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General Information

File Identifier:	gov.noaa.nmfs.inport:12617
Metadata Date Stamp:	2020-04
Organization:	Pacific Islands Fisheries Science Center
Organization Role:	resourceProvider

Identification Information

Title:	Bathymetric Position Index (BPI) Structures Grid Derived from Gridded Bathymetry for Select U.S. Coral Reef Locations across the Pacific Ocean
Dataset Language:	eng; US
Abstract:	Bathymetric Position Index (BPI) Structures are derived for islands and banks across the U.S. Pacific Islands Region from a focal mean analysis on bathymetry and slope, and were created using the Benthic Terrain Modeler. Cell values represent one of 13 classes in an index of seafloor terrains. The grids are based primarily on gridded multibeam bathymetry collected aboard NOAA Ships Hi'ialakai and Oscar Elton Sette and aboard R/V AHI (Acoustic Habitat Investigator) from 2003 to 2012 by the PIFSC Ecosystem Sciences Division (ESD). Other sources of available data used to derive BPI Zones for a few locations include estimated depths derived from IKONOS satellite imagery from 2000 to 2002, LIDAR data from 2001 and 2007, and multibeam bathymetry collected in 2001 and 2002. The BPI Structure grid generated for each location is available via the Pacific Islands Benthic Habitat Mapping Center (PIBHMC) website. The data, maps, layer files, and detailed documentation (more specific than this pacific-wide record) about the data sources and data processing steps used are included in the zip file for each location.

Data Theme

Theme Topics:

Elevation and Derived Products

Spatial Domain

West Bounding Longitude:	-156.100504
South Bounding Latitude:	19.772429
East Bounding Longitude:	-155.822838
North Bounding Latitude:	20.061727

Data Quality Information

Scope (quality information applies to):

Dataset

Data History:

The method to develop the BPI data layers are generally described in the Benthic Habitat Mapping "Overview" section of the Pacific Islands Benthic Habitat Mapping Center website. The data are generated in ArcGIS using Spatial Analyst and the Benthic Terrain Modeler (BTM). Bathymetric Position Index (BPI) is a second order derivative of bathymetry. The derivation evaluates elevation differences between a focal point and the mean elevation of the surrounding cells within a user defined annulus or circle. A negative value represents a cell that is lower than its neighboring cells (depressions) and a positive value represents a cell that is higher than its neighboring cells (crests). Larger numbers represent more prominent features on the seafloor, which differ greatly from surrounding areas. Flat areas or areas with a constant slope produce near-zero values. (Lundblad et al. 2006)

Contact Information

Address:	1845 Wasp Blvd.
City:	Honolulu
State:	HI
Postal Code:	96818
Email:	annette.desrochers@noaa.gov
Telephone:	(808)725-5461

Distribution Information

Format Name:	Zip
Distribution Link:	ftp://ftp.soest.hawaii.edu/pibhmc/website/data/mhi/benthichabitatlayers/WestHawaii_BPIstructures.zip
Distribution Link Function:	Download

Metadata Reference Information

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