Based at the University of Arizona, the Arizona Regional Image Archive is an "interdisciplinary resource system for digital image and map data for the Sonoran desert region, including the U.S. Southwest and northern Mexico." It is a tremendous resource for geographers, ecologists, planners, and others with a vested interest in the region. First-time visitors to the site will note that the homepage has a News area about recently added items, along with a collection of documents contributed by institutions like the Arizona Remote Sensing Center and the Southwest Watershed Research Center. On the left-hand side of the page, visitors will find an array of satellite images, aerial photos from the 1990s to the present day, and digital elevation models. The site also includes excellent digital topographic maps at a variety of scales. Visitors who plan on making return visits to the site will probably want to sign up for a free user account, as it will allow them to save data sets and materials for future access.
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