DFIRM PRODUCTION
Successful FEMA Map modernization mapping projects involve careful scoping and planning. Countywide mapping projects can include a combination of:
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Digital conversion
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Digital upgrade
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Re-delineation
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Re-studies (approximate, limited detail, or detailed)
GeoFIRM supports both data importing and construction for every type of DFIRM study.
Digital Conversion
This task requires critical coordination of all effective FIRM data and creation of a new digital FIRM with a DFIRM database. GeoFIRM tools are optimized to capture effective information, like profiles and floodway data tables (FDTs). This data is stored in the geodatabase and then spatially referenced within ArcGIS. Datum conversions and new Base Flood Elevations (BFEs) are then captured and displayed on the new DFIRM. The study’s DFIRM database is easily produced with a click of a button.
Digital Upgrade
Digital upgrades are valuable when the current digital FIRM does not meet current basemap standards and specifications or when a DFIRM database is needed. Because GeoFIRM is standards-based and open-architecture, it can easily incorporate existing digital FIRM data. GeoFIRM easily incorporates existing spatial and non-spatial datasets in all types of formats – even CADD files and hardcopy data.
Re-delineation
Re-delineation is performed using technology and automation to:
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Extract model data
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Vectorize effective data
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Remap FP on new topo
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Create DFIRM databases with GIS
GeoFIRM includes industry-leading floodplain mapping tools that produce FEMA-compliant floodplain mapping. GeoFIRM easily incorporates modeling results from standard hydraulic models. This data is then spatially referenced and remapped on the new topo base.
Re-studies
Re-studies may consist of a combination of areas needing:
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Detailed study
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Limited detail study
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Approximate study
GeoFIRM offers tools that help map the results. GeoFIRM floodplain mapping tools automate delineation of floodplains and floodways in compliance with FEMA requirements (e.g., automatically superimposes backwater effects, automates BFE and floodway plotting, cross section annotation, applies datum conversion, etc). These tools also overcome limitations of some of the "off-the-shelf" floodplain mapping utilities. For example, many hydraulic tools such as GeoRAS do not map ineffective flow areas, produce 'jagged' floodplain delineations, and map isolated small areas of high ground as 'islands' outside of the floodplain. Through GeoFIRM’s floodplain mapping tools, the user is able to utilize GIS-based engineering and mapping techniques that can be integrated directly into DFIRMs.
