights. Section 4 of TriMet's
Terms of Use reserves
reproduction, modification, distribution and republication of site Content
without written consent; the redistribution license in section 5 covers the Web
Services API, not these GIS downloads. The collections therefore declare
"license": "other" with a link to those terms, rather than claiming an open
license the source does not offer.
Practically: use the data, and contact gis@trimet.org before redistributing it or building a product on it. If you need transit data under clear open terms, TriMet's GTFS feed is the better starting point.