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Manhattan, and countless others, many Americans -- and fans of television and film throughout the world -- have at least some basic understanding of the geography of New York, particularly of the borough of Manhattan. The web site Time Formations is an interesting opportunity to explore Geographic Information Systems (GIS), building on the basics to explore an endless array of potential combinations of spatial variables.
For the image above, I chose to click "on" every data layer available -- great fun and colorful, if not particularly useful for analysis. In reality, geographers can use tools like this to look systematically at relationships among many spatially-variable conditions. Prior to GIS, it was often difficult to compare variables that were mapped in different ways or at different scales. Analysis in such situations still requires some professional care, but GIS does facilitate many novel approaches to spatial research.
December 10, 2012 Update 1: Artist and cartographer Jenni Sparks has brought her skills to a different kind of map of the city -- a hand drawing of the iconic island at a delightfully detailed scale. Like a modern, urban Erwin Raisz, she brings the landscape to life and invites exploration. The relatively small-scale overview below is posted along with several larger-scale samples on her blog, which includes a link for purchasing the entire map. I join Sparks in being grateful that New York has survived (for the most part) Super Storm Sandy.
December 10, 2012 Update 2: In Mapping Sandy's Reach, I point to an interactive map that allows users to find out which of these familiar places were recently flooded. Some of them still struggle with recovery five weeks after the storm dissipated.