FLOOD09505

• County: Statewide
• Basin: Statewide
• Title: Standards for Digital Flood Insurance Rate Maps
• Date: 10/1/1993
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

Parameter Attribute Codes

Maj or
Code

Minor
Code

Descriotor

421

FIRM Panel
Number

. 4,22

00--

FIRM Panel
Alpha
Character

423 00-- State FIPS
Code
424 Community
Number
425 0- -- Countywide
Map NLlDIber

Comments

Right justified; 4 digits,

This code is used to encode the alpho,betic
portion of the map panel number, The code
substitutes the numeric equivalent 01 to 26
for the letters A to Z, It is right justi-
fied; two digits.

Right justified; 2 digits. See Appendix D
for a complete listing of State FIPS codes,

Right justified; 4 digits, Use for non-
countywide studies.

Right justified; 3 digits, The "C" in the
countywide map nwnber is not included in the
parameter attribute code. Use for countywide
studies.

Notes: An area covered by a community-based FIRM panel should have five
attribute code pairs identifying it. They would be: 420 0150,
421 - - --, 422 0-- -, 423 00--, 424 The codes must be arranged in
this order (see Figures 2 and 3),

An area should be covered by only one FIRM panel. In situations where
multiple Flood Insurance Studies (FISs) are being mapped in digital
format, the FIRM panel neatline code may identify a line that defines
the perimeter of the intersection of the FIRM panel with the politieal
boundary. The Map Panel Areas DLG would thus potentially sho", the
corporate bOLmdary of a community coded with the FIRM panel neatline
attribute code,

In areas where FIS data overlaps, a determination should be made as to
which Frs is most accurate. Typically, it is the more detailed study,
or the most recent. The panel code entered in the area of oVE~rlap
should correspond to the panel number of the study that was u"ed to
determine the flood hazard zone.

If DLGs are prepared for FIRM panels whose neatlines do not correspond
to USGS 7. 5-minute quadrangle neatlines or subdivisions thereof, thE!
FIRM panel neat lines may be the only feature falling on a USG~; 7.5-
minute quadrangle or they may fall in an area where no USGS 7.5-minute
quadrangle exists. For both of these situations (7.S-minute quadrangle
areas that would contain only FIRM panel neatlines) FEMA Map Panel DLG
files will not be prepared, However, because polygon closure is

10/93

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