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GIS Day 2024 – Community Georeferencing of Sanborn Fire Insurance Maps This past GIS Day, November 20th, 2024, we at the Healthy Regions & Policies Lab hosted a “georeference-a-thon,” and created historical map mosaics of Champaign-Urbana in 1915.

Finally wrote up a blog post about the georeference-a-thon we held at UIUC last November for GIS day: healthyregions.org/2025/01/31/g.... We had a great turnout, especially from different parts of campus outside the geog dept. #sanbornmaps #georeferencing #crowdsourcing #OldInsuranceMaps

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