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: http://pubs.usgs.gov/of/2009/1289/index.html Online_Linkage: http://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: http://pubs.usgs.gov/of/2009/1289/index.html 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 bathymetry 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, S-8-08-SC, is online at . 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: http://pubs.usgs.gov/of/2009/1289/images/usgs2008_clrbathy.pdf Browse_Graphic_File_Description: Illustration of shaded relief bathymetry 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 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. Finally, the processed data are 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 elevation 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 bathymetry 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 = -146.38 >Maximum value = -5.17 >Mean = -61.75 >Standard deviation = 24.39 > >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, >BATHY.TIFF >Imageformat = TIFF >Image type = grayscale >Image colormap = false >Image compressed = false >Image rotate = false > >Image depth = 8 >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 > >BATHY.XYZ >XYZ file (x-coord, y-coord, depth) created from the ESRI grid using the command "GRIDPOINT". > >BATHY.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