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11a PROV Map Warper: Processing the State Archives cartographic resources at scale using crowdsourcing
With Map Warper we can turn pixels into real geographic information by layering our historic maps onto a web mapping tool. This process called rectification allows us to visualize how places have evolved over time. Very simply, the user places markers or ‘ground control points’ on the historic map and on corresponding points in the exact same location on the real world. The open source Map Warper software developed by Tim Waters then assigns lat/long values to those points as well as the x/y position of the pixels in the map image corresponding to those points. The result is an overlay of the historic map image on top of the contemporary world in the correct location.
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