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National Flood Hazard Layer (NFHL)

Metadata Updated: November 13, 2020

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

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Date November 5, 2020
Metadata Created Date November 12, 2020
Metadata Updated Date November 13, 2020
Reference Date(s) January 30, 2015 (publication)
Frequency Of Update monthly

Metadata Source

Harvested from fema-mip-nfhl

Additional Metadata

Resource Type Dataset
Metadata Date November 5, 2020
Metadata Created Date November 12, 2020
Metadata Updated Date November 13, 2020
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 e61ff853-6088-4e1a-8d05-d05645904787
Harvest Source Id 06aebe17-1552-4d85-aec4-b9c4b717ffa0
Harvest Source Title fema-mip-nfhl
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 eng; USA
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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