Use Constraints: The hardcopy FIRM and FIRM Database and the accompanying FIS are the official designation of SFHAs and Base Flood Elevations (BFEs) for the NFIP. Access & Use Informationįederal Emergency Management Agency (Point of Contact) LOMA points can be viewed in the NFHL Interactive Map on the FEMA GeoPlatform. The location of the LOMA is referenced in the legal description of the letter itself. Letter of Map Amendment (LOMA) point locations are approximate. Using base maps: The minimum horizontal positional accuracy for base map hydrographic and transportation features used with the NFHL is the NSSDA radial accuracy of 38 feet. For more information on the NFHL, see the online resources referenced herein. NFHL data can be viewed with widely available GIS software, including freely available programs that work with GIS shapefiles. Continuously updated, the NFHL serves as a Digital Flood Insurance Rate Map representing the current effective flood data for those communities where maps have been digitized. Updates to the NFHL are issued through Letters of Map Revision (LOMRs) and Letters of Map Amendment (LOMAs). FIRM Databases that become effective are incorporated into the NFHL. Through flood studies, FEMA produces Flood Insurance Study Reports, FIRM Panels, and FIRM Databases. It also has information about the NFIP communities, map panels, cross sections, hydraulic structures, Coastal Barrier Resource System, and base maps such as road, stream, and public land survey data. The GIS data and services are designed to provide the user with the ability to determine the flood zone, base flood elevation, and floodway status for a particular location.
The National Flood Hazard Layer (NFHL) is a compilation of GIS data that comprises a nationwide digital Flood Insurance Rate Map.
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