Identification_Information:
Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 20080220
Title: DIGITAL FLOOD INSURANCE RATE MAP DATABASE, WILSON COUNTY, TENNESSEE
Geospatial_Data_Presentation_Form: Vector and Raster Digital Data
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: Metadata_File_Name: 47189C_20080220_metadata.txt
Online_Linkage: http://www.msc.fema.gov/
Description:
Abstract: The Digital Flood Insurance Rate Map (DFIRM) 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
DFIRM Database is derived from Flood Insurance Studies (FISs), previously
published Flood Insurance Rate Maps (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 the Federal Emergency Management Agency (FEMA). The
file is georeferenced to earth's surface using the UTM projection and coordinate
system. The specifications for the horizontal control of DFIRM data files are
consistent with those required for mapping at a scale of 1:12,000.
Purpose: 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 DFIRM Database presents the flood risk information depicted on the FIRM in a
digital format suitable for use in electronic mapping applications. The DFIRM
database is a subset of the Digital FIS database that serves to archive the
information collected during the FIS.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080220
Currentness_Reference: FIRM and FIS effective date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -86.83
East_Bounding_Coordinate: -85.80
North_Bounding_Coordinate: 36.58
South_Bounding_Coordinate: 35.68
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: FEMA Flood Hazard Zone
Theme_Keyword: DFIRM Database
Theme_Keyword: DFIRM
Theme_Keyword: Special Flood Hazard Area
Theme_Keyword: Digital Flood Insurance Rate Map
Theme_Keyword: NFIP
Theme_Keyword: Base Flood Elevation
Theme_Keyword: SFHA
Theme_Keyword: Flood Insurance Rate Map
Theme_Keyword: FIRM
Theme_Keyword: Place
Place_Keyword_Thesaurus: None
Place_Keyword: WILSON COUNTY
Place_Keyword: TENNESSEE
Access_Constraints: None
Use_Constraints: The hardcopy FIRM and DFIRM and the accompanying FISs 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.  However the hardcopy flood maps and
flood profiles are the authoritative documents for the NFIP.

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_Position: Federal Insurance and Mitigation Administration
Contact_Address:
Address_Type: mailing address
Address: 500 C Street, S.W.
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20472
Country: USA
Contact_Voice_Telephone: 1-800-358-9616
Contact_Electronic_Mail_Address: www.msc.fema.gov/
Native_Data_Set_Environment: Original data development environment varies.
Finishing of the data is done using ESRI’s ARC/INFO software.
Cross_Reference:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 20041216
Title: Flood Insurance Rate Map, WILSON COUNTY, TENNESSEE
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Cross_Reference:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: PRELIM
Title: Flood Insurance Study, WILSON COUNTY, TENNESSEE
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Cross_Reference:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 20041216
Title: Raster DFIRM, WILSON COUNTY, TENNESSEE
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: The DFIRM Database consists of countywide vector
files and associated attributes produced in conjunction with the hard copy 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.  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 FEMA’s DFIRM database 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 report that accompanies this DFIRM database.  Users
should be aware that BFEs shown in the S_BFE table 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 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.
Completeness_Report: 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.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: The DFIRM Database consists of
countywide 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.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: The DFIRM Database consists of countywide
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.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 2004
Title: Flood Insurance Study, WILSON COUNTY, TENNESSEE and incorporated areas.
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: The hydrologic and hydraulic analyses for the FIS
dated November 12, 2002, were prepared by the Arcadis Geraghty & Miller, Inc,
for the Federal Emergency Management Agency (FEMA), under
Contract No. EMW-97-CO-0139. That work was completed in December
1995. Denominator_of_Source_Scale: 2400-12000.
Source_Scale_Denominator: 12,000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20021121
Source_Currentness_Reference: Effective Date
Source_Citation_Abbreviation: FIS1
Source_Contribution: Spatial and attribute information for political entities, cross sections, floodplain information, BFEs, station start descriptions, general structures, coastal transects, and some feature names.
Source_Information:
Source_Citation:FIS1
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 2004
Title: Flood Insurance Study
Geospatial_Data_Presentation_Form: Map and report
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: 
Denominator_of_Source_Scale: 4800-24000.
Source_Scale_Denominator: 12,000
Type_of_Source_Media: Paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20041216
Source_Currentness_Reference: FIS Effective dates
Source_Citation_Abbreviation: FIS2
Source_Contribution: Spatial and attribute information, floodplain widths,
BFEs, floodplain location.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 1998
Title: Flood Insurance Study Report, WILSON COUNTY, TENNEESSEE and incorporated areas.
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: For this countywide FIS, the hydrologic and hydraulic
analyses were prepared by USACE for FEMA, under Inter-Agency Agreement No.
EMW-94-C-0019. This work was completed in October 1995.
Denominator_of_Source_Scale: 2400-12000.
Source_Scale_Denominator: 12000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19980701
Source_Currentness_Reference: Effective Date
Source_Citation_Abbreviation: FIS3
Source_Contribution: Spatial and attribute information, floodplain widths,
BFEs, floodplain location.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Town of WILSON COUNTY, TENNESSEE and incorporated areas.
Publication_Date: 20041216
Title: Base map for WILSON COUNTY, TENNESSEEand incorporated areas.
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: WILSON COUNTY, TENNESSEE and incorporated areas.
Publisher: Town of WILSON COUNTY, TENNESSEE Stormwater Management
Other_Citation_Details: These files were photogrammetrically compiled at
scales of 1"=200' (urban areas) and 1"=400' (rural areas) from aerial
photographs.
Source_Scale_Denominator: 4,800
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20041216
Source_Currentness_Reference: ground conditions
Source_Citation_Abbreviation: BASE1
Source_Contribution: Location of corporate and county boundaries
Source_Information: Wilson County digital corporate limits
Source_Citation:BASE1
Citation_Information:
Originator: Wilson County GIS Department
Publication_Date: 20020601
Title: WILSON County digital corporate limits
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Lebanon, TN
Publisher: Wilson County Geographic Information Systems Department
Other_Citation_Details: These files were photogrammetrically compiled at scales
of 1"=200' (urban areas) and 1"=400' (rural areas) from aerial photographs.
Source_Scale_Denominator: 4,800
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20020601
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation: BASE2
Source_Contribution: Location of roads, railroads, bridges, streams and other
physical features shown.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1994
Title: Digital Orthophoto Quadrangle
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details: The digital orthophoto quadrangle (DOQ) is a 1-meter
ground resolution, quarter-quadrangle (3.75-minutes of latitude by 3.75-minutes
of longitude) image cast on the Universal Transverse Mercator Projection (UTM)
on the North American Datum of 1983 (NAD83).  The imagery is based on
panchromatic black and white (or color infra-red) NAPP or NAPP-like photography.
Source_Scale_Denominator: 12,000
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20041216
Source_Currentness_Reference: ground conditions
Source_Citation_Abbreviation: BASE3
Source_Contribution: Location of roads, railroads, bridges, streams and other
physical features shown.
Process_Step:
Process_Description: The DFIRM Database is compiled in conjunction with the
hardcopy FIRM and the final FIS report. The specifics of the hydrologic and
hydraulic analyses performed are detailed in the FIS report. 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 DFIRM
publication and checked for accuracy and compliance with FEMA standards.
Source_Used_Citation_Abbreviation: FIS1-FIS3, BASE1-BASE3
Process_Date: 1994
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector and raster
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Raster_Object_Information:
Raster_Object_Type: Pixel
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
    Planar:
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name: State Plane Coordinate System 1983
        State_Plane_Coordinate_System:
          SPCS_Zone_Identifier: 4100
Lambert_Conformal_Conic:
Standrd_Parallel: 35.250000
Standard_Parallel: 36.416667
Latitude_of_Central_Meridian: 0.0
Latitude_of_Projection_Origin: 34.333333
False_Easting: 1968500.000000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution: 0.000537
Ordinate_Resolution: 0.000537
Planar_Distance_Units: feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum 1988
Altitude_Resolution: 0.03
Altitude_Distance_Units: feet
Altitude_Encoding_Method: Attribute Values
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: The DFIRM Database 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.
Entity_and_Attribute_Detail_Citation: Appendix L of FEMA’s Guidelines and
Specifications for FEMA Flood Hazard Mapping Partners contains a detailed
Description: of each attribute code and a reference to other relevant
information.

The following tables are included in this data set:
L_Stn_Start
L_comm_Info
study_info
S_BFE
s_Firm_Pan
S_Fld_Haz_Ar
S_Fld_Haz_Ln
S_Label_Ld
S_Label_Pt
S_Perm_Bmk
S_Pol_Ar
S_Pol_Ln
S_Quad_Index
S_Trnsport_Ln
S_Wtr_ln
S_XS

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: FEMA, Map Service Center
Contact_Address:
Address_Type: mailing address
Address: P.O. Box 1038
City: Jessup
State_or_Province: Maryland
Postal_Code: 20794-1038
Country: USA
Contact_Voice_Telephone: 1-800-358-9616
Contact_Electronic_Mail_Address: www.msc.fema.gov/
Contact_Instructions: Data requests must include the full name of the
community or county and the FIRM panel number(s) or the 7.5- minute series
quadrangle sheet area(s) covered by the request.
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. FEMA will warrant the delivery of
this product in a computer-readable format, and will offer appropriate
adjustment of credit when the product is determined unreadable by correctly
adjusted computer input peripherals, or when the physical medium is delivered in
damaged condition. Requests for adjustment of credit must be made within 90 days
from the date of this shipment from the ordering site.
Standard_Order_Process:
Non-digital_Form: Printed DFIRMs that match this data set are available from
FEMA at the Map Service Center, cited above.
Digital_Form:
Digital_Transfer_Information:
Format_Name: ESRI Shapefile
Format_Version_Number: 1
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Digital_Form:
Digital_Transfer_Information:
Format_Name: MapInfo Interchange file (MIF)
Format_Version_Number: 1
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 1
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Fees: Contact Distributor
Metadata_Reference_Information:
Metadata_Date: 20041119
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Federal Emergency Management Agency
Contact_Position: Federal Insurance and Mitigation Administration
Contact_Address:
Address_Type: mailing address
Address: 500 C Street, S.W.
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20472
Country: USA
Contact_Voice_Telephone: 1-800-358-9616
Contact_Electronic_Mail_Address: www.msc.fema.gov/
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998