SEMCOG publishes 66 open datasets for United States. Browse them live in Vizzie and turn any one into a map or chart.
SEMCOG is the open-data portal for United States, covering Michigan. It runs on ArcGIS Hub, Esri's open-data platform for geographic data. You can browse it directly at maps-semcog.opendata.arcgis.com. Reuse terms are set out in the portal's terms of service (Esri terms apply to the Hub platform; publisher licence governs the data. licenseInfo is free-text — treat as UNDECLARED unless it maps cleanly.).
SEMCOG publishes one licence across its whole catalogue, so 66 datasets here are covered by it even though they carry no licence of their own. That is a stronger position than an undeclared catalogue, where nothing grants permission at all — but the portal's terms are what govern, so read them before you rely on the data. Vizzie resolves each dataset to the same licence and writes the attribution line for you when you export or publish.
Detroit region MPO, and the only portal in either 2026-09 US batch with a real licence rather than a disclaimer. The site-wide Copyright License Agreement is permissive (see the SEMCOG-CLA class), so it is set as the…
No download, no GIS specialist. Opens in Vizzie.