Federal Emergency Management Agency
1996
Q3 Flood Data, COFFEE COUNTY, ALABAMA
Washington, DC
Federal Emergency Management Agency
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.
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 are intended to convey certain key features
from the existing hard copy FIRM to provide users with
automated flood risk data. Edge-matching errors, overlaps and
deficiencies in coverage, and similar problems are not corrected
during digitizing or post-processing. These data may be used to
locate SFHAs. More detailed information may be obtained from the
paper FIRM.
1996
Publication date
Irregular
-86.250
-85.750
31.750
31.125
None
FEMA Flood Hazard Zones
Q3 Flood Data
Q3 DLG
Special Flood Hazard Areas
Digital Flood Insurance Rate Maps
None
COFFEE COUNTY
ALABAMA
USA
None
None. Acknowledgment of FEMA would be appreciated in
products derived from these data.
Federal Emergency Management Agency,
Mitigation Directorate
mailing address
500 C Street, S.W.
Washington
District of Columbia
20472
1-800-358-9616
Original data development environment varies. Additional manipulation,
topological structuring, and attribute encoding were undertaken using
ARC/INFO (version 7.0.4) software on a UNIX-based workstation.
Federal Emergency Management Agency
1996
Q3 Flood Data Coverage, COFFEE COUNTY, AL
Washington, DC
Federal Emergency Management Agency
Federal Emergency Management Agency
1996
Q3 Raster FIRM, COFFEE COUNTY, AL
Washington, DC
Federal Emergency Management Agency
Federal Emergency Management Agency
1996
EFIRM, COFFEE COUNTY, AL
Washington, DC
Federal Emergency Management Agency
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 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).
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: 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.
Data completeness for Q3 Flood Data files
reflect 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 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
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, from
FIRMs digitized previously for emergency applications, or may be newly
created files. 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
their 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 on
past floods, and are described by a unique attribute code that
distinguishes them from areas of 1% annual chance flooding derived
from FIRMs.
Flood Insurance Rate Maps 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.
Specifications for the
digitizing of FIRMs to create the 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.
Federal Emergency Management Agency
19901205
Flood Insurance Rate Map, COFFEE COUNTY (Unincorporated Areas), AL
map
Washington, DC
Federal Emergency Management Agency
Panel: 0102390000 - Source_Scale_Denominator: NA
Panel: 0102390025B - Source_Scale_Denominator: 24000
Panel: 0102390050B - Source_Scale_Denominator: 24000
Panel: 0102390075B - Source_Scale_Denominator: 24000
Panel: 0102390100B - Source_Scale_Denominator: 24000
Panel: 0102390125B - Source_Scale_Denominator: 24000
Panel: 0102390150B - Source_Scale_Denominator: 24000
Panel: 0102390175B - Source_Scale_Denominator: 24000
Panel: 0102390200B - Source_Scale_Denominator: 24000
paper
19901205
Effective Date
FIRM1
spatial and attribute information
Federal Emergency Management Agency
19760507
Flood Insurance Rate Map, CITY OF ELBA, AL
map
Washington, DC
Federal Emergency Management Agency
Panel: 0150040001A - Source_Scale_Denominator: 12000
Panel: 0150040002A - Source_Scale_Denominator: 12000
Panel: 0150040003A - Source_Scale_Denominator: 12000
Panel: 0150040004A - Source_Scale_Denominator: 12000
paper
19760507
Effective Date
FIRM2
spatial and attribute information
Federal Emergency Management Agency
19800702
Flood Insurance Rate Map, CITY OF ENTERPRISE, AL
map
Washington, DC
Federal Emergency Management Agency
Panel: 0100450000 - Source_Scale_Denominator: NA
Panel: 0100450002B - Source_Scale_Denominator: 6000
Panel: 0100450003B - Source_Scale_Denominator: 6000
Panel: 0100450004B - Source_Scale_Denominator: 6000
Panel: 0100450005B - Source_Scale_Denominator: 6000
Panel: 0100450006B - Source_Scale_Denominator: 6000
paper
19800702
Effective Date
FIRM3
spatial and attribute information
Federal Emergency Management Agency
19771230
Flood Insurance Rate Map, TOWN OF KINSTON, AL
map
Washington, DC
Federal Emergency Management Agency
Panel: 0102370001A - Source_Scale_Denominator: 9600
Panel: 0102370002A - Source_Scale_Denominator: 9600
paper
19771230
Effective Date
FIRM4
spatial and attribute information
Federal Emergency Management Agency
19770722
Flood Insurance Rate Map, TOWN OF NEW BROCKTON, AL
map
Washington, DC
Federal Emergency Management Agency
Panel: 0102380001A - Source_Scale_Denominator: 9600
Panel: 0102380002A - Source_Scale_Denominator: 9600
paper
19770722
Effective Date
FIRM5
spatial and attribute information
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 which 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 was 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 was projected into
a geographic grid system, using decimal degree latitude and longitude
coordinates, and then converted into an ARC/INFO Export file and
MapInfo native tables files. In addition, the ARC/INFO coverage in UTM
coordinates was converted into a Digital Line Graph file (DLG). All
final files were checked for logical consistency and completeness.
FIRM1-FIRM5
1996
Vector
Point
589
String
1463
GT-polygon composed of chains
590
Universal Transverse Mercator
16
.9996
-87
0.0
500000
0.0
Coordinate Pair
0.61
0.61
meters
North American Datum of 1927
Clarke 1866
6378206.4
294.98
In addition to locational and topological
information, Q3 Flood Data elements are explicitly encoded using
14 MAJOR/MINOR code pairs which identify characteristics about
the attribute items. Each attribute item identifies characteristics
about the Flood Hazard Area, COBRA, Floodway, Political Jurisdiction,
Quadrangle, or FIRM panel. All polygon data elements are encoded with
fourteen feature characteristics. Number of Attributes in Entity: 28
The FEMA "Q3 Flood Data
Specifications" contain a detailed description of each attribute
code and a reference to other relevant information.
Flood Hazard Zones
Flood Hazard Zones are defined in Q3 Flood
Data files by 28 items that describe their Flood Hazard Area, COBRA,
Floodway, Political Jurisdiction, Quadrangle, or FIRM panel.
FEMA FIRM, digital data sources,
or other information as appropriate.
Flood Hazard Zones
Data record comprising 28 fields.
FEMA FIRM, digital data dources, or
other information as appropriate.
Unknown
MAJOR1
3-digit Political Area attribute code
FEMA FIRM, "Q3 Flood Data Specifications"
410
Unknown
Unknown
Unknown
MINOR1
4-digit Political Area attribute code
FEMA FIRM, "Q3 Flood Data Specifications"
Multiple codes-refer to "Q3 Flood Data Specifications"
Unknown
Unknown
Unknown
MAJOR2
3-digit Political Area parameter attribute code: State FIPS
FEMA FIRM, "Q3 Flood Data Specifications"
410
Unknown
Unknown
Unknown
MINOR2
State FIPS code
Federal Information Processing Standard (FIPS)-NIST
Federal Information Processing Standard (FIPS)
National Institute of Standards & Technology (NIST)
Unknown
MAJOR3
3-digit Political Area parameter attribute code: County or Equivalent FIPS
FEMA FIRM, "Q3 Flood Data Specifications"
411
Unknown
Unknown
Unknown
MINOR3
County or equivalent FIPS code
Federal Information Processing Standard (FIPS)-NIST
Federal Information Processing Standard (FIPS)
National Institute of Standards & Technology (NIST)
Unknown
MAJOR4
3-digit Political Area parameter attribute code: Community Number
FEMA FIRM, "Q3 Flood Data Specifications"
412
Unknown
Unknown
Unknown
MINOR4
4-digit Political Area parameter attribute code Community Number
FEMA FIRM,"Q3 Flood Data Specifications"
FEMA Community Identification number
Unknown
MAJOR5
3-digit Map Panel Area attribute code
FEMA FIRM, "Q3 Flood Data Specifications"
420
Unknown
Unknown
Unknown
MINOR5
4-digit Map Panel Area attribute code
FEMA FIRM, "Q3 Flood Data Specifications"
Multiple codes-refer to "Q3 Flood Data Specifications"
Unknown
Unknown
Unknown
MAJOR6
3-digit Map Panel Area attribute parameter code: FIRM Panel Number
FEMA FIRM, "Q3 Flood Data Specifications"
421
Unknown
Unknown
Unknown
MINOR6
4-digit Map Panel Area attribute parameter code: FIRM Panel Number
FEMA FIRM, "Q3 Flood Data Specifications"
Unique numeric sequence derived from FIRMs
Unknown
MAJOR7
3-digit Map Panel Area attribute parameter code: FIRM Panel Alpha Character numeric equivalent
FEMA FIRM, "Q3 Flood Data Specifications"
422
Unknown
Unknown
Unknown
MINOR7
4-digit Map Panel Area attribute parameter code: FIRM Panel Alpha Character numeric equivalent
FEMA FIRM, "Q3 Flood Data Specifications"
0001 [ equivalent to "A"]
0026 [ equivalent to "Z"]
Unknown
MAJOR8
3-digit USGS 7.5-minute Quadrangle Area attribute
USGS Quadrangle Index, "Q3 Flood Data Specifications"
420
Unknown
Unknown
Unknown
MINOR8
4-digit USGS 7.5-minute Quadrangle Area attribute
USGS Quadrangle Index, "Q3 Flood Data Specifications"
0170
Unknown
Unknown
Unknown
MAJOR9
3-digit USGS 7.5-minute Quadrangle Area parameter attribute code: Latitude
USGS Quadrangle Index, "Q3 Flood Data Specifications"
426
Unknown
Unknown
Unknown
MINOR9
4-digit USGS 7.5-minute Quadrangle Area parameter attribute code: Latitude (degrees)
USGS Quadrangle Index, "Q3 Flood Data Specifications"
+0000
+0090
Unknown
MAJOR10
3-digit USGS 7.5-minute Quadrangle Area parameter attribute code: Longitude
USGS Quadrangle Index, "Q3 Flood Data Specifications"
427
Unknown
Unknown
Unknown
MINOR10
4-digit USGS 7.5-minute Quadrangle Area parameter attribute code: Longitude (degrees)
USGS Quadrangle Index, "Q3 Flood Data Specifications"
-0180
+0180
Unknown
MAJOR11
3-digit USGS 7.5-minute Quadrangle Area parameter attribute code: Identifier
USGS Quadrangle Index, "Q3 Flood Data Specifications"
428
Unknown
Unknown
Unknown
MINOR11
4-digit USGS 7.5-minute Quadrangle Area parameter attribute code: Identifier
USGS Quadrangle Index, "Q3 Flood Data Specifications"
0011 ["A1" numeric equivalent]
0088 ["H8" numeric equivalent]
Unknown
MAJOR12
3-digit Flood Hazard Zone Area attribute code
FEMA FIRM, "Q3 Flood Data Specifications"
440
Unknown
Unknown
Unknown
MINOR12
4-digit Flood Hazard Zone Area attribute code
FEMA FIRM, "Q3 Flood Data Specifications"
Multiple codes-refer to "Q3 Flood Data Specifications"
Unknown
Unknown
Unknown
MAJOR13
3-digit Flood Hazard Zone Area attribute code: Floodway
FEMA FIRM, "Q3 Flood Data Specifications"
440
Unknown
Unknown
Unknown
MINOR13
4-digit Flood Hazard Zone Area attribute code: Floodway
FEMA FIRM, "Q3 Flood Data Specifications"
Multiple codes-refer to "Q3 Flood Data Specifications" document
Unknown
Unknown
Unknown
MAJOR14
3-digit Undeveloped Coastal Barrier Area attribute
FEMA FIRM, "Q3 Flood Data Specifications"
440
Unknown
Unknown
Unknown
MINOR14
4-digit Undeveloped Coastal Barrier Area attribute
FEMA FIRM, "Q3 Flood Data Specifications"
Multiple codes-refer to "Q3 Flood Data Specifications"
Unknown
Unknown
Unknown
Federal Emergency Management Agency, Map Service Center
mailing address
6730 Santa Barbara Court
Baltimore
Maryland
21227-5832
1-800-358-9616
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.
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.
DLG
3
Optional
http://www.fema.gov;
Dial-up Instructions: 1-800-358-9616;
Printed Flood Insurance Rate Maps that match this data
set are available from FEMA at the Map Service Center, cited above.
CD-ROM
ISO 9660
None listed in original metadata.
19960321
Federal Emergency Management Agency,
Mitigation Directorate
mailing address
500 C Street, S.W.
Washington
District of Columbia
20472
1-800-358-9616
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998