Dept. of Geosciences – Oregon State UniversityRon Rinehart

Dr. Dawn WrightEmily Lundblad

Emily Larkin

NOAA - Coastal Services CenterJosh Murphy

Lori Cary-Kothera

The Benthic Terrain Modeler for Terrain Classification and

Visualization of American Samoa Multibeam Data

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What is the BTM?

• BTM = Benthic Terrain Modeler

• Standalone program compatible with

ArcGIS 8.x

• Converts bathymetry into a user

defined

classification system

• Combination of spatial analysis

algorithms

3

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?

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Which Spatial Analysis Algorithms?

Slope

Multi-Scale Bathymetric Position Index

Rugosity

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Bathymetric Position Index – How it Works

Hilltop

ValleyCoarse BPI

Ridge Crest

Stream Channel

Middle

Fine BPI

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Bathymetric Position Index

SlopeSloped Surface

Composite BPI

Stream Valley on aSloping Hillside

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Rugosity

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How does it work?

Fine BPI+

+

+

Coarse BPI

Slope

Rugosity(derived

frombathymetr

y)

Step One Step Two Step Three Step Four

Bathymetry

BiodiversityEnhanced

Benthic Zones?

Composite BPI

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How does one use the BTM tool?

10

How does one use the BTM tool?

11

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

12

Computer System Requirements?

• ArcGIS 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::

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Why is this tool needed?

Images Courtesy of NOAA – Wave of the Future Calendar

14

Who will use the BTM?

User PurposeFagatele Bay

National Marine Sanctuary

Management

American Samoa Department of

Marine and Wildlife Resources

Management

American Samoa Community College

Education

Oregon State University

Research

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Example from Vatia Bay

16

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Bathymetry of Vatia Bay

18

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BPI of Vatia Bay

Coarse BPI Fine BPI

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Benthic Terrain Classes of Vatia Bay

21

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Profile Analysis

Image Courtesy of NOAA Biogeography

Reef Cres

tForere

ef

Shelf

Reef Cres

t

Shelf

Forereef

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Benthic Terrain of Vatia Bay

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Rugosity of Vatia Bay

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Rugosity of Vatia Bay

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Is it Useful?

Data need to be ‘ground-truthed’

Mission scheduled for 2005

Potential for including Aspect

Potential for Backscatter

27

When and where will it be available?

When: October 2004

Where:

http://dusk.geo.orst.edu/

djl/samoa

Mirror at NOAA CSC

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Thanks & Acknowledgements

NOAA Coastal Services Center Integration

and Development Initiative, Grant

#NA03NOS4730014

Oregon State University McNair Scholars

Program

Programming Team from NOAA CSC

Jeff Jenness & Andy Weiss

Pat Iampietro and Rikk Kvitek

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When and where will it be available?

When: October 2004

Where:

http://dusk.geo.orst.edu/

djl/samoa

Mirror at NOAA CSC