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