Compressed Digital Sidescan-Sonar Mosaic collected within the Gulf of Farallones

Metadata also available as - [Questions & Answers] - [Parseable text] - [XML]

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Edward M. Sweeney
Publication_Date: 2004
Title:
Compressed Digital Sidescan-Sonar Mosaic collected within the Gulf of Farallones
Geospatial_Data_Presentation_Form: Raster
Publication_Information:
Publication_Place: Woods Hole, MA
Publisher: U.S. Geological Survey
Online_Linkage:
<http://pubs.usgs.gov/of/2004/1082/arcgis/mosaic/farallones_sid.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: Open-File Report
Issue_Identification: 2004-1082
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>
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 were acquired during the sidescan-sonar survey completed in the Gulf of the Farallones in August, 1989 by the U.S. Geological Survey and were used to define the geological framework of the region.
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: -123.398630
East_Bounding_Coordinate: -122.674261
North_Bounding_Coordinate: 37.998062
South_Bounding_Coordinate: 37.550340
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: sonar
Theme_Keyword: Sidescan-sonar
Theme_Keyword: backscatter
Theme_Keyword: USGS
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: field activity identifier F9-89-NC
Theme_Keyword: field activity serial number 89020
Theme_Keyword: Woods Hole Science Center
Theme_Keyword: imagery
Theme_Keyword: AMS-120
Theme_Keyword: seafloor mapping
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
Country: USA
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:
Attribute_Accuracy:
Attribute_Accuracy_Report:
These data were acquired with an AMS-120 (120 kHz) sidescan-sonar system. All data were acquired during one geophysical cruise condcuted in 1989. These data were navigated using GPS and LORAN-C. The horizontal accuracy of these data is roughly +/- 50 meter. Additionally, no layback was estimated for the tow-vehicle. Thus, navigation was based on ship position and not tow-vehicle posistion. Thus, decreasing the horizontal positioning resolution of these data.
Logical_Consistency_Report:
These data were acquired with an AMS-120 (120 kHz) sidescan-sonar system, and processed following an identical procedure.
Completeness_Report: These data are complete.
Lineage:
Process_Step:
Process_Description:
The sidescan-sonar data were acquired using an AMS-120 (120 kHz) sidescan-sonar system. The analog signal from the sidescan-sonar tow vehicle was aquired with and stored on a Triton Technologies, Inc. QMIPS data acquisition system, and then transferred to a Masscomp computer and stored on 8mm 54 MB digital data cartridge tapes. Radiometric corrections and geometric distortions were made using USGS software packages Xsonar and Showimage described in Danforth and others (1991) and Danforth (1997). The sidescan-sonar data were further processed and digitally mosaicked using PCI Geomatica Software and procedures described in Paskevich (1992) resulting in an enhanced, geospatially correct, sidescan-sonar mosaic with 4 meter/pixel resolution. The generated mosaic was exported as a TIFF image, with an associated ESRI world file. Adjustment in contrast levels were then made on the TIFF image file using Adobe Photoshp 6.0. The data were then compressed utilizing LizardTech's Mr.Sid compression alogrithm at a compression ratio of 20:1.
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: 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 x2307
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: esweeney@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 12400
Column_Count: 15900
Vertical_Count: 1
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: 0.999600
Longitude_of_Central_Meridian: -123.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 4.000000
Ordinate_Resolution: 4.000000
Planar_Distance_Units: meters
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: SID Image
Entity_Type_Definition: Sidescan-sonar image in SID format
Entity_Type_Definition_Source: ESRI
Distribution_Information:
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
Resource_Description: Compressed Sidescan-sonar Mosaic of Gulf of Farallones
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
Country: USA
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:
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.8.7 on Mon Jul 19 11:56:32 2004