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FEMA Region III Storm Surge Project: Digital Elevation Model Enhancements (2009)

The FEMA Region III Storm Surge Project focuses on advancing the Digital Elevation Model (DEM) for improved flood risk assessment. Led by experts from RENCI, NAP, NAO, and ARCADIS, the team evaluated over 125 datasets, totaling approximately 2 TB, consisting of various data types including TIFF, CSV, and LAS. Key efforts encompassed spatial adjustments, data gathering, and quality assurance, ensuring accurate representation across NJ, DE, MD, and VA. Significant methodologies such as 10m resolution interpolation using advanced algorithms were employed. The project provides critical insights for future storm surge modeling and disaster preparedness.

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FEMA Region III Storm Surge Project: Digital Elevation Model Enhancements (2009)

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  1. FEMA Region III Storm Surge Project Digital Elevation Model (DEM) Team Members Lisa Stillwell (RENCI) – “many hats” archival/clipping,meeting Margaret Blanchard (RENCI) -data archival/spatial adjustments Jason Miller (NAP) District lead – data gathering C. Rourke (NAP) Mark Hudgins (NAO) Paul Moye (NAO) Jared Scott (NAB) Micah Callough (ARCADIS) – spatial adjusments/processing Rob Floyd (ARCADIS) – spatial adjusments/processing Peter Estes (ARCADIS) – spatial adjusments/processing Michael Forte Region III DEM Team USACE-FRF June 4, 2009 RENCI, Chapel Hill, NC

  2. Data Collection • Over 125 datasets evaluated (~2 TB) • Data types: • TIFF • CSV • ASCII GRID • Raster • FLT • LAS • Shapefile • SID • and more… • Projections: • NJ, DE, MD, VA State Plane • UTM • Datums: • NAD27 • NAD83 • Tidal (MSL, MLLW, etc.)

  3. Conversion Horizontal Conversion Geographic Coordinates Decimal Degrees (NAD83) Elevation/depth relative to North American Vertical Datum 1988 (NAVD88) meters

  4. Conversion Vertical Datum Conversion V – Datum (NOAA) Unit Conversion Mean Lower Low water MLLW North American Vertical Datum of 1988 NAVD 88 m

  5. Datums…Datums…units…units…. Conversion From Various Horizontal &Vertical Datums North American Datum 1983 Geographic Decimal Degrees (NAD83) Elevation/depth relative to North American Vertical Datum 1988 (NAVD88) meters

  6. Many Point and Grid Datasets With Varying Resolution Are Interpolated to 10m resolution

  7. FEMA Region 3 Divided Into 20 Tiles For Efficient Data Management Certain Tiles Contain Up To 6 Gigabytes Of Data.

  8. IVS 3-D Fledermaus Interpolation Parameters Weighted Moving Average Algorithm Search weight – average value of 3-5 used Grid Cell Size - 0.00011degrees ~10m cell size Iterative process obtaining best result given data density and Quality Ex. Search Weight

  9. Tile 2 Lidar Dataset Obvious Offset

  10. Tile 4 offset (Ocean City NJ Area) Thorough Visual inspection identifies anomalies Error in lidar information (fixed with updated Cape May Lidar)

  11. Tile 4 Inlet Issue

  12. Lidar Datasets Need Clipping Around land/water interface Profile displays jump of 2.5m

  13. Tile 4 0m Contour QA/QC plotted in Google Earth

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