Bathymetric Position Index (BPI) Structures 5 m grid derived from gridded bathymetry of Galvez Bank, South Galvez Bank, and 11-Mile Reef, Territory of Guam, USA.

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Frequently anticipated questions:


What does this data set describe?

Title:
Bathymetric Position Index (BPI) Structures 5 m grid derived from gridded bathymetry of Galvez Bank, South Galvez Bank, and 11-Mile Reef, Territory of Guam, USA.
Abstract:
BPI Structures are derived from two scales of a focal mean analysis on bathymetry and slope. The grid is based on gridded (5 m cell size) multibeam bathymetry, collected aboard NOAA Ship Oscar Elton Sette. BPI Structures was created using the Benthic Terrain Modeler (https://coast.noaa.gov/digitalcoast//tools/btm/). The Cell values represent one of 12 classes in an index of seafloor terrains. This data set is for Galvez Bank, South Galvez Bank, and 11-Mile Reef, Territory of Guam, USA.
Supplemental_Information:
Gridded bathymetry data were collected aboard the NOAA Ship Oscar Elton Sette, a 224' (68 m) United States National Oceanographic and Atmospheric Administration research ship. The NOAA Ship Sette's survey sensors included a 240-kHz pole-mounted Reson 8101ER sonar, which provides bathymetry and imagery data, a TSS/Applanix POS/MV Model 320, which measures position,velocity, attitude and heading, and a Seabird SBE19 CTD used to measure sound velocity profiles. The metadata for the bathymetry is documented in this product metadata: ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/bathymetry/3Banks_Guam_5m.txt

Specific equipment configurations are documented in metadata from cruise SE1002. These metadata can be accessed at: http://www.soest.hawaii.edu/pibhmc/cms/cruise-catalog/

References: Lundblad et al., 2006, A benthic terrain classification scheme for American Samoa, Marine Geodesy, 29(2):89 - 111. https://coast.noaa.gov/digitalcoast//tools/btm/

Spatial_Data_Organization_Information Direct_Spatial_Reference_Method Raster Raster_Object_Information gal_bpis Raster_Object_Type Grid Cell Row_Count 1869 Column_Count 1623 Vertical_Count 1 Spatial_Data_Organization_Information Direct_Spatial_Reference_Method Raster Raster_Object_Information sgal_bpis Raster_Object_Type Grid Cell Row_Count 905 Column_Count 1293 Vertical_Count 1 Spatial_Data_Organization_Information Direct_Spatial_Reference_Method Raster Raster_Object_Information ele_bpis Raster_Object_Type Grid Cell Row_Count 357 Column_Count 307 Vertical_Count 1

  1. How might this data set be cited?
    Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), 20121130, Bathymetric Position Index (BPI) Structures 5 m grid derived from gridded bathymetry of Galvez Bank, South Galvez Bank, and 11-Mile Reef, Territory of Guam, USA..

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: 144.391
    East_Bounding_Coordinate: 144.500
    North_Bounding_Coordinate: 13.233
    South_Bounding_Coordinate: 12.983
  3. What does it look like?
    http://www.soest.hawaii.edu/pibhmc/CNMI_images/GAL_5m_bpistructures_440.jpg (JPEG)
    Gridded Bathymetry Derivative
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 11-Feb-2010
    Ending_Date: 14-Mar-2010
    Currentness_Reference: ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 55
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: .9996
      Longitude_of_Central_Meridian: -147
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000
      False_Northing: 0
      Planar coordinates are encoded using Row and Column
      Abscissae (x-coordinates) are specified to the nearest 5
      Ordinates (y-coordinates) are specified to the nearest 5
      Planar coordinates are specified in meters
      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: mean lower low water
      Depth_Resolution: 0.01
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute Values
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview: none
    Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    NOAA PIFS, CRED, PIBHMC, JIMAR, and SOEST
  3. To whom should users address questions about the data?
    Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
    NOAA IRC
    Honolulu, HI
    USA

    808 725-5360 (voice)
    nmfs.pic.credinfo@noaa.gov
    Contact_Instructions: e-mail preferred

Why was the data set created?

The data were derived in support of Coral Reef Conservation Program goals. Goal 1 is to map all U.S. Coral Reef Ecosystems. This data set specifically addresses Objective 1 and 4: to develop high-resolution benthic maps and to characterize priority deep water reefs and associated habitats. This derivative of bathymetry provides a GIS layer that may be used for benthic and essential fish habitat characterization, and for the study of geologic features. By combining the dataset with bathymetry, backscatter, other derivatives, and in situ data, they collectively compose benthic habitat maps which are designed to be used to understand and predict moderate depth (~20m to ~150m) benthic habitats for different organisms that inhabit coral reef ecosystems.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 22-Nov-2012 (process 1 of 1)
    Bathymetric Position Index Structures were derived from the gridded multibeam bathymetry for Galvez Bank (gal5m), South Galvez Bank (sgal5m) and Eleven-Mile Reef (ele5m) using the Benthic Terrain Modeler (BTM) Version 3.0 (beta) for ArcGIS10.1 Desktop (https://coast.noaa.gov/digitalcoast//tools/btm/). BPI Structures are derived from two scales (broad and fine-scale) of a focal mean analysis on bathymetry and slope. After testing different experimental combinations, the following broad and fine scales were chosen as best identifying fine-scale structures for Galvez Banks (30 and 150), 11 Mile Reef (50 and 150) and South Galvez 30 and 150). Three ranges of slope define flat, slope, and near vertical: x < 5; 5 < x < 70; x > 70. There may be edge effects at the outer extent of the data.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Data are collected for resource management and research purposes and are tested for internal consistency; however, no effort is made to compare these data to external references or to other published data.
  2. How accurate are the geographic locations?
    Horizontal positioning system: GPS C/A Horizontal position accuracy: 25 meters
  3. How accurate are the heights or depths?
    Range resolution of sonar: varies with depth Raw sounding resolution: varies with depth Vertical accuracy of gridded product ~ 1% of water depth
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    These data are believed to be logically consistent though no tests were performed

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
These data are not to be used for navigation purposes. Please acknowledge the NOAA Pacific Islands Fisheries Science Center (PIFSC) Coral Reef Ecosystem Division (CRED) and the Pacific Islands Benthic Habitat Mapping Center, and the Joint Institute for Marine and Atmospheric Research (JIMAR) and School of Ocean and Earth Science and Technology (SOEST), University of Hawaii as the sources of this information.
  1. Who distributes the data set? (Distributor 1 of 1)
    Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
    NOAA IRC
    Honolulu, HI
    USA

    808 725-5360 (voice)
    nmfs.pic.credinfo@noaa.gov
    Contact_Instructions: e-mail preferred
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    These data are not to be used for navigational purposes. NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 05-Jun-2019
Last Reviewed: 03-Dec-2012
Metadata author:
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
NOAA IRC
Honolulu, HI
USA

808 725-5360 (voice)
nmfs.pic.credinfo@noaa.gov
Contact_Instructions: e-mail preferred
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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