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Flood Map Modernization and the Tennessee Base Mapping Program

Flood Map Modernization and the Tennessee Base Mapping Program. Dennis Pedersen, Director F&A, OIR – GIS Services. Presentation Overview. What is the DFIRM Product? Components of DFIRM Product Tennessee Base Map Source Data Tennessee Base Map Topography Source Data GIS Data Sources

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Flood Map Modernization and the Tennessee Base Mapping Program

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  1. Flood Map Modernization and the Tennessee Base Mapping Program Dennis Pedersen, Director F&A, OIR – GIS Services

  2. Presentation Overview • 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

  3. What is the DFIRM 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

  4. What is the DFIRM 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)

  5. What is the DFIRM 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

  6. Base Topography Flood Data + + = DFIRM Components of DFIRM

  7. 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

  8. Tennessee Base Map Source Data • Parcels and related features • Parcel boundaries • Parcel annotations • Other cadastral features • Planimetrics • Edge-of-pavement (EOP) • Hydrology • Streams • Lakes, rivers, and shorelines

  9. Tennessee Base MapSource Data (cont.) • Street centerlines • Administrative boundaries • County and city

  10. Tennessee Base Map Topography 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

  11. TNBMP – Digital Terrain Model

  12. Other DFIRM Data Sources • 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

  13. Benefits of DFIRM Product • 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

  14. Benefits of DFIRM Product (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

  15. Enterprise GIS Development • How can State agencies create and maintain spatial data once and use (share) it many times? • The “Tennessee Map” (TNMap)

  16. The Tennessee Map (TNMap): Enterprise GIS Architecture • 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

  17. The Tennessee Map (TNMap): Enterprise GIS Architecture TNMap…More than just a map • Geo-portal application • Base Map Data Repository • Shared GIS infrastructure for application hosting • Access: Public, State GIS users TNMap portal demonstration…

  18. Tabular GIS Analysis + GIS Data Workflow Base Map Data + = Custom GIS Data

  19. 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)

  20. OIR-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 • OIR-GISresponsiblefordata hosting and distribution • TNMap enterprise GIS • Dissemination to local government • 2008 Acquisition: Region 4 (West TN)

  21. FEMA Flood Map Modernization:On-line and other Resources • 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

  22. 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

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