Backscatter A [CSUMB]--Offshore of Santa Barbara, California

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Peter Dartnell

Originator: Rikk G. Kvitek

Originator: Eleyne L. Phillips

Originator: Guy R. Cochrane

Publication_Date: 2013

Title: Backscatter A [CSUMB]--Offshore of Santa Barbara, California

Edition: 1.0

Geospatial_Data_Presentation_Form: GeoTiff

Larger_Work_Citation:

Citation_Information:

Originator: Samuel Y. Johnson

Originator: Peter Dartnell

Originator: Guy R. Cochrane

Originator: Nadine E. Golden

Originator: Eleyne L. Phillips

Originator: Andrew C. Ritchie

Originator: H. Gary Greene

Originator: Lisa M. Krigsman

Originator: Rikk G. Kvitek

Originator: Bryan E. Dieter

Originator: Charles A. Endris

Originator: Gordon G. Seitz

Originator: Ray W. Sliter

Originator: Mercedes D. Erdey

Originator: Carlos I. Gutierrez

Originator: Florence L. Wong

Originator: Mary M. Yoklavich

Originator: Amy E. Draut

Originator: Patrick E. Hart

Originator: James E. Conrad

Originator: Susan A. Cochran

Publication_Date: 2013

Title:

California State Waters Map Series--Offshore of Santa Barbara, California

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: Scientific Investigations Map

Issue_Identification: SIM 3281

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Online_Linkage: <https://dx.doi.org/10.3133/sim3281>

Online_Linkage: <https://pubs.usgs.gov/sim/3281/>

Larger_Work_Citation:

Citation_Information:

Originator: Nadine E. Golden

Publication_Date: 2013

Title: California State Waters Map Series Data Catalog

Geospatial_Data_Presentation_Form: database

Series_Information:

Series_Name: Data Series

Issue_Identification: DS 781

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Online_Linkage: <https://pubs.usgs.gov/ds/781/>

Description:

Abstract:

This part of SIM 3281 presents data for part of the acoustic-backscatter map (see sheet 3, SIM 3281) of the Offshore of Santa Barbara map area, California. The raster data file is included in "BackscatterA_CSUMB_OffshoreSantaBarbara.zip," which is accessible from <https://pubs.usgs.gov/ds/781/OffshoreSantaBarbara/data_catalog_OffshoreSantaBarbara.html>. The acoustic-backscatter map of the Offshore of Santa Barbara map area, California, was generated from backscatter data collected by California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB) and by the U.S. Geological Survey (USGS). These metadata describe the acoustic-backscatter data collected by CSUMB and reprocessed by the USGS. See "BackscatterB_USGS_OffshoreSantaBarbara_metadata.txt" metadata for a description of the acoustic-backscatter data collected by the USGS. Most of the offshore area was mapped by CSUMB in the summer of 2007, using a 244-kHz Reson 8101 multibeam echosounder. Within the acoustic-backscatter imagery, brighter tones indicate higher backscatter intensity, and darker tones indicate lower backscatter intensity. The intensity represents a complex interaction between the acoustic pulse and the seafloor, as well as characteristics within the shallow subsurface, providing a general indication of seafloor texture and sediment type. Backscatter intensity depends on the acoustic source level; the frequency used to image the seafloor; the grazing angle; the composition and character of the seafloor, including grain size, water content, bulk density, and seafloor roughness; and some biological cover. Harder and rougher bottom types such as rocky outcrops or coarse sediment typically return stronger intensities (high backscatter, lighter tones), whereas softer bottom types such as fine sediment return weaker intensities (low backscatter, darker tones).

Purpose:

These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 2007

Ending_Date: 2007

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -119.81

East_Bounding_Coordinate: -119.62

North_Bounding_Coordinate: 34.49

South_Bounding_Coordinate: 34.32

Keywords:

Theme:

Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)

Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Bathymetry

Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Seafloor Topography

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: CSMP

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: Santa Barbara

Place_Keyword: Pacific Ocean

Place_Keyword: California

Access_Constraints: None

Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) and California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB). 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, 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

Browse_Graphic:

Browse_Graphic_File_Name: <BackscatterA(CSUMB)_OffshoreSantaBarbara_forDataCatalog>

Browse_Graphic_File_Description: Acoustic backscatter imagery of offshore Santa Barbara.

Browse_Graphic_File_Type: GIF Offshore Santa Barbara

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:

Estimated to be no less than 2 m, owing to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: Not applicable

Lineage:

Process_Step:

Process_Description:

CSUMB acoustic-backscatter data were collected in the summer of 2007, using a 244-kHz Reson 8101 multibeam echosounder. During the CSUMB mapping mission, an Applanix positioning and motion compensation system (POS/MV) was used to accurately position the vessel during data collection, and it also accounted for vessel motion such as heave, pitch, and roll (position accuracy, +/-2 m; pitch, roll, and heading accuracy, +/-0.02 degrees; heave accuracy, +/-5 percent, or 5 cm). NavCom 2050 GPS receiver (CNAV) data were used to account for tidal-cycle fluctuations, and sound-velocity profiles were collected with an Applied Microsystems (AM) SVPlus sound velocimeter. Soundings were corrected for vessel motion using the Applanix POS/MV data, for variations in water-column sound velocity using the AM SVPlus data, and for variations in water height (tides) using vertical-position data from the CNAV receiver.

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Carrie Bretz

Contact_Organization: Seafloor Mapping Lab, California State University Monterey Bay

Contact_Position: Projects Manager, GIS; Metadata Supervisor

Contact_Address:

Address_Type: mailing and physical address

Address: 100 Campus Center, Bldg 13

City: Seaside

State_or_Province: CA

Postal_Code: 93955

Country: USA

Contact_Voice_Telephone: (831) 582-4197

Contact_Electronic_Mail_Address: carrie_bretz@csumb.edu

Process_Step:

Process_Description:

USGS received original Caris HIPS/SIPS projects from CSUMB for CSUMB survey blocks A-H. Backscatter data were postprocessed by the USGS using CARIS7.0/Geocoder software. Geobars were created for each survey line using the beam-averaging engine. Intensities were radiometrically corrected (including despeckling and angle-varying gain adjustments), and the position of each acoustic sample was geometrically corrected for slant range on a line-by-line basis. The contrast and brightness of some geobars were adjusted to better match the surrounding geobars. Individual geobars were mosaicked together at 2-m resolution using the auto-seam method. The mosaics were then exported from CARIS as georeferenced TIFF images, imported into a GIS, and converted to GRIDS and clipped to the Offshore of Santa Barbara map boundary.

Process_Date: 2009

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: WGS84

Ellipsoid_Name: NAVD88

Semi-major_Axis: 6378137.00 meters

Denominator_of_Flattening_Ratio: 298.257223563

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

The complete 2007 backscatter data were originally archived as an ESRI grid with the following attributes:

Cell size = 2.0
Number of rows = 8960
Number of columns = 8960

Data type = floating point

Boundary
Xmin = 241390
Xmax = 259310
Ymin = 3801510
Ymax = 3819430

Statistics
Minimum value = 0
Maximum value = 254
Mean = 116.65
Standard deviation = 29.48

Coordinate system description
Projection  UTM
Zone  11
Datum  WGS84
Units  meter

Entity_and_Attribute_Detail_Citation: none

Metadata_Reference_Information:

Metadata_Date: 2013

Metadata_Review_Date: 2013

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