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Here's a tutorial for using OASIS's maps.
(Courtesy Flatbush Gardener.)

• 2006 property data for NYC (based on the October 2006 update from the city’s Department of City Planning;
• Coastal storm/hurricane impact zones throughout the city. Find out if your property or nearby park, community garden, beach, or boating site might be impacted; and
• "Then and Now" aerial photos from 1996 and 2004. Read more (plus sample maps) at the OASIS wiki.