DIGITAL FLOOD INSURANCE RATE MAP DATABASE, NORFOLK COUNTY, MASSACHUSETTS

The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). Spatial data is georeferenced to the earth surface using the Wisconsin Transverse Mercator projected coordinate system and the North American Datum of 1983. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:6000.

Data and Resources

Field Value
access_constraints ["Use Constraints: The hardcopy FIRM and DFIRM and the accompanying FISs 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. However the hardcopy flood maps and flood profiles are the authoritative documents for the NFIP. Acknowledgement of FEMA would be appreciated in products derived from these data.", "Access Constraints: None"]
bbox-east-long -69.591
bbox-north-lat 42.74
bbox-south-lat 41.22
bbox-west-long -72.766
contact-email HillierTS@cdm.com
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2009-06-12"}]
frequency-of-update unknown
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-date 2008-09-22
metadata-language eng; USA
metadata_type geospatial
progress completed
resource-type dataset
responsible-party [{"name": "CDM", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-72.766, 41.22], [-69.591, 41.22], [-69.591, 42.74], [-72.766, 42.74], [-72.766, 41.22]]]}
spatial_harvester true
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • base-flood-elevation
  • cbrs
  • ckan
  • coastal-barrier-resources-system
  • coastal-flooding
  • community-all-norfolk-county-communities
  • county-fips-25021
  • county-norfolk
  • dfirm
  • dfirm-database
  • digital-flood-insurance-rate-map
  • fema-cid-25021c
  • fema-flood-hazard-zone
  • firm
  • flood-insurance-rate-map
  • floodplain-mapping
  • floodway
  • geo
  • geoss
  • national
  • nfip
  • north-america
  • region-01
  • riverine-flooding
  • sfha
  • special-flood-hazard-area
  • state-massachusetts
  • united-states
isopen False
metadata_created 2025-11-20T21:35:35.369214
metadata_modified 2025-11-20T21:35:35.369218
notes The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). Spatial data is georeferenced to the earth surface using the Wisconsin Transverse Mercator projected coordinate system and the North American Datum of 1983. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:6000.
num_resources 2
num_tags 30
title DIGITAL FLOOD INSURANCE RATE MAP DATABASE, NORFOLK COUNTY, MASSACHUSETTS