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|FEMA Q3 Data Nationwide Bundle - E00, MIF, or DLG format|
Your Price: $225.95
All Available FEMA Q3 Flood Data for the US in ESRI E00, DLG, or MapInfo format!
Note: State or County level coverages can also be downloaded from the GISDataDepot by users having a Premium Account
In its continuing efforts to perform hazards mitigation and to
customer service by expanding the availability of flood risk
Federal Emergency Management Agency (FEMA) has released
the Q3 Flood Data
product. Designed to support FEMA's Response and Recovery
flood insurance policy marketing initiatives, Q3 Flood Data will
in floodplain management, hazards analysis, and risk
The product contains a subset of information derived from
Insurance Rate Maps (FIRMs). While the digital data were
support floodplain management activities, they do not replace
the paper FIRMs.
The Q3 Flood Data are developed by electronically scanning the
effective map panels of existing paper FIRMs. Certain key
digitally captured and then converted into area features
flood insurance zones, political boundaries). Using computer
you can overlay the Q3 Flood Data with your own information
transportation networks, customer addresses, etc.) to display
zones of potential
flood risk and identify future marketing opportunities.
Q3 Flood Data are intended to capture certain key features
from the existing
paper FIRMs. These features include:
> 100-year and 500-year (1% and 0.2% annual chance)
including Zone V areas, certain floodway areas (when present
on the FIRM),
and zone designations.
> Coastal Barrier Resources Act (COBRA) areas.
> Political areas, including community identification number.
> FIRM panel areas, including panel number and suffix.
> U.S. Geological Survey (USGS) 1:24,000 scale topographic
points and neatlines.
The most current FIRM panels are used in the Q3 Flood Data
addition, Letters of Map Amendment (LOMAs) and Letters of
Map Revision (LOMRs),
if they are mappable at the publication scale of the paper FIRM,
into the Q3 Flood Data. However, the user should keep in mind
that changes may
have occurred between the time of the digital Q3 Flood Data
conversion and the
production date of the CD-ROM. Therefore, because of the
dynamic nature of these
revisions and updates, the user should confirm that the most
is being used to meet the needs of her/his desired application.
FEMA intends to
perform bi-annual reviews (and possible revisions) of the Q3
Flood Data CD-ROMs to
ensure the most current and useful data are available to the
The paper FIRMs from which the Q3 Flood Data are extracted
contain no horizontal
control (x/y, latitude/longitude coordinates). However, the
digital Q3 Flood Data
specifications require horizontal control consistent with the
for mapping at a scale of 1:24,000. Horizontal control is
typically accomplished by
fitting the flood data to a USGS 1:24,000 scale topographic
matching errors, overlaps and underlaps in coverage, and similar
problems are not
corrected during the Q3 Flood Data conversion process.
The Q3 Flood Data are distributed in USGS Digital Line Graph
(DLG) format, compatible
with FEMA document FIA-21/October 1993 ("Standards for
Digital Flood Insurance
Rate Maps"). The Q3 data are also provided in proprietary
formats (ARC/INFO (R)
and MapInfo (R)) for use with numerous compatible desk-top
mapping and Geographic
Information System (GIS) software packages.