Tracklines of Sidescan-Sonar Survey conducted within Gulf of Farallones, 1989, by the U.S. Geological Survey

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: Edward M. Sweeney

Publication_Date: 2004

Title:

Tracklines of Sidescan-Sonar Survey conducted within Gulf of Farallones, 1989, by the U.S. Geological Survey

Geospatial_Data_Presentation_Form: Vector

Publication_Information:

Publication_Place:

U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA

Publisher: U.S. Geological Survey

Online_Linkage:

<http://pubs.usgs.gov/of/2004/1082/arcgis/shape//tracklines/Tracklines.zip>

Larger_Work_Citation:

Citation_Information:

Originator: Edward M. Sweeney

Originator: William W. Danforth

Originator: Herman A. Karl

Originator: Thomas F. O'Brien

Originator: William C. Schwab

Publication_Date: 2004

Title: The Gulf of Farallones: Sidescan-Sonar Imagery

Series_Information:

Series_Name: USGS Open-File Report

Issue_Identification: 2004-1082

Publication_Information:

Publication_Place: USGS, Woods Hole Science Center, Woods Hole, MA

Publisher: USGS

Online_Linkage: <http://pubs.usgs.gov/of/2004/1082>

Description:

Abstract:

In 1989, the U.S. Geological Survey (USGS) began a major geologic and oceanographic investigation of the Gulf of the Farallones continental shelf system, designed to evaluate and monitor human impacts on the marine environment (Karl and others, 2002). The study region is located off the central California coast, adjacent to San Francisco Bay and encompasses the Gulf of the Farallones National Marine Sanctuary. Geologic mapping of this area included the use of various remote sensing and sampling techniques such as sub-bottom profiling, sidescan-sonar and bathymetric mapping, gravity core and grab sampling, and photography. These data were used to define the surficial sediment distribution, underlying structure and sea floor morphology of the study area. The primary focus of this report is to present a georeferenced, digital sidescan-sonar mosaic of the study region. The sidescan-sonar data were acquired with the AMS-120 (120kHz) sidescan-sonar system during USGS cruise F9-89-NC. The dataset covers approximately 1000 km² of the continental shelf between Point Reyes, California and Half Moon Bay, California, extending west to the continental shelf break near the Farallon Islands. The sidescan-sonar mosaic displays a heterogenous sea-floor environment, containing outcropping rock, ripples, dunes, lineations and depressions, as well as flat, featureless sea floor (Karl and others, 2002). These data, along with sub-bottom interpretation and ground truth data define the geologic framework of the region. The sidescan-sonar mosaic can be used with supplemental remote sensing and sampling data as a base for future research, helping to define the local current regime and predominant sediment transport directions and forcing conditions within the Gulf of Farallones.

Purpose:

These data represent the sidescan-sonar trackline navigation data during the geophysical survey in the Gulf of the Farallones off the coast of central California.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19890802

Ending_Date: 19890815

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -123.383570

East_Bounding_Coordinate: -122.688740

North_Bounding_Coordinate: 37.977070

South_Bounding_Coordinate: 37.587810

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: Sidescan-Sonar

Theme_Keyword: AMS-120

Theme_Keyword: USGS

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: Woods Hole Science Center

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: CMGP

Theme_Keyword: trackline navigation

Theme_Keyword: AMS-120

Theme_Keyword: seafloor mapping

Theme_Keyword: field activity identifier F9-89-NC

Theme_Keyword: field activity serial number 89020

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Farallones

Place_Keyword: Gulf of the Farallones

Place_Keyword: California

Place_Keyword: U.S. West Coast

Place_Keyword: U.S. Pacific Coast

Place_Keyword: North America

Place_Keyword: Pacific Ocean

Place_Keyword: United States

Place_Keyword: Half Moon Bay

Place_Keyword: Point Reyes

Place_Keyword: Farallon Islands

Place_Keyword: Bodega Bay

Place_Keyword: San Francisco

Access_Constraints: None

Use_Constraints:

Public domain data from the U.S. government is freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of this dataset.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Edward M. Sweeney

Contact_Organization: U.S. Geological Survey

Contact_Position: Research Assistant

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543

Contact_Voice_Telephone: (508) 548-8700 x2307

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: esweeney@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 8.3.0.800

Data_Quality_Information:

Logical_Consistency_Report:

These data represent the sidescan-sonar tracklines conducted during a geophysical cruise within the Gulf of Farallones in 1989 by the U.S. Geological Survey. These data were navigated by GPS and LORAN-C. For real time positioning, the primary system was chosen either manually by the navigator or selected automatically by computer. Tracklines were within 100m of preplotted tracks when using GPD and LORAN-C and within a few meters when navigating under the Del Norte system.

Completeness_Report:

These data represent the sidescan-sonar tracklines conducted during a geophysical cruise within the Gulf of Farallones in 1989 by the U.S. Geological Survey.

Lineage:

Process_Step:

Process_Description:

Navigation data was acquired using three systems: (1) Global Positioning System (GPS); (2) LORAN-C; and (3) shore-based, line-of-sight transponder net (Del Norte system). For real time positioning, the primary system was chosen either manually by the navigator or selected automatically by computer.

The navigation is reformatted into a comma-delimited ArcView Ungenerate text format. The file is then imported into ArcView, and a vector line shapefile is generated. The line numbers for each trackline are stored in an ASCII file listing unique track ID and line number. This file is imported into ArcView and ArcMap as a table. The file is then joined to the line shapefile by the unique track ID. The table for the trackline file is then edited, a new field created and the line number information is written to this new field. After writing the line number information to the trackline shapefile, the table join is removed, and the file is saved. This permanently saves the line number with the corresponding trackline.

Process_Date: 2004

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Edward M. Sweeney

Contact_Organization: U.S. Geological Survey

Contact_Position: Research Assistant

Contact_Address:

Address_Type: Physical

Address: 384 Woods Hole Road

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543

Country: USA

Contact_Voice_Telephone: 508-548-8700 x2307

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: esweeney@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 358

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000089992

Longitude_Resolution: 0.000089992

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984

Ellipsoid_Name: WGS_1984

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Tracklines

Entity_Type_Definition: ESRI ArcGIS 8.3 vector shapefile

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: LineNumber

Attribute_Definition: Internal Definition

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Internal identification value

Distribution_Information:

Resource_Description: Sidescan-sonar Tracklines (ESRI Shapefile)

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Nancy Soderberg

Contact_Organization: U.S. Geological Survey

Contact_Position: Data Librarian

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543

Country: USA

Contact_Voice_Telephone: (508) 548-8700 x2275

Contact_Facsimile_Telephone: (580)457-2313

Contact_Electronic_Mail_Address: nsoderberg@usgs.gov

Distribution_Liability:

Although this data set and its lineage have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data or its related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related items. Users must assume responsibility for the proper use of these data. The data should not be used at resolutions for which they are not intended. The data have not been reviewed for conformity with U.S. Geological Survey editorial standards, or the North American Strigraphic code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government.

Metadata_Reference_Information:

Metadata_Date: 20040407

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Edward M. Sweeney

Contact_Organization: U.S. Geological Survey

Contact_Position: Research Assistant

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543

Contact_Voice_Telephone: (508) 548-8700 x2307

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: esweeney@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile