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Imagery Explorer provides access to 2005 .5 meter orthoimagery for Oregon
Other Data Sources
Data.gov -- Search by topic and filter by data type (e.g. "geospatial")
Data Basin -- From the website: "Data Basin is a science-based mapping and analysis platform that supports learning, research, and sustainable environmental stewardship."
SimplyAnalytics -- Free for OSU Community. User account required. SimplyAnalytics enables users to develop interactive thematic maps and reports using thousands of demographic, business, and marketing data variables. (Cancelled after June 2020)