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Using Digital Flood Hazard Data in the National Flood Insurance Program. FGDC Coordination Working Group Scott McAfee Paul Rooney. April 5 th , 2005. FEMA is responsible for identifying areas of special flood hazard. FEMA publishes Flood Insurance Rate Maps or Flood Hazard Boundary Maps.
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FGDC Coordination Working Group
April 5th, 2005
FEMA publishes Flood Insurance Rate Maps or Flood Hazard Boundary Maps.
Traditionally published as paper documents.
Paper version was considered the official legal version for the purposes of the NFIP.National Flood Insurance Program (NFIP)
"For the purposes of flood insurance and floodplain management activities conducted pursuant to the National Flood Insurance Program under the National Flood Insurance Act of 1968 (42 U.S.C. 4001 et seq.), geospatial digital flood hazard data distributed by the Federal Emergency Management Agency, or its designee, or the printed products derived from that data, are interchangeable and legally equivalent for the determination of the location of 1 in 100 year and 1 in 500 year flood planes, provided that all other geospatial data shown on the printed product meets or exceeds any accuracy standard promulgated by the Federal Emergency Management Agency.“NFIP Reform Act of 2004
Numerous stakeholders are required to use.
Interpretation can have substantial impacts on specific properties and landowners.Flood Maps Are Key to Regulation
Legal status does not result in costly or damaging disagreements between digital geospatial maps and paper maps.
Encourage the use advanced technology and quality local data to make administration of the NFIP more efficient and effective.Goals
Existing policy already makes it possible for communities to use these digital geospatial products in the administration of the NFIP.
Insurers, lenders and flood determination companies must rely on the paper maps as the official designation flood hazards.Current Status
Stakeholders who have already adopted digital technology will be able to use it for NFIP purposes.
Cost savings can be achieved by reducing the number of paper maps that have to be printed and distributed.Benefits of Digital Data
Base map features have been considered integral to the definition of the flood hazard.
This practice is technically wrong from a mapping standpoint
Users cannot benefit from the capabilities of digital geospatial data and advances in mapping technology with this interpretation.Status of Base Map
FEMA’s new maps include a coordinate grid system as a reference
Define the location of the flood hazard by defining it relative to the NSRS rather than roads.National Spatial Reference System (NSRS)
Locations accurately measured relative to a standard coordinate system will be precisely the same on this paper map as in the digital geospatial version of the map.
Enable communities to substitute their own, more accurate base maps for the default base map provided by FEMA.
New streets can be added or improved local mapping can be used without waiting for FEMA to revised official map.
Coordinate grid as authoritative is less intuitive and more complicated for some maps users to understand.Advantages / Disadvantages
The reform act says, “provided that all other geospatial data shown on the printed product meets or exceeds any accuracy standard promulgated by the Federal Emergency Management Agency.”
Indicates the user may use data that meet FEMA standards, but were not used by FEMA on the original published flood map.Intent of the Reform Act