FLOODPLAIN, FOREST COUNTY, PA, USA

Resource lineage description

source

source description  Source Contribution: Spatial and attribute information for General Structures (S_Gen_Struct), Profile Baselines (S_Wtr_Lns), and Cross sections (S_XS).Source Type paper

source citation

Title Flood Insurance Study, for Township of Barnett, PA, dated 19861201, Township of Green, PA, dated 19850619, Township of Harmony, PA, dated 19861105, Township of Hickory, PA, dated 19861119, Township of Howe, PA, dated 19870601, Township of Jenks, PA, dated 19850215, Township of Kingsley, PA, dated 19870601, Borough of Tionesta, PA, dated 19861105, Township of Tionesta, PA, dated 19860929

publication  Date   1986-12-01

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

source

source description  Source Contribution: Grid of FIRM panels created for original countywide Flood Insurance Study. Original countywide FIS prepared by GG3, Gannett Fleming, Inc. New countywide Grid of DFIRM panels.Source Type Digitized

representative resolution scale:

Scale denominator: 12000

source citation

Title FOREST COUNTY, PENNSYLVANIA, Digital Flood Insurance Rate Map

publication  Date   2007-07-25

other Citation Details  Grid of FIRM panels created for this countywide Flood Insurance Study. Original countywide FIS prepared by GG3, Gannett Fleming, Inc., Flood hazards were digtized from the effective FIRMs and FBFMs. New countywide Grid of DFIRM panels.

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

source

source description  Source Contribution: Spatial information for roads, railroads, bridges, streams and other physical features shown on DFIRM.Source Type CD-ROM

representative resolution scale:

Scale denominator: 2400

source citation

Title U.S. Geological Survey, USGS High Resolution Orthoimage

publication  Date   2006-01-01

presentationForm  imageDigital

other Citation Details  The digital orthophotography was produced in natural color at an ortho scale of 1:2400 with a 1-foot pixel resolution. The orthophotos were obtained from PASDA. An orthoimage is remotely sensed image data that has been positionally corrected for camera lens distortion, vertical displacement and variations in aircraft altitude and orientation. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. The PAMAP natural color orthoimages were produced at 1-foot pixel resolution. Each orthoimage provides imagery for a 10,000 x 10,000 ft. block on the ground. The projected coordinate system is Pennsylvania State Plane North with a NAD83 datum. There is no image overlap been adjacent files. The orthoimage filenames were derived from the northwest corner of each ortho tile using the first four digits of the northing and easting coordinates referenced to the Pennsylvania State Plane coordinate system, followed by the State designator "PA," and the State Plane zone designator "N."

cited responsible party - publisher

organisation Name  PASDA

Contact information

Address

, State College, PA

cited responsible party - originator

organisation Name  U.S. Geological Survey

source

source description  Source Contribution: Spatial and attribute information for internal community boundaries and transportation lines.(S_POL_AR, S_POL_LN, S_TRNSPORT_LN)Source Type digital vector data

source citation

Title Forest County Municipal Boundaries

publication  Date   2007-01-01

cited responsible party - originator

organisation Name  County of Forest Assessment Office

source

source description  Source Contribution: Spatial information for streams derived from hydrologic processing of LiDAR DEMS, and adjusted to match PAMAP orthoimagery (BASE1).Source Type External Hard Drive

representative resolution scale:

Scale denominator: 12000

source citation

Title Stream Centerlines derived from PAMAP LiDAR DEMS

publication  Date   2009-01-01

other Citation Details  Stream vectors were generated from LIDAR DEMs with a 10ft cell size. LIDAR DEMs were manipulated to remove sinks followed by filling sinks, flow direction and flow accumulation analyses, and create streams. The vectorized stream raster was then smoothed using a PAEK smoothing factor of 80. All processing was perfomed in PA State Plane US feet.

cited responsible party - originator

organisation Name  GG3 (GANNETT FLEMING, INC. CAMP HILL, PA)

source

source description  Source Contribution: Spatial and attribute information for hydrography lines and areas.Source Type CD-ROM

source citation

Title USGS High Resolution NHD Hydrography

publication  Date   2005-01-01

cited responsible party - originator

organisation Name  U.S. Geological Survey

source

source description  Source Contribution: Spatial and attribute information for permanent benchmarks which meet FEMA specifications (S_Perm_Bmk).Source Type download digital file

representative resolution scale:

Scale denominator: 24000

source citation

Title Geodetic bench mark positions and descriptions

publication  Date   2005-01-01

presentationForm  mapDigital

other Citation Details  The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data in the National Spatial Reference System. These geodetic data include bench marks and other control points that provide the base of reference for latitude, longitude, height, scale, orientation, and gravity measurements used throughout the United States.

cited responsible party - publisher

organisation Name  National Geodetic Survey

Contact information

Address

, Silver Spring, MD

cited responsible party - originator

organisation Name  National Geodetic Survey

source

source description  Source Contribution: spatial and attribute information for USGS 7.5-MINUTE QUADRANGLE GRID/INDEX (S_Quad_Index).Source Type download digital file

representative resolution scale:

Scale denominator: 24000

source citation

Title NATIONAL USGS 7.5-MINUTE QUAD INDEX

publication  Date  

presentationForm  mapDigital

cited responsible party - originator

organisation Name  USGS

source

source description  Source Contribution: Spatial and attribute information for political lines and areas.Source Type CD-ROM

source citation

Title Pennsylvania Municipality Boundaries

publication  Date   2005-01-01

presentationForm  mapDigital

cited responsible party - publisher

organisation Name  PASDA

Contact information

Address

, State College, PA

cited responsible party - originator

organisation Name  Pennsylvania Department of Transportation

source

source description  Source Contribution: Spatial and attribute information for PENNDOT public roads downloaded from PASDA as digitized from sources conforming to National Mapping Accuracy Standards for 1:24,000 scale maps.Source Type CD-ROM

source citation

Title Forest County Road Centerlines

publication  Date   2005-01-01

presentationForm  mapDigital

cited responsible party - publisher

organisation Name  PASDA

Contact information

Address

, State College, PA

cited responsible party - originator

organisation Name  Pennsylvania Department of Transportation

source

source description  Source Contribution: Spatial and attribute information for new countywide FIRM panels. BFEs converted from NGVD29 found on the effective FIS flood profiles (FIS1) to NAVD88. Redelineated detailed flood hazards using PAMAP LIDAR data, and new Zone A analyses and mapping performed by GG3.Source Type DVD-ROM

representative resolution scale:

Scale denominator: 12000

source citation

Title New Countywide Flood Hazard Data

publication  Date   2005-01-01

other Citation Details  Cross sections were digitized using effective FIRMs and FBFMs and detailed SFHAs and Zone A flooding was redelineated by GG3 under Contract No. EMP-2003-CO-2606, Task Order 18.

cited responsible party - originator

organisation Name  GG3 (GANNETT FLEMING, INC. CAMP HILL, PA)

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 Floodplain Mapping and Redelineation 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 Floodplain Mapping and Redelineation 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.