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National Flood Hazard Layer Web Map Service (WMS) in Google Earth
Written by FEMA
Friday, 09 May 2008
FEMA data products are available for viewing in Google Earth. FEMA offers two applications: "Stay Dry" and "FEMA NFHL." Each is described below, and each has its own .kmz file.
Stay Dry
"Stay Dry" is a focused application that provides basic flood hazard map information from FEMA's National Flood Hazard Layer for a community or an address. It allows you to view flood hazard zones, cross sections and their labels, community names and boundaries, Flood Insurance Rate Map numbers and boundaries, and Letter of Map Revision case numbers and boundaries. The application has two steps: (1) insure that flood hazard information is available for a community and (2) if information is available, view flood information for places in the community.
Version 1.1 fixes a problem in which users reported receiving an error instead of the opening screen for the application.
FEMA NFHL
"NFHL" is a general application that provides for the display of the status of NFHL data availability, flood hazard zones, floodways, Coastal Barrier Resources System and Otherwise Protected Area units, community boundaries and names, base flood elevations, cross sections and coastal transects and their labels, hydraulic and flood control structures, Flood Insurance Rate Map and Letter of Map Revision boundaries and numbers, and Q3 flood hazard data. You control the information displayed by turning layers on and off. A basic knowledge of Google Earth and FEMA flood hazard information will help users of this application.
The name of each layer is hyperlinked to a description of the layer, the map symbols used for the layer, and links to other FEMA web sites relevant to the layer. If a layer is turned on, clicking on the text below the name of the layer (text that starts with "Draws at…") zooms the Google Earth view to a sample display of the layer. Layers are organized for display at one or more of three "eye altitude" (map scale) ranges in Google Earth: status maps at high altitudes, regional overviews of flood hazards at medium altitudes, and detailed flood hazard maps at low altitudes. Click on the hyperlinked folder name of the application to see the altitudes at which data in the layers are displayed.
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