s_fld_haz_base_flood_elevations

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 20210318
Title: s_fld_haz_base_flood_elevations
Edition: Version 1.1.1.0
Geospatial_Data_Presentation_Form: FEMA-NFHL
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: Federal Emergency Management Agency
Online_Linkage: https://msc.fema.gov
Description:
Abstract:
Flood Hazard Base Flood Elevation features for the State of Hawaii as of May, 2021. Statewide GIS Program created the statewide layer by merging all county layers (downloaded on May 1, 2021), as the Statewide layer was not available from the FEMA Map Service Center. For more information, please refer to summary metadata: https://files.hawaii.gov/dbedt/op/gis/data/s_fld_haz_base_flood_elevations.pdf or contact Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, HI 96804; (808) 587-2846; email: gis@hawaii.gov; Website: https://planning.hawaii.gov/gis. The National Flood Hazard Layer (NFHL) data incorporates all Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM 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 FIRM Database is derived from Flood Insurance Studies (FISs), previously published 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 FEMA. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all FIRM Databases and corresponding LOMRs available on the publication date of the data set. The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Datum of 1983.
Purpose:
Flood Hazard Base Flood Elevation features for the State of Hawaii as of May, 2021. Statewide GIS Program created the statewide layer by merging all county layers (downloaded on May 1, 2021), as the Statewide layer was not available from the FEMA Map Service Center. For more information, please refer to summary metadata: https://files.hawaii.gov/dbedt/op/gis/data/s_fld_haz_base_flood_elevations.pdf or contact Hawaii Statewide GIS Program, Office of Planning and Sustainable Development, State of Hawaii; PO Box 2359, Honolulu, HI 96804; (808) 587-2846; email: gis@hawaii.gov; Website: https://planning.hawaii.gov/gis. The FIRM is the basis for floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP). Insurance applications include enforcement of the mandatory purchase requirement of the Flood Disaster Protection Act, which "... requires the purchase of flood insurance by property owners who are being assisted by Federal programs or by Federally supervised, regulated or insured agencies or institutions in the acquisition or improvement of land facilities located or to be located in identified areas having special flood hazards, " Section 2 (b) (4) of the Flood Disaster Protection Act of 1973. In addition to the identification of Special Flood Hazard Areas (SFHAs), the risk zones shown on the FIRMs are the basis for the establishment of premium rates for flood coverage offered through the NFIP. The FIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. The FIRM Database serves to archive the information collected during the Flood Risk Project.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20200622
Currentness_Reference: Publication Date
Status:
Progress: In work
Maintenance_and_Update_Frequency: Monthly
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -159.715291
East_Bounding_Coordinate: -154.736815
North_Bounding_Coordinate: 22.215957
South_Bounding_Coordinate: 18.893580
Keywords:
Theme:
Theme_Keyword_Thesaurus: FEMA NFIP Topic Category
Theme_Keyword: NFIP
Theme_Keyword: Special Flood Hazard Area
Theme_Keyword: FIRM Database
Theme_Keyword: Riverine Flooding
Theme_Keyword: FIRM
Theme_Keyword: FEMA Flood Hazard Zone
Theme_Keyword: Floodway
Theme_Keyword: SFHA
Theme_Keyword: Base Flood Elevation
Theme_Keyword: Coastal Flooding
Theme_Keyword: Flood Insurance Rate Map
Theme_Keyword: Coastal Barrier Resources System
Theme_Keyword: CBRS
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: structure
Theme_Keyword: inlandWaters
Theme_Keyword: environment
Theme_Keyword: hydrology
Theme_Keyword: transportation
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: NGDA Portfolio Themes
Theme_Keyword: Elevation Theme
Theme_Keyword: National Geospatial Data Asset
Theme_Keyword: NGDA
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Vermont
Place_Keyword: Indiana
Place_Keyword: Marshall Islands
Place_Keyword: South Carolina
Place_Keyword: New Mexico
Place_Keyword: Maine
Place_Keyword: Florida
Place_Keyword: California
Place_Keyword: Oklahoma
Place_Keyword: Federated State of Micronesia
Place_Keyword: Idaho
Place_Keyword: North Carolina
Place_Keyword: New York
Place_Keyword: Wyoming
Place_Keyword: Kentucky
Place_Keyword: Palau
Place_Keyword: Virgin Islands
Place_Keyword: Iowa
Place_Keyword: Delaware
Place_Keyword: Colorado
Place_Keyword: South Dakota
Place_Keyword: Puerto Rico
Place_Keyword: Georgia
Place_Keyword: Kansas
Place_Keyword: Massachusetts
Place_Keyword: Rhode Island
Place_Keyword: Alabama
Place_Keyword: North Dakota
Place_Keyword: West Virginia
Place_Keyword: Hawaii
Place_Keyword: Arkansas
Place_Keyword: Michigan
Place_Keyword: Guam
Place_Keyword: Virginia
Place_Keyword: Nebraska
Place_Keyword: Montana
Place_Keyword: Utah
Place_Keyword: Alaska
Place_Keyword: Connecticut
Place_Keyword: Tennessee
Place_Keyword: New Hampshire
Place_Keyword: Oregon
Place_Keyword: Nevada
Place_Keyword: New Jersey
Place_Keyword: Mississippi
Place_Keyword: Arizona
Place_Keyword: American Samoa
Place_Keyword: Texas
Place_Keyword: Wisconsin
Place_Keyword: Washington
Place_Keyword: Missouri
Place_Keyword: Ohio
Place_Keyword: U.S. Minor Islands
Place_Keyword: Pennsylvania
Place_Keyword: Minnesota
Place_Keyword: Louisiana
Place_Keyword: Maryland
Place_Keyword: Northern Mariana Islands
Place_Keyword: District of Columbia
Place_Keyword: Illinois
Access_Constraints: None
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Federal Emergency Management Agency
Contact_Address:
Address_Type: mailing
Address: 500 C Street, S.W.
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20472
Country: US
Contact_Voice_Telephone: 1-877-336-2627
Contact_Electronic_Mail_Address: mscservices@riskmapcds.com
Data_Set_Credit: Federal Emergency Management Agency (FEMA)
Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The NFHL incorporates all FIRM Databases published by FEMA and any LOMRs that have been issued against those databases since their publication date. The NFHL consists of vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and FIRM Database are issued as the official designation of the SFHAs. As such they are adopted by local communities and form the basis for administration of the NFIP. For these purposes they are authoritative. Provisions exist in the regulations for public review, appeals and corrections of the flood risk information shown to better match real world conditions. As with any engineering analysis of this type, variation from the estimated flood heights and floodplain boundaries is possible. Details of FEMA's requirements for the FISs and flood mapping process that produces these data are available in the Guidelines and Standards for Flood Risk Analysis and Mapping. Attribute accuracy was tested by manual comparison of source graphics with hardcopy plots and a symbolized display on an interactive computer graphic system. Independent quality control testing of the individual FIRM Database components of the NFHL was also performed. To obtain more detailed information in areas where Base Flood Elevations (BFEs) and/or floodways have been determined, users are encouraged to consult the Flood Profiles and Floodway Data and/or Summary of Stillwater Elevations tables contained within the FIS reports that accompany the individual FIRM Database components of the NFHL. Users should be aware that BFEs shown in the S_BFE table may represent rounded whole-foot elevations. These BFEs are intended for flood insurance rating purposes only and should not be used as the sole source of flood elevation information. Accordingly, flood elevation data presented in the FIS report must be used in conjunction with the FIRM for purposes of construction and/or floodplain management. The 1-percent-annual-chance water-surface elevations shown in the S_XS table match the regulatory elevations shown in the FIS report.
Logical_Consistency_Report:
When FEMA revises an FIS, adjacent studies are checked to ensure agreement between flood elevations at the boundaries. Likewise flood elevations at the confluence of streams studied independently are checked to ensure agreement at the confluence. The FIRM and the FIS are developed together and care is taken to ensure that the elevations and other features shown on the flood profiles in the FIS agree with the information shown on the FIRM. However, the elevations as shown on the FIRM may represent rounded whole-foot elevations. They must be shown so that a profile recreated from the elevations on the FIRM will match the FIS profiles within one half of one foot.
Completeness_Report:
Data contained in the NFHL reflects the content of the source materials. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. With new mapping, FEMA plans to maintain full detail in the spatial data it produces. However, older information is often transferred from existing maps where some generalization has taken place. Flood risk data are developed for communities participating in the NFIP for use in insurance rating and for floodplain management. Flood hazard areas are determined using statistical analyses of records of river flow, storm tides, and rainfall; information obtained through consultation with the communities; floodplain topographic surveys; and hydrological and hydraulic analysis. Generally, regulatory water surface elevations and/or regulatory floodways are published only for developed or developing areas of communities. For areas where little or no development is expected to occur, FEMA may generate flood risk data without published water surface elevations. Typically, only drainage areas that are greater than one square mile and with an average of one foot of flood depth or greater are studied. Note: The NFHL reflects the most current information available when the distribution data set was created. Currently, not all areas of a State or Territory have effective FIRM Database data. As a result, users may need to refer to the effective FIRM for effective flood hazard information.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The NFHL consists of vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and FIRM Database are issued as the official designation of the SFHAs. As such they are adopted by local communities and form the basis for administration of the NFIP. For these purposes they are authoritative. Provisions exist in the regulations for public review, appeals and corrections of the flood risk information shown to better match real world conditions. As with any engineering analysis of this type, variation from the estimated flood heights and floodplain boundaries is possible. Details of FEMA's requirements for the FISs and flood mapping process that produces these data are available in the Guidelines and Standards for Flood Risk Analysis and Mapping. Horizontal accuracy was tested by manual comparison of source graphics with hardcopy plots and a symbolized display on an interactive computer graphic system. Independent quality control testing of the individual FIRM Database components of the NFHL was also performed.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The NFHL consists of vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and FIRM Database are issued as the official designation of the SFHAs. As such they are adopted by local communities and form the basis for administration of the NFIP. For these purposes they are authoritative. Provisions exist in the regulations for public review, appeals and corrections of the flood risk information shown to better match real world conditions. As with any engineering analysis of this type, variation from the estimated flood heights and floodplain boundaries is possible. Details of FEMA's requirements for the FISs and flood mapping process that produces these data are available in the Guidelines and Standards for Flood Risk Analysis and Mapping. The reliability of the floodplain boundary delineation is quantified by comparing the computed flood elevation to the ground elevation at the mapped floodplain boundary. The tolerance for how precisely the flood elevation and the ground elevation must match varies based on the flood risk class, which is a function of population, population density, and/or anticipated growth in floodplain areas. A horizontal accuracy of +/- 38 feet is used to determine the compliance with the vertical tolerances defined for each risk class. The range of differences between the ground elevation (defined from the topographic data used for the Flood Risk Project) and the computed flood elevation is between +/- 1.0 foot at the 95% confidence interval for areas with high population within the floodplain and/or high anticipated growth and Special Flood Hazard Areas (SFHAs) with high flood risk to +/- one-half the contour interval at the 85% confidence interval for areas with low population and densities within the floodplain and small or no anticipated growth and SFHAs with low flood risk. Independent quality control testing of the individual FIRM Database components of the NFHL was also performed.
Lineage:
Process_Step:
Process_Description:
The NFHL dataset is a compilation of effective FIRM Databases (a collection of the digital data that are used in GIS systems for creating new Flood Insurance Rate Maps) and Letters of Map Change (Letters of Map Amendment and Letters of Map Revision only) that create a seamless GIS data layer for a State or Territory. It is updated on a monthly basis. The FIRM Databases are compiled in conjunction with the hardcopy FIRMs and the final FIS reports. The specifics of the hydrologic and hydraulic analyses performed are detailed in the FIS reports available for each jurisdiction. The results of these studies are submitted in digital format to FEMA. These data and unrevised data from effective FIRMs are compiled onto the base map used for FIRM publication and checked for accuracy and compliance with FEMA standards. As new FIRM Databases are received the individual FIRM layers are sewn into the nationwide layers of the NFHL. LOMRs for the FIRM Databases in the NFHL are cut directly into the NFHL data layers as they are being produced and finalized.
Process_Date: 20150130
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 9881
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 HARN UTM Zone 4N
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -159.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001
Planar_Distance_Units: meter
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983 HARN
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: s_fld_haz_base_flood_elevations
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: DFIRM_ID
Attribute:
Attribute_Label: VERSION_ID
Attribute:
Attribute_Label: BFE_LN_ID
Attribute:
Attribute_Label: ELEV
Attribute:
Attribute_Label: V_DATUM
Attribute:
Attribute_Label: LEN_UNIT
Attribute:
Attribute_Label: SOURCE_CIT
Attribute:
Attribute_Label: Shape_Length
Attribute_Definition: Length of feature in internal units.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Overview_Description:
Entity_and_Attribute_Overview:
The NFHL is made up of several data themes containing both spatial and attribute information. These data together represent the current flood risk for the subject area as identified by FEMA. The attribute tables include SFHA locations, flood zone designations, BFEs, political entities, cross-section locations, FIRM panel information, and other data related to the NFIP.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: FEMA, Flood Map Service Center
Contact_Address:
Address_Type: mailing
Address: P.O. Box 3617
City: Oakton
State_or_Province: Virginia
Postal_Code: 22124
Country: US
Contact_Voice_Telephone: 1-877-336-2627
Contact_Electronic_Mail_Address: mscservices@riskmapcds.com
Contact_Instructions:
Data requests must include the name and FIPS code of each State or Territory covered by the request, along with an MSC account number if applicable.
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Esri Shapefile
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://msc.fema.gov>
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://msc.fema.gov>
Fees: Contact Distributor
Metadata_Reference_Information:
Metadata_Date: 20210811
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Federal Emergency Management Agency
Contact_Person: Flood Map Service Center
Contact_Address:
Address_Type: mailing
Address: 500 C Street, S.W.
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20472
Country: US
Contact_Voice_Telephone: 1-877-336-2627
Contact_Electronic_Mail_Address: mscservices@riskmapcds.com
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Generated by mp version 2.9.12 on Tue Sep 07 17:58:03 2021