Multibeam Bathymetry of the Los Angeles, California Margin

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:

United States Geological Survey (USGS), Coastal and Marine Geology (CMG), Chief Scientist (James V. Gardner)

Publication_Date: 2002

Title: Multibeam Bathymetry of the Los Angeles, California Margin

Geospatial_Data_Presentation_Form: ArcInfo GRID

Description:

Abstract:

ArcInfo GRID format data generated from the 1996, 1998, and 1999 multibeam sonar surveys of the Los Angeles, California Margin. The data include high-resolution bathymetry.

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 data of the Los Angeles, California Margin.

Supplemental_Information:

Information for USGS Coastal and Marine Geology related activities are online at < <http://walrus.wr.usgs.gov/infobank/c/c196sc/html/c-1-96-sc.meta.html> < <http://walrus.wr.usgs.gov/infobank/a/a398sc/html/a-3-98-sc.meta.html> < <http://walrus.wr.usgs.gov/infobank/c/c199sc/html/c-1-99-sc.meta.html>

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19960930

Ending_Date: 19990518

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -118.850

East_Bounding_Coordinate: -117.754

North_Bounding_Coordinate: 34.029

South_Bounding_Coordinate: 33.334

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Marine Geology

Theme_Keyword: Multibeam

Theme_Keyword: Bathymetry

Theme_Keyword: Water Depth

Theme_Keyword: Ocean Floor Topography

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Los Angeles Margin

Place_Keyword: CA

Place_Keyword: Southern California

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: James V. Gardner

Contact_Organization:

United States Geological Survey (USGS) Coastal and Marine Geology (CMG)

Contact_Position: Geologist

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) 329-5469

Contact_Facsimile_Telephone: (650) 329-5411

Contact_Electronic_Mail_Address: jvgardner@usgs.gov

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: Not applicable for raster data.

Logical_Consistency_Report: Unspecified

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: 0.5 meters

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

0.05 percent of the water depth. Depths corrected to mean lower low water datum.

Lineage:

Process_Step:

Process_Description:

The bathymetry data were collected along a continuous swath perpendicular to the direction of the ship using Kongsberg Simrad EM300, EM1000, and dual EM3000 multibeam sonar systems. The data are cleaned of bad navigation and depth readings and corrected for tides to mean lower low water datum. The depth readings are gridded into a common grid. The gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command. The three surveys were merged together into one dataset using the ArcInfo GRID function, MOSAIC.

Process_Date: 20020115

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: James V. Gardner

Contact_Organization:

United States Geological Survey (USGS) Coastal and Marine Geology (CMG)

Contact_Position: Geologist

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) 329-5469

Contact_Facsimile_Telephone: (650) 329-5411

Contact_Electronic_Mail_Address: jvgardner@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 11

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -117.00000

Latitude_of_Projection_Origin: 0.00000

False_Easting: 0.00

False_Northing: 0.00

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 16.0

Ordinate_Resolution: 16.0

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: WGS84

Ellipsoid_Name: WGS84

Semi-major_Axis: 6378137.00 meters

Denominator_of_Flattening_Ratio: 0.003352811

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

BATHYG is an ArcInfo GRID with the following attributes: Cell Size = 16.000 Data Type: Floating Point Number of Rows = 4740 Number of Columns = 6409

BOUNDARY Xmin = 327786.363 Xmax = 430330.363 Ymin = 3689836.907 Ymax = 3765676.907

STATISTICS Minimum Value = -910.430 Maximum Value = -1.956 Mean = -379.363 Standard Deviation = 283.239 Depths corrected for tides to mean lower low water

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: 345 Middlefield Rd., MS-999

City: Menlo Park

State_or_Province: CA

Postal_Code: 94025

Country: USA

Contact_Voice_Telephone: (650)329-5469

Resource_Description: C-1-96-SC, A-3-98-SC, and C-1-99-SC data sets

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: ArcInfo GRID

Format_Version_Number: 8.0.2

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: none

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20020206

Metadata_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, 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