DIGITAL FLOOD INSURANCE RATE MAP DATABASE, WASHINGTON COUNTY, ID USA

Resource lineage description

source

source description  Source Contribution: Spatial and attribute information for the index of USGS 7.5-Minute Series Topographic Map boundaries.Source Type online

representative resolution scale:

Scale denominator: 24000

source citation

Title USGS 7.5-Minute Series Topographic Maps

publication  Date   1989-01-01

presentationForm  DIGITAL VECTOR DATA

other Citation Details  USGS has mapped the county with 1:24,000 scale topographic maps (also referred to as 7.5-minute quadrangles). The entire county was mapped by the late 1980s. From the raster topographic maps, a vector index of the USGS topographic maps with its corresponding tile identification number and name was created.

cited responsible party - publisher

organisation Name  U.S. Geological Survey

Contact information

Address

, Reston, VA

cited responsible party - originator

organisation Name  U.S. Geological Survey

source

source description  Source Contribution: Spatial information for base map features.Source Type CD-ROM

representative resolution scale:

Scale denominator: 40000

source citation

Title Preliminary 2004 Digital Ortho Image [Compressed County Mosaic (CCM)] of Washington County, Idaho from Imagery Acquired in the National Agriculture Imagery Program (NAIP)

publication  Date   2004-10-28

presentationForm  imageDigital

other Citation Details  The digital ortho image is a 1-meter ground resolution, mosaic image cast on the Universal Transverse Mercator Projection (UTM) on the North American Datum of 1983 (NAD83). The imagery is based on 24-bit color photography. Vector water features were digitized from the ortho image. A vector index was created from the ortho image.

cited responsible party - publisher

organisation Name  United States Department of Agriculture Farm Service Agency Aerial Photography Field Office (USDA-FSA-APFO)

Contact information

Address

, Salt Lake City, UT

cited responsible party - originator

organisation Name  United States Department of Agriculture Farm Service Agency Aerial Photography Field Office (USDA-FSA-APFO)

source

source description  Source Contribution: Spatial and attribute information for PLSS boundaries.Source Type CD-ROM

representative resolution scale:

Scale denominator: 24000

source citation

Title GCDB Sections

publication  Date   2004-02-01

presentationForm  DIGITAL VECTOR DATA

other Citation Details  Digital vector lines and polygons for PLSS boundaries.

cited responsible party - publisher

organisation Name  Idaho Department of Water Resources

Contact information

Address

, Boise, ID

cited responsible party - originator

organisation Name  U.S. Bureau of Land Management

source

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

representative resolution scale:

Scale denominator: 24000

source citation

Title County_24

publication  Date   2003-01-01

presentationForm  DIGITAL VECTOR DATA

other Citation Details  Digital vector lines and polygons for county boundary.

cited responsible party - publisher

organisation Name  U.S. Department of Agriculture, Natural Resources Conservation Service

Contact information

Address

, Boise, ID

cited responsible party - originator

organisation Name  U.S. Department of Agriculture, Natural Resources Conservation Service

source

source description  Source Contribution: Spatial and attribute information for political boundaries.Source Type online

representative resolution scale:

Scale denominator: 24000

source citation

Title City of Weiser Boundary (2005 city of weiser.shp)

publication  Date   2005-01-01

presentationForm  DIGITAL VECTOR DATA

other Citation Details  Digital vector lines and polygons for City of Weiser boundary were derived from the county?s tax parcels data.

cited responsible party - publisher

organisation Name  Washington County Assessor

Contact information

Address

, Weiser, ID

cited responsible party - originator

organisation Name  Washington County Assessor

source

source description  Source Contribution: Spatial and attribute information for political boundaries.Source Type online

representative resolution scale:

Scale denominator: 24000

source citation

Title r1bnd_ims.

publication  Date   2004-05-13

presentationForm  DIGITAL VECTOR DATA

other Citation Details  Digital vector lines and polygons for National Wildlife Refuge boundary.

cited responsible party - publisher

organisation Name  USFWS, Region 1, Division of Refuge Planning

Contact information

Address

, Portland, OR

cited responsible party - originator

organisation Name  USFWS, Region 1, Division of Refuge Planning

source

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

representative resolution scale:

Scale denominator: 24000

source citation

Title Idaho Land Status of Idaho, GCDB based

publication  Date   2005-02-28

presentationForm  DIGITAL VECTOR DATA

other Citation Details  Digital vector lines and polygons for National Forest, U.S. BLM land, and state land boundaries.

cited responsible party - publisher

organisation Name  U.S. Bureau of Land Management

Contact information

Address

, Boise, ID

cited responsible party - originator

organisation Name  U.S. Bureau of Land Management, Idaho State Office, Geographic Sciences

source

source description  Source Contribution: Spatial and attribute information for permanent benchmarks.Source Type online

representative resolution scale:

Scale denominator: 24000

source citation

Title Horizontal and Vertical Geodetic Control Data for the United States

publication  Date   2004-01-01

presentationForm  DIGITAL VECTOR DATA

other Citation Details  Geodetic data comprise the results of geodetic surveys to determine among other things, latitude, longitude, height, scale, and orientation control. The NGS final product is the geodetic data sheet. Geodetic data sheets are comprehensive summaries of all the published information for a given geodetic reference point, including: the geographic position and/or height based on the current reference datum, condition of the survey mark when it was last visited, a description of where the point is located and how to reach it, and an explanation of the terms used in the data sheet.

cited responsible party - publisher

organisation Name  NOAA, National Geodetic

Contact information

Address

, NOAA Campus, Siver Spring, MD

cited responsible party - originator

organisation Name  NOAA, National Geodetic Survey

source

source description  Source Contribution: Spatial and attribute information for floodplains, cross sections, and general structures.Source Type CD-ROM

representative resolution scale:

Scale denominator: 24000

source citation

Title Flood Insurance Rate Maps (FIRMs) - Washington County, Idaho (Unincorporated Areas); City of Cambridge, Idaho; City of Midvale, Idaho; City of Weiser, Idaho

publication  Date   1987-02-19

presentationForm  DIGITAL RASTER DATA

other Citation Details  Flood hazard features (floodplains, cross sections, and general structures) were digitized from the scanned and georeferenced effective FIRMs.

cited responsible party - publisher

organisation Name  Federal Emergency Management Agency

Contact information

Address

, Washington, DC

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

source

source description  Source Contribution: Spatial and attribute information for base flood elevations (BFEs).Source Type CD-ROM

representative resolution scale:

Scale denominator: 24000

source citation

Title Flood Insurance Rate Maps (FIRMs) - Washington County, Idaho (Unincorporated Areas); City of Cambridge, Idaho; City of Midvale, Idaho; City of Weiser, Idaho

publication  Date   1987-02-19

presentationForm  DIGITAL RASTER DATA

other Citation Details  Base Flood Elevations were digitized from the scanned and georeferenced effective FIRMs and converted to NAVD88.

cited responsible party - publisher

organisation Name  Federal Emergency Management Agency

Contact information

Address

, Washington, DC

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

source

source description  Source Contribution: Spatial and attribute information for floodplain widths, BFEs, cross sections, and floodplain location.Source Type electronic transfer

representative resolution scale:

Scale denominator: 24000

source citation

Title Flood Insurance Mapping Study for Monroe Creek

publication  Date   2007-11-01

presentationForm  mapDigital

other Citation Details  The hydrologic and hydraulic analyses for the FIS dated November, 2007 were performed by WEST Consultants Inc. for FEMA Region X under Contract No. EMS-2001-CO-0068, Task Order Number 15.

cited responsible party - publisher

organisation Name  Federal Emergency Management Agency

Contact information

Address

, Washington, DC

cited responsible party - originator

organisation Name  Federal Emergency Management Agency.

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.