CRED Simrad em3002d multibeam backscatter data from the banktop and bank edge environments at Tutuila, American Samoa, South Pacific with 16 meter resolution in netCDF format
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Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator:
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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)
- Publication_Date: 20070501
- Title:
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CRED Simrad em3002d multibeam backscatter data from the banktop and bank edge environments at Tutuila, American Samoa, South Pacific with 16 meter resolution in netCDF format
- Geospatial_Data_Presentation_Form: digital data
- Online_Linkage:
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http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_tutuila_backscat.htm
- Description:
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- Abstract:
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Multibeam backscatter imagery extracted from gridded bathymetry of Tutuila, American Samoa, South Pacific
These data provide coverage between 20 and 5000 meters. The backscatter dataset includes data collected using Simrad EM3002d and
Reson 8101 multibeam sonars. The sonars frequencies are 300 kHz and 240 kHz respectively and the backscatter data from each sonar
are processed and gridded separately. These metadata are for the 16 m grid cell size Simrad em3002d multibeam backscatter data only.
- Purpose:
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The netCDF grids of backscatter imagery were created using data gathered from multibeam
soundings for use as a planning and reference document. The data are also being used
for benthic habitat mapping, for locating Essential Fish Habitat, and for studying
geologic features of the area. Refer to supplemental information for description of
instrument and survey.
- Supplemental_Information:
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Multibeam data were collected aboard the NOAA Ship Hi'ialakai, a 218' United
States National Oceanographic and Atmospheric Administration research ship. The
NOAA Ship Hi'ialakai's survey sensors include a 30 kHz Simrad EM300 sonar and a
300 kHz Simrad EM3002d sonar, which provide bathymetry and imagery data, a
TSS/Applanix POS/MV Model 320, which measures position, velocity, attitude and
heading, and a Seabird SBE 9/11 plus CTD used to measure sound velocity profiles.
Specific equipment configurations are documented in metadata from cruises: HI0602.
These metadata can be accessed at:
http://www.soest.hawaii.edu/pibhmc/cms/cruise-catalog/.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Range_of_Dates/Times:
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- Beginning_Date: 20060217
- Ending_Date: 20060224
- Currentness_Reference: ground condition
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -170.93
- East_Bounding_Coordinate: -170.56
- North_Bounding_Coordinate: -14.21
- South_Bounding_Coordinate: -14.38
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: NCEI Geoportal Filter
- Theme_Keyword: CoRIS_Metadata
- Theme:
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- Theme_Keyword_Thesaurus: CRCP Project
- Theme_Keyword:
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Benthic Habitat Mapping and Characterization - American Samoa and PRIA
- Theme_Keyword: 2034
- Theme_Keyword:
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Benthic Habitat Mapping and Characterization - American Samoa and PRIA
- Theme_Keyword: 1084-06
- Theme:
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- Theme_Keyword_Thesaurus: none
- Theme_Keyword:
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EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography > Backscatter
- Theme_Keyword: Acoustic Imagery
- Theme_Keyword: Multibeam Backscatter
- Theme_Keyword: Backscatter
- Theme:
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- Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus
- Theme_Keyword:
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EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Backscatter
- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Category
- Theme_Keyword: oceans
- Theme_Keyword: 014
- Theme_Keyword: elevation
- Theme_Keyword: 006
- Theme:
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- Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
- Theme_Keyword: Geographic Information > Backscatter
- Place:
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- Place_Keyword_Thesaurus: CoRIS Place Thesaurus
- Place_Keyword:
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OCEAN BASIN > Pacific Ocean > American Samoa > Tutuila Island (14S170W0016)
- Place_Keyword:
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COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Tutuila Island (14S170W0016)
- Place:
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- Place_Keyword_Thesaurus: None
- Place_Keyword: Tutuila Island
- Place_Keyword: American Samoa
- Place_Keyword: South Pacific
- Place_Keyword: Pacific Ocean
- Place:
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- Place_Keyword_Thesaurus: none
- Place_Keyword:
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OCEAN BASIN > Pacific Ocean > South Pacific Ocean > Pacific > American Samoa > Tutuila Island
- Place_Keyword: COUNTRY/TERRITORY > United States of America > American Samoa
- Place:
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- Place_Keyword_Thesaurus: CoRIS Region
- Place_Keyword: AmSam
- Access_Constraints: None
- Use_Constraints:
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These data are not to be used for navigation purposes.
Please acknowledge NOAA and the Joint Institute for Marine and Atmospheric Research (JIMAR)
University of Hawaii as the sources of this information.
- Point_of_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization:
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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)
- Contact_Address:
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- Address_Type: mailing and physical address
- Address: NOAA IRC
- Address: NMFS/PIFSC/CRED
- Address: 1845 WASP Blvd., Building 176
- City: Honolulu
- State_or_Province: HI
- Postal_Code: 96818
- Contact_Voice_Telephone: 808 725-5360
- Contact_Facsimile_Telephone: 808 725-5429
- Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
- Contact_Instructions: e-mail preferred
- Browse_Graphic:
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- Browse_Graphic_File_Name:
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http://www.soest.hawaii.edu/pibhmc/amsamoa_images/tutuila-bs_440.jpg
- Browse_Graphic_File_Description: Multibeam Backscatter, Acoustic Imagery
- Browse_Graphic_File_Type: JPEG
- Browse_Graphic:
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- Browse_Graphic_File_Name:
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http://www.soest.hawaii.edu/pibhmc/amsamoa_images/tutuila-em3002d-bs-boxes_440.jpg
- Browse_Graphic_File_Description: Multibeam Backscatter, Acoustic Imagery
- Browse_Graphic_File_Type: JPEG
- Data_Set_Credit: PIBHMC, CRED, PIFSC, NOAA and JIMAR
- Security_Information:
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- Security_Classification_System: Not applicable
- Security_Classification: Unclassified
- Security_Handling_Description: Not applicable
- Native_Data_Set_Environment: netCDF file created using HMRG software in a LINUX environment
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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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.
- Logical_Consistency_Report:
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These data are believed to be logically consistent
though no tests were performed
- Completeness_Report: Complete
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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Horizontal positioning system: GPS (SPS)
Horizontal position accuracy: 25 meters
- Vertical_Positional_Accuracy:
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- Vertical_Positional_Accuracy_Report:
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1 m
Range resolution of sonar ~1.25 cm
Raw sounding resolution: Variable
Vertical accuracy of gridded product: 1% of water depth
- Lineage:
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- Process_Step:
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- Process_Description:
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Science Applications International Corporation's (SAIC) ISS-2000 acquires,
processes and records data, provides survey control and underway quality
control displays. SAIC's SABER processing software is used to process the
raw soundings, analyze the results, manually edit the sounding data to remove
outliers and derive average gridded data values. Additional data acquisition
and processing information can be found in the metadata for cruise HI0602.
Hawaii Mapping Research Group (HMRG) processing software was then used to
extract values of acoustic intensity from the soundings. HMRG is an organization
of scientists, engineers and technicians whose mission is to design, build,
and operate tools for mapping the seafloor. HMRG is a group within the School
of Ocean and Earth Science and Technology at the University of Hawaii at Manoa.
The gsf2bs program (July, 2005) converts the swath bathymetry ping records contained
within a GSF (Generic Sensor Format) version 2.02 dataset into bs file format. This
is done as follows: (i) position each beam's bottom detect intensity sample at the
across-track location of that beam's bathymetry value; (ii) assuming a flat bottom
in the near neighborhood of the beam, compute across-track distances for all of the
beam's remaining intensity samples based on their temporal relation to the bottom
detect sample and the computed average sound velocity for that beam as derived from
its range and travel time; (iii) after all of the intensity samples from all beams
of a ping have been located in across-track distance, fill the gaps between them as
necessary by comparing travel times of beams adjacent to the gap, assigning the position
using the adjacent sample closest to nadir, and averaging the interpolated values that
fall within a cell. The conversion described above is necessary in order to run HMRG
backscatter processing operations on the data, such as filtering to remove noise, and to
create netCDF grids, raster images and GeoTIFF's. In addition to the standard processing
routines applied to Simrad em3002d backscatter data, an additional gain correction was
applied to the data to address a systematic mismatch in received acoustic signal strength
between the port and starboard sonar heads. Data with a lower strength were multiplied by
an empirically determined scaling factor. For more information on the backscatter processing
technique see <http://www.soest.hawaii.edu/pibhmc/pibhmc_documentation.htm>.
Software_Used:
SAIC ISS-2000 Acquisition Software, v 3.4
SAIC SABER Processing Software, v 3.3.15
Hawaii Mapping Research Group (HMRG) Processing Software
GMT Generic Mapping Tools, v 4.1
MB System, v 5.0.7
- Process_Date: 20070328
- Spatial_Data_Organization_Information:
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- Direct_Spatial_Reference_Method: Raster
- Raster_Object_Information:
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- Raster_Object_Type: Grid Cell
- Row_Count: 2407
- Column_Count: 2830
- Vertical_Count: 1
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Grid_Coordinate_System:
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- Grid_Coordinate_System_Name: Universal Transverse Mercator
- Universal_Transverse_Mercator:
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- UTM_Zone_Number: -2
- Transverse_Mercator:
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- Scale_Factor_at_Central_Meridian: 0.9996
- Longitude_of_Central_Meridian: -171
- Latitude_of_Projection_Origin: 0
- False_Easting: 500000
- False_Northing: 0
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: Row and Column
- Coordinate_Representation:
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- Abscissa_Resolution: 16
- Ordinate_Resolution: 16
- Planar_Distance_Units: meters
- Geodetic_Model:
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- Horizontal_Datum_Name: D_WGS_1984
- Ellipsoid_Name: WGS_1984
- Semi-major_Axis: 6378137.000000
- Denominator_of_Flattening_Ratio: 298.257224
- Vertical_Coordinate_System_Definition:
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- Depth_System_Definition:
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- Depth_Datum_Name: mean lower low water
- Depth_Resolution: 0.01
- Depth_Distance_Units: meters
- Depth_Encoding_Method: Attribute Values
- Entity_and_Attribute_Information:
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- Overview_Description:
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- Entity_and_Attribute_Overview:
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Sidescan data within a GSF file are arranged as small sequences of intensity
values, one sequence per beam per ping. The intensity values represent the
amplitude of echo returns to the sensor and can be related to seabed
roughness.
- Entity_and_Attribute_Detail_Citation: none
- Distribution_Information:
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- Distributor:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization:
-
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)
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: NOAA IRC
- Address: NMFS/PIFSC/CRED
- Address: 1845 WASP Blvd., Building 176
- City: Honolulu
- State_or_Province: HI
- Postal_Code: 96818
- Contact_Voice_Telephone: 808 725-5360
- Contact_Facsimile_Telephone: 808 725-5429
- Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
- Contact_Instructions: e-mail preferred
- Resource_Description: Downloadable Data
- Distribution_Liability:
-
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.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Format_Name: netCDF, .grd
- Format_Information_Content:
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This file is formatted as a 2-D binary netCDF grid file. This is the
default grid file format used by GMT (Generic Mapping Tools). The file
was created by the HMRG sofware program bsovl. More information about
netCDF files can be found at at http://www.soest.hawaii.edu/gmt/ and
http://www.unidata.ucar.edu/software/netcdf/.
- File_Decompression_Technique: none
- Digital_Transfer_Option:
-
- Online_Option:
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- Computer_Contact_Information:
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- Network_Address:
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- Network_Resource_Name:
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http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_tutuila_backscat.htm
- Fees: None
- Metadata_Reference_Information:
-
- Metadata_Date: 20190605
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization:
-
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)
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: NOAA IRC
- Address: NMFS/PIFSC/CRED
- Address: 1845 WASP Blvd., Building 176
- City: Honolulu
- State_or_Province: HI
- Postal_Code: 96818
- Contact_Voice_Telephone: 808 725-5360
- Contact_Facsimile_Telephone: 808 725-5429
- Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
- Contact_Instructions: e-mail preferred
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: Universal Time
- Metadata_Access_Constraints: None
- Metadata_Use_Constraints: None
- CoRIS:
-
- CoRIS_ID: 20090508112158
- CoRIS_Children: None
- CoRIS_Beginning_Date: 20060217
- CoRIS_Ending_Date: 20060224
- CoRIS_Metadata_Link:
-
https://www.coris.noaa.gov/metadata/records/html/cred_16m_tutuila_backscatter_em3002d.html
- CoRIS_Tracking_ID: 2580
Generated by mp version 2.9.48 on Wed Apr 24 10:37:16 2024