The Benthic Terrain Modeler for Terrain Classification and

The Benthic Terrain Modeler for Terrain Classification and Visualization of American Samoa Multibeam Data Dept. of Geosciences – Oregon State University Ron Rinehart Dr. Dawn Wright Emily Lundblad Emily Larkin NOAA - Coastal Services Center Josh Murphy Lori Cary-Kothera

What is the BTM? • BTM = Benthic Terrain Modeler • Standalone program compatible with Arc. GIS 8. x • Converts bathymetry into a user defined classification system • Combination of spatial analysis algorithms 2

Key Questions about the BTM Tool? What is it? How does one use the BTM tool? What are the key features? What are the computer system requirements? Why is this tool needed? Who will use it? Where will this tool be used? Is it a useful tool? When will it be available? 3

Which Spatial Analysis Algorithms? Slope Multi-Scale Bathymetric Position Index Rugosity 4

Bathymetric Position Index – How it Works Hilltop Middle Valley Coarse BPI Ridge Crest Fine BPI Stream Channel 5

Bathymetric Position Index Sloped Surface Composite BPI Slope Stream Valley on a Sloping Hillside 6

Rugosity 7

How does it work? Step One Step Two Slope Bathymetry + Fine BPI Step Four Step Three Biodiversity Enhanced Benthic Zones? Composite BPI + + Coarse BPI Rugosity (derived from bathymetry) 8

How does one use the BTM tool? 9

How does one use the BTM tool? 10

BTM Key Features? • Wizard Interface • ‘Learn More’ Buttons • Re-use intermediate results • Re-sampler built in to save time • Classification Dictionary • Dictionary files are XML • Skip the Wizard – Go Straight to the Desired Process 11

Computer System Requirements? • Arc. GIS 8. x with Spatial Analyst • Fast processor >2. 0 Ghz recommended • Up to a gigabyte of hard drive space • Rasters need to be ESRI GRID format : : These are guidelines. As raster size increases so does processing time: : 12

Why is this tool needed? 13 Images Courtesy of NOAA – Wave of the Future Calendar

Who will use the BTM? User Fagatele Bay National Marine Sanctuary American Samoa Department of Marine and Wildlife Resources American Samoa Community College Oregon State University Purpose Management Education Research 14

Example from Vatia Bay 15

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Bathymetry of Vatia Bay 17

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BPI of Vatia Bay Coarse BPI Fine BPI 19

Benthic Terrain Classes of Vatia Bay 20

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Profile Analysis Forereef Reef Crest Shelf Reef Crest Forereef Shelf 22 Image Courtesy of NOAA Biogeography

Benthic Terrain of Vatia Bay 23

Rugosity of Vatia Bay 24

Rugosity of Vatia Bay 25

Is it Useful? Data need to be ‘ground-truthed’ Mission scheduled for 2005 Potential for including Aspect Potential for Backscatter 26

When and where will it be available? When: October 2004 Where: http: //dusk. geo. orst. edu/djl/samoa Mirror at NOAA CSC 27

Thanks & Acknowledgements NOAA Coastal Services Center Integration and Development Initiative, Grant #NA 03 NOS 4730014 Oregon State University Mc. Nair Scholars Programming Team from NOAA CSC Jeff Jenness & Andy Weiss Pat Iampietro and Rikk Kvitek 28

When and where will it be available? When: October 2004 Where: http: //dusk. geo. orst. edu/djl/samoa Mirror at NOAA CSC 29