DIGITAL FLOOD INSURANCE RATE MAP DATABASE, CLINTON COUNTY, OHIO, USA

Resource lineage description

source

source description  Source Contribution: Flood hazard areas, flood hazard lines, general structures, cross sectionsSource Type digital

source citation

Title Flood Insurance Study, CLINTON COUNTY, USA and All Jurisdictions.

publication  Date   2010-05-03

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

source

source description  Source Contribution: Quad LayoutSource Type CD-ROM

source citation

Title USGS 1:24000 Topographic Quadrangle Series Index

publication  Date   2010-05-03

cited responsible party - originator

organisation Name  Environmental Systems Research Institute

source

source description  Source Contribution: Orthophoto Imagery Base IndexSource Type raster digitial data

source citation

Title Raster Digital Orthophoto Index

publication  Date   2010-05-03

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

source

source description  Source Contribution: FIRM Panel LayoutSource Type vector digital data

source citation

Title FIRM Panel Layout

publication  Date   2010-05-03

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

source

source description  Source Contribution: BenchmarksSource Type Digital Download

source citation

Title Horizonal and Vertical Geodetic Control Data

publication  Date   2002-06-01

cited responsible party - originator

organisation Name  National Geodetic Survey (NGS)

source

source description  Source Contribution: Political boundaries including state parksSource Type Digital Download

source citation

Title Coporate and County Boundaries

publication  Date   2006-01-01

cited responsible party - originator

organisation Name  Clinton County GIS Department

source

source description  Source Contribution: Street centerlines, railroadsSource Type Digital Download

source citation

Title Road Data

publication  Date   2006-01-01

cited responsible party - originator

organisation Name  Clinton County GIS Department

source

source description  Source Contribution: Water lines, water polygonsSource Type Digital Download

source citation

Title Streams and Water Bodies

publication  Date   2006-01-01

cited responsible party - originator

organisation Name  Clinton County GIS Department

source

source description  Source Contribution: Public Land Survey System lines and areaSource Type Digital Download

representative resolution scale:

Scale denominator: 2000

source citation

Title PLSS Data

publication  Date   2006-01-01

presentationForm  mapDigital

cited responsible party - publisher

organisation Name  Clinton County GIS Department

Contact information

Address

, Wilmington, OH

cited responsible party - originator

organisation Name  Clinton County GIS Department

source

source description  Source Contribution: Digital OrthophotoSource Type Digital Download

representative resolution scale:

Scale denominator: 200

source citation

Title Aerial Photography for Clinton County

publication  Date   420-05-01

presentationForm  imageDigital

cited responsible party - publisher

organisation Name  Clinton County GIS Department

Contact information

Address

, Wilmington, OH

cited responsible party - originator

organisation Name  Clinton County GIS Department

source

source description  Source Contribution: ci416se3402.sid, cw125ne3402.sid, cw125nw3402.sid, cw125se3402.sid, cw125sw3402.sid, cw126ne3402.sid, cw126nw3402.sid, cw126se3402.sid, cw126sw3402.sid, cw127ne3402.sid, cw127nw3402.sid, cw127sw3402.sid, cw128ne3402.sid, cw128nw3402.sid, cw128se3402.sid, cw128sw3402.sid, cw301sw3402.sid, cw304ne3402.sid, cw304nw3402.sid, cw304se3402.sid, cw304sw3402.sid, cw309nw3402.sid, cw309se3402.sid, cw309sw3402.sid, cw310se3402.sid, cw311ne3402.sid, cw311nw3402.sid, cw311se3402.sid, cw311sw3402.sid,cw312ne3402.sid,cw312nw3402.sid,cw312se3402.sid, cw312sw3402.sid,cw317ne3402.sid, cw317nw3402.sid, cw317se3402.sid,cw317sw3402.sid,cw318ne3402.sid, cw318nw3402.sid,cw318se3402.sid,cw318sw3402.sidSource Type Digital Download

representative resolution scale:

Scale denominator: 20000

source citation

Title Digital Orthophoto Quarter Quadrangles

publication  Date   1998-01-01

presentationForm  imageDigital

cited responsible party - publisher

organisation Name  U.S. Geological Survey

Contact information

Address

, Reston, VA

cited responsible party - originator

organisation Name  United States Geologic Survey

AbsoluteExternalPositionalAccuracy

name Of Measure Horizontal Positional Accuracy Report

evaluation Method Description  The DFIRM Database consists of community based vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and DFIRM 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 Specifications for Flood Hazard Mapping Partners. 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 FEMA's DFIRM database was also performed.

AbsoluteExternalPositionalAccuracy

name Of Measure Vertical Positional Accuracy Report

evaluation Method Description  The DFIRM Database consists of community based vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and DFIRM maps 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 Specifications for Flood Hazard Mapping Partners. Vertical 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 FEMA's DFIRM database was also performed.

Completeness Commission

evaluation Method Description  Data contained in the DFIRM Database files reflect 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. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For areas where little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied.

Completeness Omission

evaluation Method Description  Data contained in the DFIRM Database files reflect 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. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For areas where little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied.

ConceptualConsistency

measure Description  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 are 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.