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    • Bathymetric Position Index (BPI) Zones Grid Derived from Gridded Bathymetry for Select U.S. Coral Reef Locations across the Pacific Ocean

    Metadata Updated: March 16, 2024

    Bathymetric Position Index (BPI) Zones 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 4 classes (crest, depression, flat, slope) 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 Zone 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.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date February 29, 2024
    Metadata Created Date November 12, 2020
    Metadata Updated Date March 16, 2024
    Reference Date(s) 2018 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from NMFS PIFSC

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date February 29, 2024
    Metadata Created Date November 12, 2020
    Metadata Updated Date March 16, 2024
    Reference Date(s) 2018 (publication)
    Responsible Party (Point of Contact, Custodian)
    Contact Email
    Guid gov.noaa.nmfs.inport:12616
    Access Constraints Cite As: Pacific Islands Fisheries Science Center, [Date of Access]: Bathymetric Position Index (BPI) Zones Grid Derived from Gridded Bathymetry for Select U.S. Coral Reef Locations across the Pacific Ocean [Data Date Range], https://www.fisheries.noaa.gov/inport/item/12616., Access Constraints: None, Use Constraints: These data are not to be used for navigation purposes. Please cite PIFSC Ecosystem Sciences Division (ESD) when using the data. Suggested citation: Ecosystem Sciences Division; Pacific Islands Fisheries Science Center (2018). Bathymetric Position Index (BPI) Zones Grid Derived from Gridded Bathymetry for Select U.S. Coral Reef Locations across the Pacific Ocean. Pacific Islands Benthic Habitat Mapping Center, https://www.fisheries.noaa.gov/inport/item/12616. [access date], Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
    Bbox East Long -166.11682
    Bbox North Lat 28.453633
    Bbox South Lat 23.62792
    Bbox West Long -178.378433
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id d9b9cb4e-bb5f-4a4b-9064-463f890a9e2b
    Harvest Source Id c0beac72-5f43-4455-8c33-1b345fbc2dfe
    Harvest Source Title NMFS PIFSC
    Licence NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose.
    Lineage 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)
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-178.378433, 23.62792], [-166.11682, 23.62792], [-166.11682, 28.453633], [-178.378433, 28.453633], [-178.378433, 23.62792]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2000
    Temporal Extent End 2001

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