The Library of Congress has the biggest and most comprehensive collection of cartographic materials in the world: “over 5.2 million maps, including 80,000 atlases, 25,000 geospatial datasets, 6,000 reference works, numerous globes and three-dimensional plastic relief models, and a large number of cartographic materials in other formats,” according to their website. You can learn more about the NYPL's Map Division and the resources available to you here. Students in Pratt's School of Information and Library Science made a brief video tutorial that will help you navigate the Map Warper. You can read more about the Map Warper and its uses in this blog post by the NYPL's Geospatial Librarian. When a map is scanned, it exists only as an image file: "warping" the map gives it geographic meaning in the digital world. The Map Warper is a tool that allows users to stretch images of scanned maps onto digital maps to align historical geography with the present. You will need to create a Map Warper account. The easiest place to search for the maps is through the NYPL’s Digital Collections portal. Once you find maps you want to download, you can then go to the NYPL’s Map Warper and search by Image ID. Their collection is especially good for New York City and New York State maps. The New York Public Library’s Map Division has released more than 20,000 historic maps as high resolution downloads under a Creative Commons CCO 1.0 Universal Public Domain Dedication.
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