Acoustic Backscatter - Outer Mainland Shelf, Eastern Santa Barbara Channel, California

Metadata also available as

Metadata:

Identification_Information:


Citation:
Citation_Information:
Originator: United States Geological Survey (USGS)
Publication_Date: 2012
Title:
Acoustic Backscatter - Outer Mainland Shelf, Eastern Santa Barbara Channel, California
Geospatial_Data_Presentation_Form: Raster
Online_Linkage: <https://pubs.usgs.gov/ds/702/data.html>



Larger_Work_Citation:
Citation_Information:
Originator: Peter Dartnell
Originator: Andy Ritchie
Originator: David Finlayson
Originator: Guy Cochrane
Originator: Mercedes Erdey
Publication_Date: 2012
Title:
Bathymetry and Acoustic Backscatter - Outer Mainland Shelf, Eastern Santa Barbara Channel, California
Edition: 1.0
Series_Information:
Series_Name: Data Series
Issue_Identification: 702
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage:
<https://pubs.usgs.gov/ds/702/>

Description:
Abstract:
The U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center in cooperation with the Bureau of Ocean Energy Management (BOEM) collected high-resolution bathymetry and acoustic backscatter data along the outer mainland shelf in the eastern Santa Barbara Channel, southern California. These data were collected in July 2010 and July 2011 using a bathymetric sidescan system. This report provides the bathymetry and backscatter data along with a summary of the mapping efforts and Federal Geographic Data Committee (FGDC) metadata. This metadata file describes the acoustic 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 acoustic backscatter data. These data are not intended for navigational purposes.
Supplemental_Information:
Information for the related USGS Pacific Coastal and Marine Science Center data collection field activities, S-14-10-SC and S-08-11-SC, online at <http://walrus.wr.usgs.gov/infobank/s/s1410sc/html/s-14-10-sc.meta.html> and <http://walrus.wr.usgs.gov/infobank/s/s0811sc/html/s-08-11-sc.meta.html>.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100628
Ending_Date: 20110726
Currentness_Reference: ground condition

Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed


Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -119.7500000
East_Bounding_Coordinate: -119.2500000
North_Bounding_Coordinate: 34.37000000
South_Bounding_Coordinate: 34.10000000


Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: Marine Geology
Theme_Keyword: Multibeam
Theme_Keyword: Geology
Theme_Keyword: Bathymetry
Theme_Keyword: Backscatter
Theme_Keyword: Intensity
Theme_Keyword: Ocean Floor Topography
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: CMGP

Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificinformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: oceans

Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Santa Barbara Channel
Place_Keyword: Ventura
Place_Keyword: Carpinteria
Place_Keyword: Santa Barbara
Place_Keyword: State of California

Place:
Place_Keyword_Thesaurus: General
Place_Keyword: California
Place_Keyword: CA
Place_Keyword: USA


Access_Constraints: None


Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) and the Bureau of Ocean Energy Management (BOEM). USGS-authored or produced data and information are in the public domain.
This information is not intended for navigational purposes.
Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Dartnell
Contact_Organization:
U.S. Geological Survey, Pacifc Coastal and Marine Science Center
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 400 Natural Bridge Dr.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7415
Contact_Facsimile_Telephone: (831) 427-4709
Contact_Electronic_Mail_Address: pdartnell@usgs.gov


Browse_Graphic:
Browse_Graphic_File_Name: <https://pubs.usgs.gov/ds/702/figures/backscatter_map.gif>
Browse_Graphic_File_Description:
Acoustic backscatter imagery of the eastern Santa Barbara Channel region
Browse_Graphic_File_Type: GIF

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: Not applicable



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 centimeter 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 are projected to the seafloor using a ray-tracing algorithm working with the previously measured sound velocity profiles. A series of statistical filters are applied to the raw samples that discriminate the seafloor returns from other unintended targets in the water column. The raw 16-bit backscatter data recorded simultaneously with bathymetry by the SWATHplus was georeferenced and gain-normalized by the program SXPEGN, software written by the USGS to enhance the backscatter of the SWATHplus system. The program normalizes for time-varying signal loss and beam directivity differences. The resulting normalized amplitude values are re-scaled to 16-bit, and gridded into GeoJPEGS using GRID Processor Software supplied by SEA. The images were converted to geoTIFF images using ESRI GIS software.

Process_Date: 2012
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Pete Dartnell
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 400 Natural Bridges Dr.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7415
Contact_Electronic_Mail_Address: pdartnell@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: 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 complete 2010 - 2011 acoustic backscatter data was originally archived as an ESRI grid with the following attributes: 
Cell size = 2.0
Number of rows = 14,271
Number of columns = 21,553

Data type = floating point

Boundary
Xmin = 247426.13
Xmax = 290542.13
Ymin = 3777642.27
Ymax = 3806184.27

Statistics
Minimum value = 0
Maximum value = 65535
Mean = 2712641
Standard deviation = 11370.68

Coordinate system description
Projection  UTM
Zone  11
Datum  NAD83
Units  meter
Entity_and_Attribute_Detail_Citation: none



Distribution_Information:


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


Distribution_Liability:

This information is not intended for navigational purposes.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.


Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCIIRASTER and geoTIFF
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://pubs.usgs.gov/ds/702/>
Fees: None


Metadata_Reference_Information:


Metadata_Date: 20120325
Metadata_Review_Date: 20120403



Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter Dartnell
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 400 Natural Bridges Dr.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: (831) 460-7415
Contact_Facsimile_Telephone: (831) 427-4709
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 2.9.13 on Thu Jul 26 10:55:43 2012