The New York Public Library (NYPL) Map Warper is a tool for digitally aligning ("rectifying") historical maps from the NYPL's collections to match today's precise maps. Visitors can browse already rectified maps or assist the NYPL by aligning a map.
Turn images into interactive map layers that can be displayed in websites, used in mobile phones, tablets, GPS devices, map mashups or opened in the desktop GIS software, Google Maps or Google Earth. A step-by-step interface will smoothly get you through. Free version available.
The Map Historian's Tool for the Analysis of Old Maps
MapAnalyst is a software application for the accuracy analysis of old maps. Its main purpose is to compute distortion grids and other types of visualizations that illustrate the geometrical accuracy and distortion of old maps.
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