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Behind The Curtain: Behind The Curtain: GIS and Floodplain MappingGIS and Floodplain Mapping
Adam Daily, Bradford Hartley, & Adam Pooler
GIS Analysts
Stantec Consulting Services Inc.
2008 Ohio GIS Conference
September 10-12, 2008
Crowne Plaza North Hotel
Columbus, Ohio
Introduction to Map BookIntroduction to Map BookGeneratorGenerator
Floodplain Delineation
• Rectify Original Flood
Insurance Rate Map (FIRM)
• Digitize Cross Sections
• Create Water Surface TIN
• Create Ground TIN
• Use Delineator
• Essential fields to have while rectifying
– Transportation
– Orthophotography
• Find General
Area
• Use “Fit to
Display”
Rectify
Rectify (cont.)
• Draw your “Links”
• Fine tune your
rectification
using floodway
structures such as
bridges, dams, and
Culverts.
Digitize Cross Sections & AttributeLettered Cross Sections
Extend Cross Sections
OLD verse NEW
1. Accuracy
2. Time/Automated process
3. Digital
4. Costs
INSERT
PIC
Flood Map DesktopFlood Map Desktop
• Created by PBS&J to streamline the DFIRM creation process
• Available to the general public• Extension to ArcGIS• Versions for 9.3 and ArcSDE enterprise
geodatabase users• www.pbsj.com or email
Flood Map DesktopFlood Map Desktop
• Non-dependant on MXDs• Multi-User Editing of
Graphics (SDE not required)• Organize and control data
and map layout • Advanced tools and options
outside of DFIRM projects
Map Modernization ProgramMap Modernization Program
• Digital seamless & nationwide maps and data layers
• Best available data• Easily accessible data• Fully integrate FEMA’s state
and local partners into the mapping process
Leveraging Map Mod DataLeveraging Map Mod Data
• Incorporate layers into planning processIncorporate layers into planning process– Permitting / Building development– Economic Development Plans– Emergency management planning– Future conditions modeling
• Flood hazard mitigation– Become a member of the NFIP– Assess community needs and update standards– Minimize risk such as repetitive loss structures
• Other uses separate from intended purposes
County StatusCounty Status(updated 09/03/2008)(updated 09/03/2008)
Where can I access the dataWhere can I access the datahttp://msc.fema.govhttp://msc.fema.gov
End of Presentation
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