1 / 22

FEMA Region III Storm Surge Project

FEMA Region III Storm Surge Project. Construction of The Digital Elevation Model The Foundation of a Storm Surge Model FEMA Region III Coastal Storm Surge Project Workshop November 1 2011 Michael F. Forte, Lisa Stillwell, Jason F. Miller, Jeffrey L. Hanson. FEMA Region III Domain.

akira
Download Presentation

FEMA Region III Storm Surge Project

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. FEMA Region III Storm Surge Project Construction of The Digital Elevation Model The Foundation of a Storm Surge Model FEMA Region III Coastal Storm Surge Project Workshop November 1 2011 Michael F. Forte, Lisa Stillwell, Jason F. Miller, Jeffrey L. Hanson

  2. FEMA Region III Domain 6 States Pennsylvania Delaware Maryland Virginia North Carolina New Jersey Chesapeake and Delaware Bays, Numerous Rivers & Atlantic Seaboard

  3. Data Gathering USACE District offices of Philadelphia, Baltimore, and Norfolk played critical role in obtaining the most accurate up-to-date datasets for Region • Over 125 data sets 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.)

  4. Data Sources • US Army Corps of Engineers • USGS • NOAA / NGDC • NC Division of Emergency Management Flood Plain Mapping Program (NCDEM – FMP) • Individual States

  5. Topographic LiDARCoverage 24 LiDARData sets National Elevation Dataset (NED) covered remaining areas

  6. Bathymetric Data Coverage

  7. SHOWEX Bathymetric Data Set“SHOaling Waves Experiment”

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

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

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

  11. 10m Resolution Interpolation 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

  12. QA/QC Result after interpolation Obvious errors literally “jump out”

  13. USACE Districts DEM Review

  14. USACE Districts DEM Review Cross section from tile 8 reveals anomaly Coordinates are defined for peak and Investigated using Google earth.

  15. USACE Districts DEM Review 8NS5 – Google earth search revealed some square areas that may contain higher elevations (possible mining activities).

  16. ARCADIS DEM Review Tile 3 DEM Reveals Barrier Island not present in Aerial Photograph

  17. Tile 3 Bridge serves as impediment to water flow Bridge Removal

  18. Bridge Removal Tile 3 Delaware River Bridge Impediment Fledermaus conversion to “PFM” and bridge is manually removed

  19. Bridge Removal Tile 3 Re-interpolated with bridge removed

  20. Land Water Interface Lidar Datasets Need Clipping Around land/water interface Profile displays jump of 2.5m

  21. High Quality DEM for Mid-Atlantic • Most Complete up to date seamless DEM available for Mid-Atlantic Region • Comprised of 120 Datasets (~2TB) • Serves a variety of purposes from modeling to sea level rise studies

  22. Documentation /Submittal 1.1 • Documents DEM data, procedures, and USACE District Review • Published as U.S. Army Corps of Engineers ERDC-CHL Technical Report • Available at: • dodreports.com/pdf/ada539477.pdf

More Related