Q3 Flood Data, West Virginia

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Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 1996
Title: Q3 Flood Data, West Virginia
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Online_Linkage: <http://www.wvgis.wvu.edu>
Description:
Abstract:
The Q3 Flood Data are derived from the Flood Insurance Rate Maps (FIRMs) published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to the earth's surface using the Universal Transverse Mercator (UTM) projection and a zonal coordinate system (units in meters). Specifications for the horizontal control of Q3 Flood Data files are consistent with those required for mapping at a scale of 1:24000. This metadata record is at the dataset level, county level metadata are included with the files when downloaded.
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 1973 Flood Disaster Protection Act). 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 insurance coverage offered through the NFIP. Q3 Flood Data files convey certain key features from the existing hard copy FIRM. Edge-matching errors, overlaps and deficiencies in coverage, and similar problems are not corrected during digitizing or post-processing. The Q3 Flood Data files are inteded to provide users with automated flood risk data that may be used to locate SFHAs. More detailed information may be obtained from the paper FIRM.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1996
Currentness_Reference: Publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -83.0
East_Bounding_Coordinate: -77.5
North_Bounding_Coordinate: 41.0
South_Bounding_Coordinate: 37.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: FEMA Flood Hazard Zones
Theme_Keyword: Q3 Flood Data
Theme_Keyword: Q3 Coverage
Theme_Keyword: Special Flood Hazard Areas
Theme_Keyword: Digital Flood Insurance Rate Maps
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: WEST VIRGINIA
Place_Keyword: USA
Place_Keyword: Barbour County
Place_Keyword: Braxton County
Place_Keyword: Brooke County
Place_Keyword: Cabell County
Place_Keyword: Calhoun County
Place_Keyword: Clay County
Place_Keyword: Gilmer County
Place_Keyword: Grant County
Place_Keyword: Greenbrier County
Place_Keyword: Hardy County
Place_Keyword: Harrison County
Place_Keyword: Jackson County
Place_Keyword: Kanawha County
Place_Keyword: Lewis County
Place_Keyword: Lincoln County
Place_Keyword: Logan County
Place_Keyword: Mcdowell County
Place_Keyword: Marshall County
Place_Keyword: Mason County
Place_Keyword: Mingo County
Place_Keyword: Ohio County
Place_Keyword: Putnam County
Place_Keyword: Raleigh County
Place_Keyword: Randolph County
Place_Keyword: Roane County
Place_Keyword: Summers County
Place_Keyword: Tucker County
Place_Keyword: Tyler County
Place_Keyword: Upshur County
Place_Keyword: Wayne County
Place_Keyword: Wetzel County
Place_Keyword: Wirt County
Place_Keyword: Wood County
Place_Keyword: Wyoming County

Access_Constraints: None
Use_Constraints:
None. Acknowledgment 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, Mitigation Directorate
Contact_Address:
Address_Type: mailing address
Address: 500 C Street, S.W.
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20472
Contact_Voice_Telephone: 1-800-358-9616
Native_Data_Set_Environment:
Original data development environment varies. Additional manipulation, topological structuring, and attribute encoding were undertaken using ARC/INFO software on a UNIX-based workstation.

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The Q3 Flood Data are countywide vector files derived from FEMA FIRMs. The attribute definitions may be found in the "Q3 Flood Data Specifications". Attribute accuracy was tested by manual comparison of source graphic with hardcopy plots and a symbolized display on an interactive computer graphic system. Selected attributes that could not be visually verified were individually queried. In addition, an ARC/INFO Arc Macro Language (AML) software program was applied to the dataset to test the attributes against a master set of valid attributes for the specific data category and a complete set of valid attribute combinations. (See also Entity Attribute Information.)
Logical_Consistency_Report:
Polygon and chain-node topology are present. Certain node-area-line relationships are collected or generated to satisfy topological requirements. Some of these requirements include the following: lines must begin and end at nodes, lines must connect to each other at nodes, lines do not extend through nodes, left and right areas are defined for each line segment and are consistent throughout the files, and the lines representing the limits of the file neatlines are free of gaps. Tests of logical consistency were performed by ARC/INFO software modules. Check plots were made to test for leaks in all internal polygons.
Completeness_Report:
Data completeness for Q3 Flood Data files reflects the content of the source graphic. Features may have been eliminated or generalized on the source graphic, due to scale and legibility constraints. 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 analysis of records of river flow, storm tides, and rainfall; information obtained through consultation with the communities: floodplain topographic surveys; and hydrologic 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 undeveloped 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. Q3 Flood Data may be derived from DFIRM-DLGs, from FIRM-DLGs, or from FIRMs digitized previously for emergency applications, or they may be newly created. In Q3 Flood Data derived from older data sets, certain items may not have been captured or may have been captured differently from the current Q3 Flood Data specifications. In some cases, preliminary FIRM data have been included in the Q3 Flood Data files. These data have been provided to the community for review and comment, and may be subject to change before their final publication date. In addition, in some cases, areas designated as Flood Prone Areas on maps prepared by USGS and FIA have been included in the Q3 Flood Data files. These areas were delineated based on available information of past floods and are described by a unique attribute code that distinguishes them from areas of 1% annual chance flooding derived from FIRMs. FIRMs continually undergo revisions and updates. Some of these revisions are effected by letter (Letter of Map Revision [LOMR], Letter of Map Amendment [LOMA]). Q3 Flood Data may not reflect the most current information or information that is not mappable at the publication scale of the FIRM. To obtain the latest information, contact the address listed under distributor.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Specifications for the digitizing of FIRMs to create Q3 Flood Data are consistent with those requirements for mapping at a scale of 1:24000. Horizontal control of Q3 Flood Data was established using USGS quadrangle maps at 1:24000 or other standard scales. Users should assess the horizontal positional accuracy of the Q3 Flood Data with regard to the selected base map sources and the requirements of their application. With increased frequency, large-scale spatial data sets are becoming widely available for computer-based geographic information systems. Q3 Flood Data may be used in combination with other digital spatial data; however, users should be aware that scalar enlargements do not enhance the relative accuracy of the Q3 Flood Data.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 19880603
Title: Flood Insurance Rate Map, VILLAGE OF BARBOURSVILLE, WV
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: Panel: 5400170001B

Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19880603
Source_Currentness_Reference: Effective Date
Source_Citation_Abbreviation: FIRM1
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 19870930
Title:
Flood Insurance Rate Map, CABELL COUNTY (Unincorporated Areas), WV
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: Panel: 5400160000

Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19870930
Source_Currentness_Reference: Effective Date
Source_Citation_Abbreviation: FIRM2
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 19900117
Title: Flood Insurance Rate Map, CITY OF HUNTINGTON, WV
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: Panel: 5400180000

Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19900117
Source_Currentness_Reference: Effective Date
Source_Citation_Abbreviation: FIRM3
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: Federal Emergency Management Agency
Publication_Date: 19870930
Title: Flood Insurance Rate Map, TOWN OF MILTON, WV
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other_Citation_Details: Panel: 5400190001B

Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19870930
Source_Currentness_Reference: Effective Date
Source_Citation_Abbreviation: FIRM4
Source_Contribution: spatial and attribute information
Process_Step:
Process_Description:
Q3 Flood Data were produced by either scanning and vectorizing or manually digitizing a hardcopy version of the graphic materials. The scanning and vectorization process captured the digital data as raster data that were vectorized and attributed on an interactive editing station. The manual digitizing process used a digitizing table to capture the digital data; attribution was performed either as the data were digitized or on an interactive edit station after the digitizing was completed. The determination of the production methodology was based on various criteria, including availability of production systems. Four to nine control points per FIRM panel were used for registration during manual digitizing. A projective transformation was performed on the coordinates used in the data collection and editing systems to register the digital data to the Universal Transverse Mercator (UTM) grid coordinates. An ARC/INFO coverage of the Q3 Flood Data was generated and used to create the Q3-DLG file. The Q3 Flood Data were checked for position and attribute accuracy by comparing plots of the digital data to the source graphic and by symbolized display on an interactive computer system. Selected attributes that could not be visually verified were individually queried. In addition, an ARC/INFO Arc Macro Language (AML) software program was applied to the dataset to test the attributes against a master set of valid attributes for the specific data category and a complete set of valid attribute combinations. Source graphics were revised to reflect updates effected by Letters of Map Change (Letter of Map Revision [LOMR], Letter of Map Amendment [LOMA]). These revisions were included in the Q3 Flood Data if they were mappable at the publication scale of the source graphic. Once final, the ARC/INFO coverage is projected into a geographic grid system, using decimal degree latitude and longitude coordinates and then converted into an ARC/INFO Export file.
Source_Used_Citation_Abbreviation: FIRM1-FIRM4
Process_Date: 1996
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 1723
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 4632
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1724
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 17
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: .9996
Longitude_of_Central_Meridian: -81.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution: 0.61
Ordinate_Resolution: 0.61
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum 1927
Ellipsoid_Name: Clark 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Federal Emergency Management Agency, Map Service Center
Contact_Address:
Address_Type: mailing address
Address: 6730 Santa Barbara Court
City: Baltimore
State_or_Province: Maryland
Postal_Code: 21227-5832
Contact_Voice_Telephone: 1-800-358-9616
Contact_Instructions:
Data requests should include the full name of the community or county and the Flood Insurance Rate Map panel number(s) or the 7.5-minute 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:
Digital_Form:
Digital_Transfer_Information:
Format_Name: DLG
Format_Version_Number: 3
Format_Specification: Optional
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://www.fema.gov> or <http://wvgis.wvu.edu>

Digital_Form:
Digital_Transfer_Information:
Format_Name: Arc/Info Export (E00)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://www.fema.gov> or <http://wvgis.wvu.edu>
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Fees: None at <http://wvgis.wvu.edu>
Metadata_Reference_Information:
Metadata_Date: 19960501
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Federal Emergency Management Agency, Mitigation Directorate
Contact_Address:
Address_Type: mailing address
Address: 500 C Street, S.W.
City: Washington
State_or_Province: District of Columbia
Postal_Code: 20472
Contact_Voice_Telephone: 1-800-358-9616
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.7.33 on Mon Jan 26 09:26:02 2004