office for information resources gis services flood map modernization and the tennessee base mapping...
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Office for Information Resources
GIS Services
Flood Map Flood Map Modernization and Modernization and the Tennessee Base the Tennessee Base Mapping ProgramMapping Program
Flood Map Flood Map Modernization and Modernization and the Tennessee Base the Tennessee Base Mapping ProgramMapping Program
Dennis Pedersen, Director F&A, OIR – GIS Services
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Tennessee Base Mapping Program
• What is the DFIRM Product?• Components of DFIRM Product• Tennessee Base Map Source Data• Tennessee Base Map Topography
Source Data• GIS Data Sources• Benefits of DFIRM Product• Demonstration
Presentation OverviewPresentation OverviewPresentation OverviewPresentation Overview
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Tennessee Base Mapping Program
What is the DFIRM What is the DFIRM Product?Product?
• Official basis for implementing the regulations and requirements of the National Flood Insurance Program (NFIP)
• A digital database that encompasses several features or layers of spatial information
• DFIRM database includes:– Flood hazards areas
• 1% annual chance flood (100-year flood), known as the base flood
• Areas of 0.2% annual chance flood
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Tennessee Base Mapping Program
What is the DFIRM What is the DFIRM Product? (cont.)Product? (cont.)
– Base (1% annual chance) Flood Elevation (BFE) lines with mapped cross section lines
– Structures (dams, bridges, culverts, levees etc.)
– Hydrographic features (streams, lakes, shorelines)
– Transportation features with labels– Political areas (corporate and county
boundaries, National Parks, forests, and military lands)
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Tennessee Base Mapping Program
What is the DFIRM What is the DFIRM Product? (cont.)Product? (cont.)
– Permanent benchmarks with National Geodetic Survey (NGS) Permanent Identifier
– FIRM panel areas with effective date, size, scale, and corner coordinates
– USGS 7.5-minute quadrangle areas– Required to meet FEMA standards and
specifications• Subject to community review and
approval
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Tennessee Base Mapping Program
Components of DFIRMComponents of DFIRM
DFIRM=
Flood DataBase + Topography +
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Tennessee Base Mapping Program
• Vision Statement: Create a statewide GIS base map through partnership development that can be used in support of a wide range of local, state, and federal programs
Base Mapping Program Base Mapping Program Base Mapping Program Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
Tennessee Base Map Tennessee Base Map Source DataSource Data
• Parcels and related features– Parcel boundaries– Parcel annotations– Other cadastral features
• Planimetrics - Edge-of-pavement (EOP)- Hydrology
- Streams- Lakes, rivers, and shorelines
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Tennessee Base Mapping Program
Tennessee Base MapTennessee Base MapSource Data Source Data (cont.)(cont.)
•Street centerlines•Administrative boundaries
–County and city
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Tennessee Base Mapping Program
Tennessee Base Map Tennessee Base Map Topography Source DataTopography Source Data• Two different DTM products: standard and
high accuracy (HA)• Standard DTM vs. High Accuracy DTM
–Standard produces the orthophoto–HA produce 10’ contours for 400’ scale
and 2’ contours for 100’ scale• FEMA subcontractors use DTMs to produce
contours• Modify DFIRM for more accurate depiction
of floodway boundaries
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Tennessee Base Mapping Program
TNBMP – Digital Terrain ModelTNBMP – Digital Terrain Model
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
Other DFIRM Data Other DFIRM Data SourcesSources
•Local Government– Utilities– Planning – Engineering– GIS departments
•Tennessee Department of Transportation
•Tennessee Valley Authority (TVA) & Corps of Engineers
– Flood Studies– Contours– Anecdotal Information– Structure Elevations
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Tennessee Base Mapping Program
Benefits of DFIRM Benefits of DFIRM ProductProduct
• Increase quality, reliability, and availability of flood data and flood hazard maps
• Provide timely flood hazard information • Enhance ability to manage risks and
issues locally• Provides a comprehensive approach to
economic development, mitigation planning, and emergency response
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Tennessee Base Mapping Program
Benefits of DFIRM Product Benefits of DFIRM Product (cont.)(cont.)• Provide detailed information for builders
and developers for making decisions• Flood risks and Flood hazards are
demonstrated more efficiently for local officials and community planners
• Provide insurance agents, companies, and lending institutions updated flood map information resulting in fair and equitable insurance rates
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Tennessee Base Mapping Program
• How can State agencies create and maintain spatial data once and use (share) it many times?
The “Tennessee Map” (TNMap)
Enterprise GIS DevelopmentEnterprise GIS Development
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Tennessee Base Mapping Program
• Goals– Develop enterprise GIS infrastructure to provide
secure, usable, and easy access to TNBMP data– Provide State agencies with ability to publish data
to enterprise GIS– Support vision of USGS’ National Map and NSDI– Identify data stewards, reduce or eliminate
redundant GIS data collection
The Tennessee Map (TNMap): The Tennessee Map (TNMap): Enterprise GIS ArchitectureEnterprise GIS Architecture
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Tennessee Base Mapping Program
• Geo-portal application• Base Map Data Repository• Shared GIS infrastructure for application
hosting• Access: Public, State GIS users
TNMap…More than just a map
The Tennessee Map (TNMap): The Tennessee Map (TNMap): Enterprise GIS ArchitectureEnterprise GIS Architecture
TNMap portal demonstration…
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Tennessee Base Mapping Program
GIS Data WorkflowGIS Data Workflow
Custom GIS Data=
GIS AnalysisBase Map
Data + Tabular +
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Tennessee Base Mapping Program
State GIS Data State GIS Data
Hazmat / Schools / Hospital locations
Environmental / Conservation features
City / County / Admin. Boundaries (OIR GIS)
Streets / Rivers / Land Features (OIR GIS)
Property Boundaries (OIR GIS)
Imagery / Elevation (OIR GIS)
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
OIR-GIS/TDOT - PartnershipOIR-GIS/TDOT - Partnership
• TDOT Modernizing Equipment– Digital camera suitable for ortho photo production– Training staff on new photogrammetry production req.– ortho acquisition for ¼ of State annually
• 2008 Acquisition: Region 4 (West TN)
• OIR-GIS responsible for data hosting and distribution– TNMap enterprise GIS– Dissemination to local government
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Tennessee Base Mapping Program
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Tennessee Base Mapping Program
– FEMA Map Service Center:• https://msc.fema.gov/
– FEMA Mapping Information Platform:• https://hazards.fema.gov/
– Administrative Questions:• Stan Harrison, Reg. Director, ECD Local
Planning 423-434-6476
FEMA Flood Map FEMA Flood Map Modernization:Modernization:On-line and other ResourcesOn-line and other Resources
FEMA Flood Map FEMA Flood Map Modernization:Modernization:On-line and other ResourcesOn-line and other Resources
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Tennessee Base Mapping Program
Thank you….Thank you….Thank you….Thank you….
• Contact Information:– Dennis Pedersen, Director, GIS
Services312 8th Avenue North16th Floor, WRS Tennessee TowerNashville, TN 37243-0288
– E-mail: dennis.pedersen@state.tn.us– Phone: 615-741-9356
http://tnmap.state.tn.us/portal
http://tnmap.state.tn.us/portal
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