Multibeam Mapping of Selected Areas of the Outer Continental Shelf, Northwestern Gulf of Mexico

Metadata also available as

Metadata:
Identification_Information:

Citation:
Citation_Information:
Originator:
United States Geological Survey (USGS), Coastal and Marine Geology (CMG), Chief Scientist (James V. Gardner)
Publication_Date: 2002
Title:
Multibeam Mapping of Selected Areas of the Outer Continental Shelf, Northwestern Gulf of Mexico
Geospatial_Data_Presentation_Form: XYZ ASCII

Description:
Abstract:
XYZ ASCII format data generated from the 1997 and 2002 multibeam sonar surveys, field activities A-1-97-GM and O-1-02-GM, of selected areas of the outer continental shelf, Northwestern Gulf of Mexico. The data include high-resolution bathymetry and calibrated acoustic backscatter. The specific areas include, East and West Flower Garden Banks, Stetson Bank, Alderdice Bank, Bright Bank, Rankin Banks, Geyer Bank, Jakkula Bank, McGrail Bank, Bouma Bank, MacNeil Bank, and Sonnier Bank.
Purpose:
These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display bathymetry and backscatter data of selected areas of the outer continental shelf, Northwestern Gulf of Mexico.
Supplemental_Information:
Information about USGS Coastal and Marine Geology field activity A-1-97-GM are online at <http://walrus.wr.usgs.gov/infobank/a/a197gm/html/a-1-97-gm.meta.html> Information about USGS Coastal and Marine Geology field activity O-1-02-GM are online at <http://walrus.wr.usgs.gov/infobank/o/o102gm/html/o-1-02-gm.meta.html> >

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19971212
Ending_Date: 20020628
Currentness_Reference: ground condition

Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -94.514
East_Bounding_Coordinate: -91.486
North_Bounding_Coordinate: 28.505
South_Bounding_Coordinate: 27.491

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Marine Geology
Theme_Keyword: Multibeam
Theme_Keyword: Bathymetry
Theme_Keyword: Backscatter
Theme_Keyword: Water Depth
Theme_Keyword: Ocean Floor Topography
Theme_Keyword: Deep-water Reefs
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Northwestern Gulf of Mexico
Place_Keyword: TX
Place_Keyword: Gulf of Mexico
Place_Keyword: USA

Access_Constraints: None

Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Dartnell
Contact_Organization:
United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: 831-460-7415
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: pdartnell@usgs.gov

Cross_Reference:
Citation_Information:
Originator:
United States Geological Survey (USGS), Coastal and Marine Geology (CMG)
Publication_Date: 20020917
Title: USGS CMG O-1-02-GM Metadata
Online_Linkage:
<http://walrus.wr.usgs.gov/infobank/o/o102gm/html/o-1-02-gm.meta.html>
Larger_Work_Citation:
Citation_Information:
Originator:
United States Geological Survey (USGS), Coastal and Marine Geology (CMG)
Publication_Date: 20020917
Title: USGS CMG InfoBank
Online_Linkage: <http://walrus.wr.usgs.gov/infobank/>
Data_Quality_Information:

Attribute_Accuracy:
Attribute_Accuracy_Report: Not determined.

Logical_Consistency_Report: Point features present.

Completeness_Report: Complete

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: 50 centimeters
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Not applicable

Lineage:
Process_Step:
Process_Description:
The bathymetry and backscatter data were collected along a continuous swath perpendicular to the direction of the ship using a Kongsberg Simrad EM1000 multibeam sonar system for the 2002 survey and a Kongsberg Simrad EM300 multibeam sonar system for the 1997 survey. The data were cleaned of bad navigation and depth readings. Backscatter readings were converted from dB (decibels) to DN (digital number) using the convertion, ABSOLUTE VALUE(2DN/dB), where DN: 0-255 and dB: 0 - -127. The data were gridded into a common grid. The gridded data are converted to an XYZ ASCII format file (Longitude, Latitude, Attribute).

Process_Date: 20020628
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Dartnell
Contact_Organization:
United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: 831-460-7415
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: pdartnell@usgs.gov
Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution:
0.00004 (0.00005 for East and West Flower Garden Banks and Stetson Bank)
Longitude_Resolution:
0.00004 (0.00005 for East and West Flower Garden Banks and Stetson Bank)
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137.00 meters
Denominator_of_Flattening_Ratio: 0.003352811

Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Mean lower low water
Depth_Resolution: 0.5% of the water depth
Depth_Distance_Units: meters
Depth_Encoding_Method: Implicit coordinate
Entity_and_Attribute_Information:

Overview_Description:
Entity_and_Attribute_Overview:

Sample of bathymetry XYZ ASCII file 

Longitude, Latitude, Elevation
-86.57406,30.06655,-48.497
-86.57399,30.06655,-48.473
-86.57391,30.06655,-48.418
-86.57383,30.06655,-48.408
-86.57375,30.06655,-48.411
-86.57368,30.06655,-48.415
-86.57430,30.06648,-48.738
-86.57422,30.06648,-48.728
-86.57414,30.06648,-48.678
Sample of Backscatter XYZ ASCII file 
 Longitude, Latitude, DN Value
-86.57421,30.06640,207.696
-86.57413,30.06640,206.398
-86.57405,30.06640,203.770
-86.57398,30.06640,201.170
-86.57390,30.06640,201.098
-86.57382,30.06640,202.064
-86.57374,30.06640,202.693
-86.57367,30.06640,202.720
-86.57444,30.06632,201.992
Entity_and_Attribute_Detail_Citation: none
Distribution_Information:

Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
United States Geological Survey (USGS) Information Services
Contact_Address:
Address_Type: mailing and physical address
Address: Box 25286
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA

Contact_Voice_Telephone: (888)ASK-USGS

Resource_Description: U.S. Geological Survey Open-file Report of02-411

Distribution_Liability:

These data not intended for navigational purposes.

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.

Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.

Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/of/2002/0411/>
Fees: None
Metadata_Reference_Information:

Metadata_Date: 20020821

Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Pete Dartnell
Contact_Organization:
United States Geological Survey (USGS) Coastal and Marine Geology (CMG)
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: USGS, MailStop 999, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-5460
Contact_Facsimile_Telephone: (650) 329-5411
Contact_Electronic_Mail_Address: pdartnell@usgs.gov

Metadata_Standard_Name:
Content Standard for Digital Geospatial Metadata ("CSDGM version 2")

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: universal time

Generated by mp version 2.7.9 on Fri Jan 24 15:03:52 2003