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2005 single beam bathymetry data collected in South San Francisco Bay, California

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Metadata:


Identification_Information:

Citation:
Citation_Information:
Originator: Bruce Jaffe
Publication_Date: 2007
Title:
2005 single beam bathymetry data collected in South San Francisco Bay, California
Geospatial_Data_Presentation_Form: tabular digital data

Larger_Work_Citation:
Citation_Information:
Originator:
Foxgrover, A., Jaffe, B., Hovis, G., Martin, C., Hubbard, J., Samant, M., and Sullivan, S.
Publication_Date: 2007
Title: 2005 Hydrographic Survey of South San Francisco Bay, California
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2007-1169
Publication_Information:
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey
Online_Linkage: <http://pubs.wr.usgs.gov/of/2007/1169>

Description:
Abstract:
XYZ ASCII format data generated from the 2005 single beam acoustic bathymetric survey of South San Francisco Bay, CA. Z-values provided relative to the North American Vertical Datum of 1988 (NAVD88) and to Mean Lower Low Water (MLLW) of the 1983-2001 national tidal datum epoch where possible. Funding provided by the California Coastal Conservancy and survey collected by Sea Surveyor, Inc. of Benicia, CA.

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 bathymetry data of South San Francisco Bay, CA.

Supplemental_Information:
Bounding ccordinates for ivdividual zones are as follows.

Zone 31  West: -122.24, East: -122.18, North: 37.70, South: 37.67
Zone 33  West: -122.31, East: -122.24, North: 37.67, South: 37.62
Zone 34  West: -122.25, East: -122.17, North: 37.69, South: 37.64
Zone 35  West: -122.28, East: -122.16, North: 37.67, South: 37.61
Zone 36  West: -122.33, East: -122.25, North: 37.64, South: 37.59
Zone 37  West: -122.31, East: -122.15, North: 37.66, South: 37.57
Zone 38  West: -122.26, East: -122.15, North: 37.62, South: 37.55
Zone 39  West: -122.23, East: -122.14, North: 37.60, South: 37.53
Zone 40  West: -122.20, East: -122.12, North: 37.57, South: 37.51
Zone 42  West: -122.17, East: -122.11, North: 37.55, South: 37.49
Zone 43  West: -122.13, East: -122.09, North: 37.52, South: 37.47
Zone 44  West: -122.12, East: -122.05, North: 37.50, South: 37.45
Zone 46  West: -122.06, East: -122.03, North: 37.46, South: 37.45
Zone 47  West: -122.34, East: -122.92, North: 37.47, South: 37.46
Zone 48  West: -122.01, East: -121.98, North: 37.47, South: 37.46
Zone 49  West: -121.98, East: -121.96, North: 37.47, South: 37.47
Zone 50  West: -121.98, East: -121.97, North: 37.46, South: 37.46
Zone 51  West: -121.96, East: -121.95, North: 37.48, South: 37.47
Zone 52  West: -121.97, East: -121.95, North: 37.47, South: 37.46
Zone 53  West: -121.97, East: -121.96, North: 37.46, South: 37.45
Zone 54  West: -121.97, East: -122.00, North: 37.45, South: 37.44
Zone 55  West: -122.02, East: -122.01, North: 37.46, South: 37.45
Zone 56  West: -122.00, East: -121.99, North: 37.45, South: 37.43
Zone 57  West: -121.99, East: -121.98, North: 37.43, South: 37.42
Zone Upper Mud  West: -121.95, East: -121.93, North: 37.47, South: 37.45
Zone Upper Coyote  West: -121.95, East: -121.95, North: 37.48, South: 37.48
Zone Upper Artesian  West: -121.96, East: -121.96, North: 37.44, South: 37.44
Zone QC Lines  West: -122.31, East: -122.12, North: 37.69, South: 37.51
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050110
Ending_Date: 20050405
Currentness_Reference: publication date

Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.34
East_Bounding_Coordinate: -121.92
North_Bounding_Coordinate: 37.70
South_Bounding_Coordinate: 37.42

Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Marine Geology
Theme_Keyword: Bathymetry
Theme_Keyword: Hydrographic Survey
Theme_Keyword: Water Depth
Theme_Keyword: Bay Floor Topography
Theme_Keyword: elevation
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program

Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans and estuaries
Theme_Keyword: geoscientificinformation
Theme_Keyword: elevation

Theme:
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY
Theme_Keyword: EARTH SCIENCE > OCEANS > COASTAL PROCESSES
Theme_Keyword:
INSTRUMENTS > EARTH REMOTE SENSING > ACTIVE REMOTE SENSING > PROFILERS/SOUNDERS > ACCOUSTIC SOUNDERS

Place:
Place_Keyword_Thesaurus: None
Place_Keyword: South San Francisco Bay
Place_Keyword: CA
Place_Keyword: Northern California
Place_Keyword: USA

Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: San Francisco Bay
Place_Keyword: California

Access_Constraints: None

Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) and the California Coastal Conservancy as the source of this information. USGS-authored or produced data and information are in the public domain.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bruce Jaffe
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Physical Oceanographer
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) 427-4742
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: bjaffe@usgs.gov

Browse_Graphic:
Browse_Graphic_File_Name:
<http://walrus.wr.usgs.gov/infobank/b/b105sf/html/b-1-05-sf.nav.html>
Browse_Graphic_File_Description: Image showing location and extent of B-1-05-SF data.
Browse_Graphic_File_Type: GIF

Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey, Coastal and Marine Geology Program
Publication_Date: 2007
Title: InfoBank
Online_Linkage:
<http://walrus.wr.usgs.gov/infobank/b/b105sf/html/b-1-05-sf.meta.html>


Data_Quality_Information:

Logical_Consistency_Report:
To make the soundings comparable to historical data, water depths were measured and corrected for tide using the same methods as used during the more recent of the historical surveys of South San Francisco Bay. Soundings were collected using a single-beam, survey-grade depthfinder having the same frequency and beam-width as used during the more recent of the historical surveys. Soundings were corrected to the MLLW vertical datum using tide data measured at the same location and reduced by the same organization (NOAA) as historical surveys.

Soundings from the hydrographic survey are in meters referenced to two separate vertical datum, including MLLW and NAVD-88. USGS will compare soundings referenced to MLLW to historical NOS surveys of South San Francisco Bay, and merge soundings referenced to NAVD-88 with the May 2004 LIDAR topographic data to create a terrain model of existing land surface elevation and bay bathymetry.

Completeness_Report:
Soundings were collected during periods of high tide in order to optimize Òbank-to-bankÓ coverage of South Bay tidal flats, and provide maximum overlap with the aerial topographic LIDAR data collected months earlier during periods of low tide.

Soundings were collected across South San Francisco Bay along tracklines spaced at nominal 100m intervals and oriented in a southwest-northeast direction (perpendicular to the general bathymetric contour of the seafloor). Survey tracklines were divided into tide zones defined by NOAA (2006), with 100m overlap into adjacent zones. Dividing the tracklines into tide zone simplified processing the soundings and provided a QC check in the overlap area around tide zone boundaries. Unless obstructions were encountered, soundings near the shoreline extend to elevation +0.3m MLLW or higher. When practical, soundings were collected around obstructions to complete sounding lines. Overlap between survey areas and cross-lines (tielines) are provided for quality-control assessment of the soundings. Soundings were collected during all stages of the tide, provided that sufficient water depth was available for safe navigation. Areas shallower than Ð1m MLLW were surveyed during periods of extreme high tides when the water surface elevation is +1.75m MLLW or higher. Areas deeper than Ð3m MLLW were surveyed during all stages of the tide (high and low), but always during periods of ÒneapÓ tides when the water surface elevation changes less than 1.25m between high and low tides. Survey lines terminated early because of shallow water during low or moderate tides were re-surveyed during extreme high tides in order to collect soundings as far upland as possible. For QC purposes, survey lines terminated early at low tide are re-surveyed at high tide with a minimum 100m overlap.

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: +/- 3 meters
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
in the bay, +/- 6 cm; in the sloughs and creeks, +/- 15 cm. Depths reduced to MLLW vertical datum.

Lineage:
Process_Step:
Process_Description:
The single beam bathymetric data was collected using an INNERSPACE Model 455 survey-grade depthfinder with 3-degree, 200kHz transducer. The depthfinder collects 20 soundings/second typically resulting in a nominal spacing of 0.15m along trackline. Tracklines are oriented perpendicularly to the slope of the bay floor and spaced 100 m apart. The data were reduced to the Mean Lower Low Water (MLLW) datum of the 1983 to 2001 epoch using a tidal reduction scheme created by NOAA consisting of specific time and range corrections for discrete zones within South SF Bay. After reducing the soundings to a common vertical datum, they were thinned to 1 m spacing along tracklines. (Reduction methodologies for soundings collected in Coyote Creek and the adjacent sloughs varied, please see details contained in the body of OF-1169). NOAA also calculated offset values for the difference between the tidal datum of MLLW and the geodetic datum of NAVD88. This offset was calculated for all zones except 51-54. All soundings except those in zones 51-54 are available relative to MLLW and soundings for the entire survey are available relative to NAVD88. Seperate X,Y,Z ASCII files for each vertical datum are provided.
Process_Date: 20070504
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bruce Jaffe
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Physical Oceanographer
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) 427-4742
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: bjaffe@usgs.gov


Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point


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: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000064
Ordinate_Resolution: 0.000064
Planar_Distance_Units: meters

Geodetic_Model:
Horizontal_Datum_Name: NAD83
Ellipsoid_Name: GRS80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222


Entity_and_Attribute_Information:

Overview_Description:
Entity_and_Attribute_Overview:

Sample of Bathymetry XYZ ASCII file
X(UTM, m),   Y(UTM, m),    Depth(m, MLLW)

571247.445,  4172178.538,  -0.213
571246.972,  4172179.416,  -0.213
571246.452,  4172180.270,  -0.274
571245.662,  4172180.879,  -0.305
571244.849,  4172181.458,  -0.335
571243.978,  4172181.944,  -0.335
571243.130,  4172182.460,  -0.396
571242.222,  4172182.875,  -0.427
571241.337,  4172183.342,  -0.457
571240.447,  4172183.797,  -0.518
Entity_and_Attribute_Detail_Citation: none


Distribution_Information:

Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Person: Bruce Jaffe
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) 427-4742

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, US DOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.


Metadata_Reference_Information:

Metadata_Date: 20070504

Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Amy Foxgrover
Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology
Contact_Position: Geographer
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) 427-4743
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: afoxgrover@usgs.gov

Metadata_Standard_Name:
Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998


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