A Benthic Terrain Classification Scheme for American Samoa

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Figure 10 BPI Zones for Fagatele Bay National Marine Sanctuary. 1. Crests - High points in the terrain where there are positive bathymetric position index values greater than one standard deviation from the mean in the positive direction 2. Depressions - Low points in the terrain where there are negative bathymetric position index values greater than one standard deviation from the mean in the negative direction 3. Flats - Flat points in the terrain where there are near zero bathymetric position index values that are within one standard deviation of the mean. Flats have a slope that is 5 o . Slopes are otherwise called escarpments in the NOAA/NOS classification scheme. 28
Classification Scheme for Structures A surficial characteristic of the seafloor based on a BPI value range at a combined fine scale and broad scale, on slope values and on depth. Figure 11 Structures for Fagatele Bay National Marine Fisheries. 1. Narrow depression - A depression where both fine and broad features within the terrain are lower than their surroundings 2. Local depression on flat - A fine scale depression within a broader flat terrain 3. Lateral midslope depression - fine scale depression that laterally incises a slope 4. Depression on crest - A fine scale depression within a crested terrain 5. Broad depression with an open bottom - A broad scale depression with a U- shape where any nested, fine scale features are flat or have constant slope 29
Page 1 and 2: A Benthic Terrain Classification Sc
Page 3 and 4: Introduction The high productivity
Page 5 and 6: classification may lead to more eff
Page 7 and 8: slopes; upper slopes, mesas; local
Page 9 and 10: or framework, used for a habitat st
Page 11 and 12: well as user and producer accuracy
Page 13 and 14: spear fishing, poison and dynamite
Page 15 and 16: Data Analysis and Processing Bathym
Page 17 and 18: BPI was calculated in the ArcGIS ra
Page 19 and 20: would represent patterns of depress
Page 21 and 22: Rugosity Analysis The rugosity anal
Page 23 and 24: Figure 7 The amount of overlap that
Page 25 and 26: The unique numbers assigned to clas
Page 27: Multiple schemes were reviewed to a
Page 31 and 32: classifications advantageously use
Page 33 and 34: transitional areas (e.g. narrow cre
Page 35 and 36: Conclusion The study was a success
Page 37 and 38: Acknowledgements This research was
Page 39 and 40: Culliton, T. J. 1998. Population: D
Page 41 and 42: NOAA National Centers for Coastal O

A Benthic Terrain Classification Scheme for American Samoa

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