John Keefe, Steven Melendez and Louise Ma from the WNYC Data News Team. Follow us @datanews, or write us here. Help with the New York state zone shapefiles from Andrew Hill at Vizzuality.

Based on Nov. 11, 2012 interim data from the FEMA Modeling Task Force Hurricane Sandy Impact Analysis, which combines detailed elevation data with U.S. Geological Survey inspections of high water marks.

Coastline inundation zones calculated by the U.S. Army Corps of Engineers using worst-case storm, wave and tide calculations together with elevation data. View the New Jersey hurricane evacuation studies, and the New York state evacuation studies. In New York City, the state zones are superseded by the city's own evacuation zones, which draw from the USACE surveys.

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