html5-img
1 / 67

Dawn Wright Department of Geosciences Oregon State University

Seafloor Mapping & GIS for the Fagatele Bay National Marine Sanctuary. Dawn Wright Department of Geosciences Oregon State University. Photo by. ASCC GIS Workshop, September, 2004. Bottom Coverage & Data Density by Survey Method. Leadline. Single Beam. Multibeam. 1-2 K soundings

gaul
Télécharger la présentation

Dawn Wright Department of Geosciences Oregon State University

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. Seafloor Mapping & GIS for theFagatele Bay National Marine Sanctuary Dawn Wright Department of Geosciences Oregon State University Photo by ASCC GIS Workshop, September, 2004

  2. Bottom Coverage & Data Density by Survey Method Leadline Single Beam Multibeam 1-2 K soundings per survey 500 - 750 K soundings per survey 400,000 – 1,000,000 K soundings per survey Image courtesy of NOAA & UNH

  3. Active Remote SensingAcoustic! • multiple, focused, high-frequency, short wavelength sound beams • “narrow-beam” or “multibeam” bathymetry • sound beam stays narrow and focused all the way to the bottom • depths much more precise • e.g., Sea Beam has 16 beams, Sea Beam 2000 has 121, EM3000 has 127, EM120 has 191

  4. Mapping the Ocean Floor • Only 5% of global ocean floor charted in high rez with ships - we need 125 more years! Image courtesy of NOAA

  5. Ocean Thematic Layers Graphic courtesy of Christina Massel, Steve Miller, Scripps

  6. Multibeam Bathymetry A Gigabyte of data an hour A Gigabyte of data a day

  7. The World Ocean Floor

  8. N

  9. Fine-Scale Mapping • on the order of tens of meters to meters • features the size of a beer can!

  10. National Marine Sanctuaries Map courtesy of NOAA National Marine Sanctuary System

  11. U.S. Coral Reef Task Force Seeks to characterize priority reef systems deeper than 30 m in the U.S. and Trust Territories by 2009. Surveys contribute to management of marine protected areas and the possible designation of more protected areas. Evans et al. 2002;http://www.nodc.noaa.gov/col/projects/coral/Coralhome.html

  12. OrSt & USFMultibeam Surveys to date By OrSt grad student Emily Lundblad

  13. Shallow Multibeam(May 2001, November 2002) • Kongsberg-Simrad EM-3000 • Fans out 121 beams at 130 deg. • Swaths 3-4 times water depth • Depths in 3-150 m range at survey speeds of 3-12 knots • cm-resolution w/ dGPS

  14. Preparations

  15. Shallow Water Multibeam

  16. Measured offsets required for accurate pitch, roll, yaw

  17. "curling up" of outermost beams"loss of bottom" on very steep slopessudden heading changes

  18. By OrSt grad student Emily Larkin

  19. BPI Zone and Structure Classification Flowchart Emily Lundblad, OrSt M.S. Thesis

  20. Fagatele Bay National Marine Sanctuary, 2001 bathy

  21. SCUBA / Rebreather Technology Images courtesy of Kip Evans, Nat. Geographic and Rich Pyle, Bishop Museum

  22. Rebreather Dive Mission, FBNMS, 2001

  23. NOAA Biogeography“Benthic Habitat” from Ikonos By OrSt grad student Emily Lundblad

  24. Fagatele Bay National Marine Sanctuary, 2001 bathy

  25. Terrain Analysis:Bathymetric Position Index(from TPI, Jones et al., 2000, Weiss, 2001) Measure of where a point is in the overall land- or “seascape” Compares elevation of cell to mean elevation of neighborhood Hilltop Middle Coarse BPI Bottom Ridge Crest Fine BPI Lava Channel

  26. Emily Lundblad, OrSt M.S. Thesis

  27. From Greene, Bizarro et al., in press, 2004, The benefits and pitfalls of GIS in marine benthic habitat mapping, in Wright, D.J. and Scholz, D.J. (eds.), Place Matters: Geospatial Tools for Marine Science, Conservation, and Management in the Pacific Northwest, Corvallis, OR: Oregon State University Press.

  28. Terrain Analysis:Rugosity • Measure of how rough or bumpy a surface is, how convoluted and complex • Ratio of surface area to planar area Surface area based on elevations of 8 neighbors 3D view of grid on the left Center pts of 9 cells connected To make 8 triangles Portions of 8 triangles overlapping center cell used for surface area Graphics courtesy of Jeff Jenness, Jenness Enterprises, and Pat Iampietro, CSU-MB

  29. Emily Lundblad, OrSt M.S. Thesis

  30. NOAA Biogeography“Benthic Habitat” from Ikonos By OrSt grad student Emily Lundblad

  31. Benthic Terrain ModelerBenthic Zone Classification and HabitatArcGIS 8.x

  32. dusk.geo.orst.edu/djl/samoadusk.geo.orst.edu/djl/links.html Image courtesy of FBNMS

  33. http://dusk.geo.orst.edu/djl/samoa

  34. “Sidescan Sonar” • “aerial photograph” of seafloor • backscatter strength in addition to traveltime for bathymetry

  35. Backscatter Image courtesy of USGS Woods Hole

More Related