National Flood Hazard Layer (NFHL)

Metadata Updated: September 21, 2017

The National Flood Hazard Layer (NFHL) is a compilation of GIS data that comprises a nationwide digital Flood Insurance Rate Map. 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. 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. Through flood studies, FEMA produces Flood Insurance Study Reports, FIRM Panels, and FIRM Databases. FIRM Databases that become effective are incorporated into the NFHL. Updates to the NFHL are issued through Letters of Map Revision (LOMRs) and Letters of Map Amendment (LOMAs). 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. NFHL data can be viewed with widely available GIS software, including freely available programs that work with GIS shapefiles. For more information on the NFHL, see the online resources referenced herein. 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. Letter of Map Amendment (LOMA) point locations are approximate. The location of the LOMA is referenced in the legal description of the letter itself. LOMA points can be viewed in the NFHL Interactive Map on the FEMA GeoPlatform.

Access & Use Information

Downloads & Resources


Metadata Date May 16, 2016
Metadata Created Date April 4, 2015
Metadata Updated Date September 21, 2017
Reference Date(s) January 30, 2015 (publication)
Frequency Of Update monthly

Metadata Source

Harvested from NFHL Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date May 16, 2016
Metadata Created Date April 4, 2015
Metadata Updated Date September 21, 2017
Reference Date(s) January 30, 2015 (publication)
Responsible Party Federal Emergency Management Agency (Point of Contact)
Contact Email
Access Constraints 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. For the purposes of the NFIP, changes to the flood risk information published by FEMA may only be performed by FEMA and through the mechanisms established in the NFIP regulations (44 CFR Parts 59-78). These digital data are produced in conjunction with the hardcopy FIRMs and generally match the hardcopy map exactly. Acknowledgement of FEMA would be appreciated in products derived from these data., Access Constraints: None
Bbox East Long 147
Bbox North Lat 72
Bbox South Lat -15
Bbox West Long -172
Coupled Resource
Frequency Of Update monthly
Harvest Object Id d6b211f4-71b1-452f-82ea-bfd42432a777
Harvest Source Id 6239ff33-3517-4ccd-bbdd-220beed8bc1e
Harvest Source Title NFHL Harvest Source
Licence No warranty expressed or implied is made by FEMA regarding the utility of the data on any other system nor shall the act of distribution constitute any such warranty.
Metadata Language
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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