METADATA FILE NAME: c37183m
Q3 ARC/INFO COVERAGE: C37183
METADATA DATE: 19960520
FGDC-Compliant Metadata for Q3 ARC/INFO Coverage
Identification Information
Citation
Originator: Federal Emergency Management Agency
Publication Date: 1996
Title: Q3 Flood Data, WAKE COUNTY, NORTH CAROLINA
Publication Information
Publication Place: Washington, DC
Publisher: Federal Emergency Management Agency
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.
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
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: 692741.879
East Bounding Coordinate: 758746.957
North Bounding Coordinate: 4001441.157
South Bounding Coordinate: 3930370.138
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: WAKE COUNTY
Place Keyword: NORTH CAROLINA
Place Keyword: USA
Access Constraints: None
Use Constraints:
None. Acknowledgment of FEMA would be appreciated in
products derived from these data.
Point of Contact
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.
Cross Reference
Cross Reference Citation
Originator: Federal Emergency Management Agency
Publication Date: 1996
Title: Q3 DLG, WAKE COUNTY, NC
Publication Information
Publication Place: Washington, DC
Publisher: Federal Emergency Management Agency
Cross Reference Citation
Originator: Federal Emergency Management Agency
Publication Date: 1996
Title: Q3 Raster FIRM, WAKE COUNTY, NC
Publication Information
Publication Place: Washington, DC
Publisher: Federal Emergency Management Agency
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
Originator: Federal Emergency Management Agency
Publication Date: 19920303
Title: Flood Insurance Rate Map, WAKE COUNTY, NC
Geospatial Data Presentation Form: map
Publication Information
Publication Place: Washington, DC
Publisher: Federal Emergency Management Agency
Other Citation Details
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Type of Source Media: paper
Source Time Period of Content
Single Date/Time
Calendar Date: 19920303
Source Currentness Reference: Effective Date
Source Citation Abbreviation: FIRM1
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
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: 7622
SDTS Point and Vector Object Type: String
Point and Vector Object Count: 19888
SDTS Point and Vector Object Type: GT-polygon composed of chains
Point and Vector Object Count: 7623
Spatial Reference Information
Horizontal Coordinate System Definition
Geographic
Latitude Resolution: .000009
Longitude Resolution: .000009
Geographic Coordinate Units: Decimal Degrees
Geodetic Model
Horizontal Datum Name: North American Datum of 1927
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206.4
Demonimator of Flattening Ratio: 294.98
Entity/Attribute Information
Overview Description
Entity and Attribute Overview: In addition to locational and topological
information, Q3 Flood data elements are explicitly encoded using
attribute items. Each attribute item identifies characteristics about
the Flood Hazard Area, COBRA, Floodway, Political Jurisdiction,
Quadrangle, or FIRM panel. All polygon data elements may be
encoded with one or more feature characteristics.
Entity and Attribute Detail Citation: The FEMA "Q3 Flood Data
Specifications" contains a detailed description of each attribute code
and a reference to other relevant information.
Detailed Description
Number of Attributes in Entity: 21
Entity Type
Entity Type label: .PAT
Entity Type Definition: Polygon attribute table comprising 21 items.
Entity Type Definition Source: FEMA FIRM, digital data sources, or
other information as appropriate.
Attribute
Attribute Label: -
Attribute Definition: Polygon attribute table comprising 21 data fields.
Attribute Definition Source: FEMA FIRM, digital data sources, or
other information as appropriate.
Attribute
Attribute Label: AREA
Attribute Definition: Area of polygon/region in square coverage units.
Attribute Definition Source: Computed
Attribute Domain Values:
Enumerated Domain
Enumerated Domain Value: Positive real numbers
Attribute Value Accuracy Information:
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: PERIMETER
Attribute Definition: Perimeter of polygon/region in coverage units
Attribute Definition Source: Computed
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: Positive real numbers
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: #
Attribute Definition: Internal feature number
Attribute Definition Source: Computed
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: Sequential unique positive integer
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: -ID
Attribute Definition: User-assigned feature number
Attribute Definition Source: User-defined
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: Integer
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: FIPS
Attribute Definition: Standard 5-digit State and County FIPS codes
Attribute Definition Source: Federal Information Processing Standard
(FIPS), National Institute of Standards & Technology (NIST)
Attribute Domain Values
Codeset Domain: Federal Information Processing Standard (FIPS)
Codeset Source: National Institute of Standards & Technology (NIST)
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: COMMUNITY
Attribute Definition: Identifies a county, city, or other community
responsible for floodplain management. Numeric value assigned by FEMA.
Attribute Definition Source: FEMA FIRM
Attribute Domain Values
Range Domain
Range Domain Minimum: 0
Range Domain Maximum: 9999
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: FIRM_PANEL
Attribute Definition: Eleven-digit alpha-numeric code identifies portion
of community covered or not covered by a FIRM panel.
Attribute Definition Source: FEMA FIRM
Attribute Domain Values
Unrepresentable Domain: Code comprises a unique alpha-numeric
sequence based on FIPS and FEMA Community and Panel identification
numbers
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: QUAD
Attribute Definition: USGS 7.5-minute quadrangle identifier
Attribute Definition Source: USGS Quadrangle Index
Attribute Domain Values
Unrepresentable Domain: Unique sequence based on latitude and longitude
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: ZONE
Attribute Definition: Flood hazard zone designation
Attribute Definition Source: FEMA FIRM
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: Multiple Codes-refer to "Q3 Flood Data
Specifications"
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: FLOODWAY
Attribute Definition: Channel, river or watercourse reserved for flood
discharge.
Attribute Definition Source: FEMA FIRM
Attribute Domain Values:
Enumerated Domain
Enumerated Domain Value: Multiple Codes-refer to "Q3 Flood Data
Specifications"
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: COBRA
Attribute Definition: Undeveloped Coastal Barrier Area.
Attribute Definition Source: FEMA FIRM
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: Multiple Codes-refer to "Q3 Flood Data
Specifications"
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: SFHA
Attribute Definition: In/Out of flood zone designation
Attribute Definition Source: Determined from data topology
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: "In"
Enumerated Domain Value Definition: Area located within Special
Flood Hazard Area (SFHA)
Enumerated Domain Value: "Out"
Enumerated Domain Value Definition: Area located outside of SFHA
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: SYMBOL
Attribute Definition: Polygon shade symbols for graphic output
Attribute Definition Source: Based on polygon codes
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: Multiple Codes-refer to "Q3 Flood Data
Specifications"
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: PANEL_TYP
Attribute Definition: Type of FIRM panel represented
Attribute Definition Source: FEMA FIRM
Attribute Domain Values
Enumerated Domain
Enumerated Domain Value: Multiple Codes-refer to "Q3 Flood Data
Specifications"
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: ST-FIPS
Attribute Definition: State FIPS code
Attribute Definition Source: Federal Information Processing Standard
(FIPS)-NIST
Attribute Domain Values
Codeset Domain: Federal Information Processing Standard (FIPS)
Codeset Source: National Institute of Standards & Technology (NIST)
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: CO-FIPS
Attribute Definition: County FIPS code
Attribute Definition Source: Federal Information Processing Standard
(FIPS)-NIST
Attribute Domain Values
Codeset Domain: Federal Information Processing Standard (FIPS)
Codeset Source: National Institute of Standards & Technology (NIST)
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: STATE
Attribute Definition: State FIPS code
Attribute Definition Source: Federal Information Processing Standard
(FIPS)-NIST
Attribute Domain Values
Codeset Domain: Federal Information Processing Standard (FIPS)
Codeset Source: National Institute of Standards & Technology (NIST)
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: PCOMM
Attribute Definition: FIRM Community/County Identifier
Attribute Definition Source: FEMA FIRM
Attribute Domain Values
Unrepresentable Domain: Code comprises a unique alpha-numeric
sequence based on FIPS and FEMA Community and Panel identification
numbers
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: PANEL
Attribute Definition: FIRM Panel number and suffix
Attribute Definition Source: FEMA FIRM
Attribute Domain Values
Unrepresentable Domain: Unique sequence based on FEMA FIRM
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: LAT
Attribute Definition: Origin latitude (degrees) of 7.5-minute quadrangle
Attribute Definition Source: USGS Quadrangle Index
Attribute Domain Values
Range Domain
Range Domain Minimum: +0000
Range Domain Maximum: +0090
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: LONG
Attribute Definition: Origin longitude (degrees) of 7.5-minute
quadrangle
Attribute Definition Source: USGS Quadrangle Index
Attribute Domain Values
Range Domain
Range Domain Minimum: -0180
Range Domain Maximum: +0180
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Attribute
Attribute Label: QUAD_UNIT
Attribute Definition: Index number to 7.5 minute quadrangle
Attribute Definition Source: USGS Quadrangle Index
Attribute Domain Values
Unrepresentable Domain: Unique numeric sequence
Attribute Value Accuracy Information
Attribute Measurement Frequency: Unknown
Distribution Information
Distributor
Contact Information
Contact Organization Primary: 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
Non-digital Form: Printed Flood Insurance Rate Maps that match
this data set are available from FEMA at the Map Service Center, cited
above.
Digital Form: ARC/INFO Coverage Format
Digital Transfer Options
Online Option
Computer Contact Information
Network Address
Network Resource Name: http://www.fema.gov
Dialup Instructions:
Access Instructions
Online Computer and Operating System:
Offline Option
Offline Media: CD-ROM
Recording Format: ISO 9660
Metadata Reference Information
Metadata Date: 19960520
Metadata Contact
Contact Organization Primary: 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: 19940608