Schedule - Day 1, Mon
• 8:30-9:30 - Dawn - Intro • 9:30-10:00 – Break - Technical Setup• 10:00-12:00 – Emily/Dawn - Module 1:
Exploring the Reefs– all modules include intro lecture, then
hands-on work
• 12:00-1:00 – Lunch• 1:30-2:30 – Dawn – Seafloor mapping
techniques and GIS analysis• 2:30-4:30 – Emily/Dawn – Module 2:
Benthic Classifications
http://dusk.geo.orst.edu/djl/samoahttp://dusk.geo.orst.edu/djl/samoa/ascc
Dawn WrightDepartment of Geosciences
Oregon State University
GIS Terrain Analysis
ASCC GIS Workshop, September, 2004Photo by
NOAA Biogeography“Benthic Habitat” from
Ikonos
By OrSt grad student Emily Lundblad
Fagatele Bay National Marine Sanctuary, 2001 bathy
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
BottomCoarse BPI
Middle
Ridge Crest
Lava ChannelFine BPI
BPI Zone and
Structure
Classification
Flowchart
Emily Lundblad, OrSt M.S. Thesis
Emily Lundblad, OrSt M.S. Thesis
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.
Terrain Analysis:Rugosity
• Measure of how rough or bumpy a surface is, how convoluted and complex• Ratio of surface area to planar area
Graphics courtesy of Jeff Jenness, Jenness Enterprises, and Pat Iampietro, CSU-MB
Surface area based onelevations of 8 neighbors
3D view of grid on the left Center pts of 9 cells connectedTo make 8 triangles
Portions of 8 triangles overlapping center cellused for surface area
Emily Lundblad, OrSt M.S. Thesis
http://dusk.geo.orst.edu/djl/samoahttp://dusk.geo.orst.edu/djl/samoa/ascc