2021-12-21 — updated 2023-10-04

Here you’ll find historical USGS quadrangles from the national map. Both the USGS and UC Berkeley Library have scanned their historical map collections and provided them for free download. Unfortunately, while extremely high resolution, these scans are raw representations of the original documents. As a result they’re scanned at odd angles, contain the original map borders with legends and white space, and often have blemishes and markings. Useful for GIS, but not enough to give a good picture of the historical landscape as a whole.

Via a small computer vision script and my Quilt utility, I’ve automatically cropped and corrected the original images and stitched them together into a zoomable in-browser map. It’s like having Google Maps in 1968.


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