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: XYZ ASCII
Description:
Abstract:
XYZ ASCII 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 determined.
Logical_Consistency_Report: Point features present.
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 multibeam bathymetry and acoustic backscatter 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 GRID was converted to
an XYZ ASCII file by using the GRIDPOINT, ADDXY, and Tables' UNLOAD commands.
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: 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: 0.00016
Longitude_Resolution: 0.00016
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
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Sample of Bathymetry XYZ ASCII file
> Longitude, Latitude, Depth
> (decimal degrees, decimal degrees, meters)
>-118.65763,34.02052,-32.661
>-118.65747,34.02052,-32.673
>-118.65731,34.02052,-32.684
>-118.65715,34.02052,-32.684
>-118.65699,34.02052,-32.684
>-118.65683,34.02052,-32.727
>-118.65668,34.02052,-32.764
>-118.65652,34.02052,-32.756
>-118.65636,34.02052,-32.739
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: ASCII
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: 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