Map Warper is an open source map warping/georectifying service. With Map Warper you can find and download rectified maps, as well as upload and rectify your own maps. Georectificaiton is the digital alignment of an image with a map of the same area. A number of corresponding control points, such as street intersections, building corners, and railroads, marked on both the image and the map, and then used as reference points in the subsequent processing of the image. This task sheet will take you through the steps of using Map Warper to rectify a historic scanned map.