Identification_Information: Citation: Citation_Information: Originator: Edward M. Sweeney Publication_Date: 2004 Title: 500 meter bathymetric contours Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Woods Hole, MA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2004/1082/arcgis/shape/contours/500mContour.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 kmē 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: The 500m contour ESRI vector shapefile serves as continental shelf bathymetric reference information for GIS mapping and the viewing of the Gulf of the Farallones sidescan-sonar data set. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2001 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.998260 East_Bounding_Coordinate: -122.664653 North_Bounding_Coordinate: 38.910834 South_Bounding_Coordinate: 37.003126 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: USGS Theme_Keyword: U.S. Geological Survey Theme_Keyword: bathymetry Theme_Keyword: Geographic Information Systems Theme_Keyword: CMGP Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: GIS Theme_Keyword: Geographic Information Systems Theme_Keyword: field activity identifier F9-89-NC Theme_Keyword: field activity serial number 89020 Theme_Keyword: Woods Hole Science Center Theme_Keyword: contours Theme_Keyword: vector Theme_Keyword: shapefile Theme_Keyword: 500 meter 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. Central 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 generated from an ESRI grid of the NGCD Coastal Relief Model. The accuracy of these data are inherited from the Coastal Relief Model. Soundings for each volume of the Coastal Relief model series are compiled from hydrographic surveys conducted by the National Ocean Service (NOS) and from various academic institutions. The surveys were carried out using a variety of sounding methods including SeaBeam 16-beam, 12-kHz swath mapping system (6000- >3000m operating water depths), General Instruments 17-beam, 36-kHz Hydrochart II swath mapping system (5-150m operating water depths), single-beam echosounder (e.g., 3.5 kHz narrow 2 degree beam), and lead-line sounding method. These latter surveys date as far back as the late 1800's. A wide range of navigation methods are also associated with the surveys. Visual navigation is based on three-point sextant fixes, theodolite intersections, and celestial fixes. Electronic navigation involves short to long range positioning systems that run the gamut from Loran-C (0.25 - 5 nm accuracy) to differential GPS (1 m accuracy). Despite the varying sounding and navigation techniques upon which they are based, all of the NOS soundings used in constructing the Coastal Relief Model meet rigorous standards for accuracy. The same standards are employed by the International Hydrographic Office and have remained relatively consistent since the 1800's. The vertical accuracy of the soundings The horizontal accuracy of the soundings is generally 30 m, but it can vary from as fine as 15 m in ports and estuaries to as coarse as 75 m in the offshore areas. Differential GPS has improved this level of accuracy considerably for the most recent survey data. Logical_Consistency_Report: Land elevations within the gridded dataset come from the United States Geological Survey/ National Image Mapping Agency (USGS/NIMA) 1:250,000 or 1 degree DEMs of the states. A description of the USGS/NIMA DEMs and how they were derived can be accessed on the World Wide Web at http://edcwww.cr.usgs.gov/glis/hyper/guide/1_dgr_dem. Our focus, however, is on the bathymetric soundings that are used in constructing the offshore regions of the grids. Soundings for each volume of the Coastal Relief model series are compiled from hydrographic surveys conducted by the National Ocean Service (NOS) and from various academic institutions. The surveys were carried out using a variety of sounding methods including SeaBeam 16-beam, 12-kHz swath mapping system (6000- >3000m operating water depths), General Instruments 17-beam, 36-kHz Hydrochart II swath mapping system (5-150m operating water depths), single-beam echosounder (e.g., 3.5 kHz narrow 2 degree beam), and lead-line sounding method. These latter surveys date as far back as the late 1800's. A wide range of navigation methods are also associated with the surveys. Visual navigation is based on three-point sextant fixes, theodolite intersections, and celestial fixes. Electronic navigation involves short to long range positioning systems that run the gamut from Loran-C (0.25 - 5 nm accuracy) to differential GPS (1 m accuracy). Despite the varying sounding and navigation techniques upon which they are based, all of the NOS soundings used in constructing the Coastal Relief Model meet rigorous standards for accuracy. The same standards are employed by the International Hydrographic Office and have remained relatively consistent since the 1800's. The vertical accuracy of the soundings is 0.3 m in 0 - 20 m of water, 1.0 m in 20 - 100 m of water, and 1% of the water depth in 100 m of water. The horizontal accuracy of the soundings is within a radius of 1.5 mm of the sounding location at the scale at which the soundings are recorded. NOS surveys are plotted at map scales that range from 1/10,000 for harbors and channels to 1/50,000 for open ocean surveys, with 1/20,000 being the most commonly used scale. The horizontal accuracy of the soundings is generally 30 m, but it can vary from as fine as 15 m in ports and estuaries to as coarse as 75 m in the offshore areas. Differential GPS has improved this level of accuracy considerably for the most recent survey data. While the NOS soundings collected since 1965 have been recorded digitally, those collected prior to this time were recorded manually and then used to make hand-drawn bathymetric maps. Approximately 1,550 of these hand-drawn bathymetric maps have been digitized and assimilated into the NOS Hydrographic Database and, subsequently, were used in constructing the many volumes of the gridded dataset. Completeness_Report: These data are complete (see: http://www.ngdc.noaa.gov/mgg/coastal/model.html) Lineage: Source_Information: Source_Citation: Citation_Information: Originator: National Geophysical Data Center (NGDC) Publication_Date: 2001 Title: Coastal Relief Model, Central Pacific Coast, Vol 7 Type_of_Source_Media: CD-ROM Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2001 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NGDC Coastal Relief Model Source_Contribution: The ESRI Grid generated from the NGDC Coastal Relief Model was used to generate the 500 meter bathymetric contours. Process_Step: Process_Description: Contour intervals were created using the Spatial Analysis extension of the ESRI ArcMap program. For visual effectiveness, contours were created between the depths of -500 meters and -3500 meters. 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: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 19 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: 500mcontour Entity_Type_Definition: ESRI Shapefile attribute table 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: ID Attribute_Definition: Internal identification value. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Identification number generated internally. Attribute: Attribute_Label: CONTOUR Attribute_Definition: Contour interval Attribute_Definition_Source: NGDC Coastal Relief Model Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -2500 Range_Domain_Maximum: -200 Attribute_Units_of_Measure: meters 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: 500 meter contours (ESRI Shapefile) 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: 500mcontours.shp Format_Version_Number: ArcGIS 8.3 Format_Information_Content: 500 meter contours - vectors Transfer_Size: 0.219 Fees: none Metadata_Reference_Information: Metadata_Date: 20040528 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Edward M. Sweeney Contact_Organization: U.S. Geological Survey 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