CRED Gridded bathymetry of the channel between Tutuila and Aunuu, American Samoa

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Benthic Habitat Mapping Group, CRED, PIFSC, NOAA

Publication_Date: 20040314

Title:

CRED Gridded bathymetry of the channel between Tutuila and Aunuu, American Samoa

Geospatial_Data_Presentation_Form: raster digital data

Online_Linkage: <ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/aunuu-5.asc.zip>

Online_Linkage: <ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/aunuu-5.grd.zip>

Description:

Abstract:

Gridded bathymetry of the channel between Tutuila and Aunuu, Amercian Samoa

Purpose:

This grid was created using data gathered from multibeam soundings for use as a planning and reference document. Refer to supplemental information for description of instrument and survey.

Supplemental_Information:

Data were collected aboard the R/V AHI (Acoustic Habitat Investigator), a 25&oacute; survey launch owned and operated by the NOAA Pacific Islands Fisheries Science Center in Honolulu, HI. The R/V AHI&oacute;s survey sensors include a 240 kHz RESON 8101-ER sonar providing bathymetry and imagery data, a TSS/Applanix POS/MV Model 320 which measures position, velocity, attitude and heading, and a Seabird SBE 19 CTD used to measure sound velocity profiles.

Equipment serial numbers and software versions are as follows:

RESON 8101-ER multibeam echosounder DOC inventory #: CD0000537418 Firmware, dry: 8101-2.07-2D4D Firmware, wet: 8101-1.06-2F6B

POS/MV Model 320, version 3 DOC inventory #: CD0000476647 PCS serial #: 474 IMU serial #: 203 Controller software: v 1.0.5.0

Seabird SBE19 CTD: Serial #: 3029

R/V AHI Lever Arm Distances and Alignment Offsets The R/V AHI Reference Point (RP) is defined to be the intersection of the vessel's centerline, the cabin deck and the bulkhead immediately aft of the transducer. This is marked by a punch in the deck weld at that location. Positive X means the point is forward of the RP, positive Y means the point is to starboard of the RP, positive Z means the point is below the RP. The loaded waterline is defined as the intersection of the vessel&oacute;s performance wing with the hull at the transom.

Antenna Baseline Distance, m: 1.229 Transducer depth below waterline, m 0.62

RP to IMU 0.80 0.00 0.08 RP to Primary GPS Antenna -3.55 -0.61 -1.88 RP to Vessel 0.16 0.00 0.77 RP to Sensor 1(MB transducer) 0.16 0.00 0.77 RP to Sensor 2 0 0 0 RP to Aux. GPS Antenna 0 0 0 RP to Heave lever arm(deg) -0.67 0.00 0.00 IMU rotation Ref. Frame, deg 0 0 0 Sensor 1 rotation Ref. Frame, deg 0 0 0 Sensor 2 rotation Ref. Frame, deg 0 0 0

Roll offset: +0.5 deg Pitch offset: 0.0 deg Gyro offset: 0.0 deg

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20040206

Ending_Date: 20040312

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -170.583291

East_Bounding_Coordinate: -170.545449

North_Bounding_Coordinate: -14.260931

South_Bounding_Coordinate: -14.260931

Keywords:

Theme:

Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus

Theme_Keyword:

EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry

Theme:

Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus

Theme_Keyword: Numeric Data Sets > Bathymetry

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Gridded bathymetry

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: elevation

Theme_Keyword: 006

Place:

Place_Keyword_Thesaurus: CoRIS Place Thesaurus

Place_Keyword:

OCEAN BASIN > Pacific Ocean > American Samoa > American Samoa (14S170W0000)

Place_Keyword:

COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > American Samoa (14S170W0000)

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Aunuu

Place_Keyword: Tutuila

Place_Keyword: American Samoa

Access_Constraints: None

Use_Constraints:

These data are not to be used for navigation purposes. Please acknowledge the NOAA Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center as the source of this information.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Benthic Habitat Mapping Group,
Coral Reef Ecosystem Division, PIFSC,NOAA

Contact_Person: Joyce Miller

Contact_Address:

Address_Type: mailing and physical address

Address: 1125B Ala Moana Blvd

City: Honolulu

State_or_Province: HI

Postal_Code: 96814

Country: USA

Contact_Voice_Telephone: 808-592-8303

Contact_Electronic_Mail_Address: joyce.miller@noaa.gov

Browse_Graphic:

Browse_Graphic_File_Name:

<http://www.pifsc.noaa.gov/cred/hmapping/img/original/06i-aunuu-5.jpg>

Browse_Graphic_File_Description: Gridded Bathymetry

Browse_Graphic_File_Type: JPEG

Data_Set_Credit:

Benthic Habitat Mapping Group, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

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: Unspecified

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Horizontal positioning system: GPS SPS Horizontal position accuracy: 5

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Range resolution of sonar ~ 1.25 cm Raw sounding resolution: 1 cm Vertical accuracy of gridded product ~ 1 meter

Lineage:

Process_Step:

Process_Description:

Science Applications International Corporation&oacute;s (SAIC) ISS-2000 acquires, processes and records data, provides survey control and underway quality control displays. SAIC&oacute;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. GMT was then used to reformat the grid into final form. Interactive Visualization System&oacute;s Fledermaus and ESRI ArcGIS were used for viewing results and creating browse objects.

The data have been corrected for predicted tides based on the NOAA NOS tide station in Pago Pago harbor

Software used: SAIC ISS-2000 Acquisition Software, v 3.4.4 (20040114) SAIC SABER Processing Software, v 3.0 (20031218) GMT Generic Mapping Tools, v 3.4.2 (20021002)

Process_Date: 20040314

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 728

Column_Count: 815

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: -2

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -171

Latitude_of_Projection_Origin: 0

False_Easting: 500000

False_Northing: 10000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: Row and Column

Coordinate_Representation:

Abscissa_Resolution: 5

Ordinate_Resolution: 5

Planar_Distance_Units: meters

Geodetic_Model:

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:

Depth_System_Definition:

Depth_Datum_Name: mean lower low water

Depth_Resolution: 0.01

Depth_Distance_Units: meters

Depth_Encoding_Method: Attribute Values

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Depth values are real values based on the average of the soundings that fell within the extracted grid cells. Number of soundings per grid cell range from >1000 soundings in shallow depths to as few as 20 soundings in deeper areas. A total error budget for this survey has not been developed, therefore the accuracy of depth measurements should be considered to be within 1 meter.

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Benthic Habitat Mapping Group, CRED, PIFSC, NOAA

Contact_Person: Joyce E. Miller

Contact_Position: Oceanographer

Contact_Address:

Address_Type: mailing and physical address

Address: 1125 'B' Ala Moana Blvd

City: Honolulu

State_or_Province: Hawaii

Postal_Code: 96814

Country: USA

Contact_Voice_Telephone: 808-592-8303

Contact_Electronic_Mail_Address: joyce.miller@noaa.gov

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:

Digital_Form:

Digital_Transfer_Information:

Format_Name: netCDF

Format_Information_Content:

Binary netCDF Grid: 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), which created this file.

More information can be be located at <http://gmt.soest.hawaii.edu> and <http://unidata.ucar.edu/packages/netcdf/index.html>

File_Decompression_Technique: Zip file

Transfer_Size: 1.2

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/aunuu-5.grd.zip>

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII ARC/INFO Grid

Format_Information_Content:

ASCII ARC/INFO Grid: Files of this type can be imported with ArcToolbox 8.3 using the following path: Conversion Tools;Import to Raster;ASCII to Grid (Float). The Arc Toolbox on-line help describes these data as having the following header format and description

NCOLS xxx NROWS xxx XLLCORNER xxx YLLCORNER xxx CELLSIZE xxx NODATA_VALUE xxx ROW 1 ROW 2 . . . ROW n

where: NCOLS is the number of columns in the ASCII file. NROWS is the number of rows in the ASCII file. XLLCORNER is the x coordinate for the lower left corner of the lower left most cell in the grid. YLLCORNER is the x coordinate for the lower left corner of the lower left most cell in the grid. CELLSIZE is the length of a cell&oacute;s edge. NODATA_VALUE is the value in the ASCII file representing unknown values.

xxx are numbers, and the cell values are space delimited.

File_Decompression_Technique: Zip file

Transfer_Size: 2.1

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/aunuu-5.asc.zip>

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20080812

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Benthic Habitat Mapping Group, CRED, PIFSC, NOAA

Contact_Person: Dr. Michael Parke

Contact_Position: Research Biologist

Contact_Address:

Address_Type: mailing and physical address

Address: 1125 'B' Ala Moana Blvd

City: Honolulu

State_or_Province: Hawaii

Postal_Code: 96814

Country: USA

Contact_Voice_Telephone: 808-592-7025

Contact_Electronic_Mail_Address: michael.parke@noaa.gov

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: Local Time

Metadata_Access_Constraints: None

Metadata_Use_Constraints: None