1 / 14

FEMA Region III Storm Surge Project

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)

oihane
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 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

More Related