Bathymetry and Acoustic Backscatter: Northern Santa Barbara Channel, Southern California

Metadata also available as

Metadata:

Identification_Information:


Citation:
Citation_Information:
Originator: United States Geological Survey (USGS)
Publication_Date: 2010
Title:
Bathymetry and Acoustic Backscatter: Northern Santa Barbara Channel, Southern California
Geospatial_Data_Presentation_Form: Raster
Online_Linkage: <https://pubs.usgs.gov/of/2009/1289/>
Online_Linkage: <https://pubs.usgs.gov/of/2009/1289/data.html>



Larger_Work_Citation:
Citation_Information:
Originator: Peter Dartnell
Originator: David Finlayson
Originator: James Conrad
Originator: Guy Cochrane
Originator: Samuel Johnson
Publication_Date: 2010
Title:
Bathymetry and Acoustic Backscatter: Northern Santa Barbara Channel, Southern California
Edition: 1.0
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2009-1289
Publication_Information:
Publication_Place:
Western Coastal and Marine Geology, Menlo Park, CA
Publisher:
U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage:
<https://pubs.usgs.gov/of/2009/1289/>

Description:
Abstract:
This report presents bathymetry and acoustic backscatter data collected in July 2008 in the northern Santa Barbara Channel, California, using a bathymetric sidescan system. The report also presents a summary of the mapping effort as well as Federal Geographic Data Committee (FGDC) metadata. This metadata file describes the backscatter data.
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 the bathymetry and acoustic backscatter data model.
Supplemental_Information:
Information for the related USGS Coastal and Marine Geology data collection field activity, S8-08-SC, is online at <http://walrus.wr.usgs.gov/infobank/s/s808sc/html/s-8-08-sc.meta.html>.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20080708
Ending_Date: 20080723
Currentness_Reference: ground condition

Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed


Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -120.5000000
East_Bounding_Coordinate: -120.0000000
North_Bounding_Coordinate: 34.50000000
South_Bounding_Coordinate: 34.25000000


Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: Marine Geology
Theme_Keyword: Multibeam
Theme_Keyword: Geology
Theme_Keyword: Bathymetry
Theme_Keyword: Backscatter
Theme_Keyword: Water Depth
Theme_Keyword: Ocean Floor Topography
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP

Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: bathymetry
Theme_Keyword: imageryBaseMapsEarthCover

Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Santa Barbara Channel
Place_Keyword: Refugio Beach
Place_Keyword: El Capitan Beach
Place_Keyword: Santa Barbara
Place_Keyword: CA
Place_Keyword: California
Place_Keyword: USA


Access_Constraints: None


Use_Constraints:

Please recognize the U.S. Geological Survey (USGS). 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:
U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 345 Middlefield Rd MS-999
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
Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/of/2009/1289/images/usgs2008_mos.pdf>
Browse_Graphic_File_Description: Illustration of backscatter imagery
Browse_Graphic_File_Type: JPEG
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.



Lineage:
Process_Step:
Process_Description:
The bathymetry and backscatter data were collected using 234.5 kHz SEA (AP) Ltd. SWATHplus-M phase-differencing sidescan sonar aboard the USGS R/V Parke Snavely. The survey vessel was equipped with a CodaOctopus F190 attitude and position system. This system combines Real Time Kinematic (RTK) Global Positioning System (GPS) data (2 cm error ellipse) with inertial motion measurements so that high-precision position and attitude corrections are fed in real-time to the sonar acquisition equipment. Up to 10 pings per second are transmitted with each ping consisting of 2048 samples per side (port and starboard). The returned samples were projected to the seafloor using a ray-tracing algorithm working with the previously measured sound velocity profiles. A series of statistical filters were applied to the raw samples that discriminate the seafloor returns from other unintended targets in the water column. Finally, the processed data were stored, line-by-line in processed trackline files. The individual soundings stored in the processed trackline files were combined into a 2-m resolution rasters in the Grid Processor software. The 2-m binned amplitude values were exported from Grid Processor as an XYZ point cloud. The WGS84 (G1150) ellipsoidal coordinates of the survey were transformed into NAD83 (CORS96) ellipsoidal coordinates using a 7-parameter Helmert transformation available in the CS2CS program in the Proj.4 library (Version 442 for 32-bit Windows). The seven required parameters for the procedure were calculated using an Epoch date of 8 July 2008 according to procedure outlined in Soler and Snay (2004). Finally, the resulting NAD83 (CORS96) elevation postings were transformed into NAVD 1988 using the NOAA VDatum (Version 2.2.4) with the Geoid03 model. A script divided the 2-m binned point cloud into 2 x 2 km tiles. Each tile was gridded using Surfer (Version 9.2.397) and a linear Krigging algorithm and 0.20 cm nugget (the mean standard deviation of all 2-m cells in the survey). Finally, the 2-km tiles were mosaiced into a contiguous raster and converted to an ESRI GRID.

Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David Finlayson
Contact_Organization:
U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Operational Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 400 Natural Bridges Dr.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 427-4757
Contact_Electronic_Mail_Address: dfinlayson@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: 10
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -123.00000
Latitude_of_Projection_Origin: 0.00000
False_Easting: 500000.0
False_Northing: 0.00
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 2.0
Ordinate_Resolution: 2.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: NAD83
Ellipsoid_Name: NAVD88
Semi-major_Axis: 6378137.00 meters
Denominator_of_Flattening_Ratio: 0.003352811


Entity_and_Attribute_Information:

Overview_Description:
Entity_and_Attribute_Overview:
The backscatter data was originally archived as an ESRI grid with the following attributes: 
Cell size = 2.0
Number of rows = 6001
Number of columns = 11001

Data type = floating point

Boundary
Xmin = 755999.0
Xmax = 778001.0
Ymin = 3807999.0
Ymax = 3820001.0

Statistics
Minimum value = 12165.5
Maximum value = 58482.87
Mean = 31953.76
Standard deviation = 3448.79

Coordinate system description
Projection  UTM
Zone  10
Datum  NAD83
Units  meters
These data are published in this report in three different formats with the following attributes, 
BACKSC.TIFF
Imageformat = TIFF
Image type = grayscale
Image colormap = false
Image compressed = false
Image rotate = false

Image depth = 16
Image bands = 1
Number of columns = 6001
Number of rows = 11001
Pixel size DX = 2.0
Pixel size DY = 2.0

Boundary
Xmin = 755999.0
Xmax = 778001.0
Ymin = 3807999.0
Ymax = 3820001.0

BACKSC.XYZ
XYZ file (x-coord, y-coord, depth) created from the ESRI grid using the command "GRIDPOINT".

BACKSC.ASC
ASCIIRASTER files created from the ESRI grid using the command "GRIDASCII".
Entity_and_Attribute_Detail_Citation: none



Distribution_Information:


Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Information Services
Contact_Address:
Address_Type: mailing and physical address
Address: 345 Middlefield Rd MS-532
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: (650) 329-4309


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: ESRI GRID
Format_Version_Number: 9.1
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: none
Fees: None






Metadata_Reference_Information:


Metadata_Date: 20081110



Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Dartnell
Contact_Organization:
U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 345 Middlefield Rd MS-999
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 2.9.8 on Wed Apr 14 08:12:30 2010