October 2014 bathymetry (NAVD88) of Coyote Creek and Alviso Slough, South San Francisco Bay, California

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC), Santa Cruz, CA.
Publication_Date: 2015
Title:
October 2014 bathymetry (NAVD88) of Coyote Creek and Alviso Slough, South San Francisco Bay, California
Geospatial_Data_Presentation_Form: raster digital data
Larger_Work_Citation:
Citation_Information:
Originator:
U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC), Santa Cruz, CA.
Publication_Date: 2015
Title:
Bathymetry and Digital Elevation Models of Coyote Creek and Alviso Slough, South San Francisco Bay, California (Version 3, 2015)
Edition: Version 3.0
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OF2011-1315
Online_Linkage:
https://pubs.usgs.gov/of/2011/131, https://dx.doi.org/10.3133/ofr20111315
Description:
Abstract:
1-m resolution bathymetry collected in Coyote Creek and Alviso Slough in October 2014.
Projection = UTM, zone 10 in meters, Horizontal Datum = NAD83 (NSRS2007), Vertical Datum = NAVD88, all units in meters.
The surveys extend east from Calaveras Point along Coyote Creek to approximately 2 km west of the railroad bridge, along Alviso Slough to the town of Alviso (just over 7 km), and along the 3.7 km of Guadalupe Slough closest to San Fancisco Bay, California.
Purpose:
To monitor bathymetric change as the South Bay Salt Pond Restoration Project progresses (http://www.southbayrestoration.org).
Supplemental_Information:
USGS Field Activity 2014-670-FA <http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-670-FA>
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20141023
Ending_Date: 20141024

Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.060187436
East_Bounding_Coordinate: -121.974560855
North_Bounding_Coordinate: 37.4706742088
South_Bounding_Coordinate: 37.4231662547
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: geoscientificInformation
Theme_Keyword: inlandWaters
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword: OCEANS > BATHYMETRY > SEAFLOOR TOPOGRAPHY > BATHYMETRY
Theme:
Theme_Keyword_Thesaurus: GCMD INSTRUMENT PARAMETERS
Theme_Keyword: SIDE-SCAN SONAR
Theme_Keyword: GPS > Global Positioning System
Theme_Keyword: LIDAR > Light Detection and Ranging
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of California
Place_Keyword: San Francisco Bay
Place_Keyword: Alameda County
Place_Keyword: Santa Clara County
Place_Keyword: Alviso
Place_Keyword: Coyote Creek
Place_Keyword: Alviso Slough
Place_Keyword: Guadalupe Slough
Access_Constraints:
If physical samples or materials are available, constraints on their on-site access are described in "WR CMG Sample Distribution Policy" at URL: http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html
Use_Constraints:
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_Organization_Primary:
Contact_Organization: USGS Pacific Coastal and Marine Science Center
Contact_Person: Amy Foxgrover
Contact_Position: Geographer
Contact_Address:
Address_Type: physical address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 460-7561
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: afoxgrover@usgs.gov
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
This bathymetric data has not been independently verified for accuracy.
Logical_Consistency_Report:
All bathymetric values are derived from the same instruments and processing workflow.
Completeness_Report:
The raw bathymetry data was filtered in SEA Swath Processor and imported into CARIS HIPS and SIPS for post-processing. Within CARIS a swath angle BASE (Bathymetric with Associated Statistical Error) surface was created at 1 m resolution and the subset editor used to manually eliminate any remaining outliers or artifacts. The average depth within each 1 by 1 m cell was exported as an ASCII text file and imported into Surfer for interpolation using a linear kriging algorithm with a 1-simga nugget of 0.05 m and a 2 by 2 m search radius. The resultant grid was exported to ESRI ArcMap software for display.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Uncertainty in the horizontal position of each sounding is a function of the total uncertainty propagated through each of the following component instruments: 1) base station GPS, 2) vessel GPS, 3) intertial motion unit (IMU), 4) water sound velocity model, and 5) beam spreading in the water column. Assuming no systematic errors in the measurement instruments themselves, beam spreading is the dominate source of positional uncertainty. The 1-degree sonar beam of the SWATHplus-M results in horizontal uncertainty ranging from 0.10 m at 10 m slant range, to about 0.45 m at 50 m slant range.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
After filtering the data to remove obvious outliers, the standard deviation of the remaining sounding elevations was calculated for each 1 m by 1 m cell (each containing 19 soundings on average) in CARIS. The mean of the standard deviation for all cells in the survey is 0.05 m and 97% of the cells in the data set have a standard deviation of less than 0.15 m.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey, Coastal and Marine Geology Program
Publication_Date: 2015
Title: USGS CMG Field Activity 2014-670-FA
Geospatial_Data_Presentation_Form: raster digital data
Online_Linkage: <http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-670-FA>
Type_of_Source_Media: online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20141023
Ending_Date: 20141024
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: 2014-670-FA
Source_Contribution:
This 2014 field activity collected bathymetric data in San Francisco Bay.
Process_Step:
Process_Description:
Sonar Data Collection
The bathymetric surveys were conducted using a 234.5 kHz SEA (Systems Engineering & Assessment Ltd) SWATHplus-M phase-differencing sidescan sonar. The sonar was pole-mounted on the 34-foot USGS mapping vessel R/V Parke Snavely, and affixed to a hull brace. GPS position data were passed through a POS MV intertial measurement unit (IMU) to the sonar hardware and data collection software. Sonar heads, GPS antennae, and the IMU were surveyed in place to a common reference frame with a Geodimeter 640 Total Station. The R/V Snavely was outfitted with three networked workstations and a navigation computer for use by the captain and survey crew for data collection and initial processing.
Process_Date: 2014
Process_Step:
Process_Description:
Vessel Position and Attitude
Vessel and position attitude measured using an Applanix Position and Orientation System for Marine Vessels (POS MV). The POS MV utilizes Global Navigation Satellite System (GNSS) data in combination with angular rate and acceleration data from the IMU and heading data from the GPS Azimuth Measurement Systems (GAMS) to produce accurate position and orientation information through a virtual network of base stations. As opposed to receiving high-accuracy RTK corrections in real time, the POS records raw inertial and GNSS data while surveying which is later refined through post processing to incorporate publicly available GPS data from nearby base stations. During post processing the POS M/V data is run through POSPac software to produce a Smoothed Best Estimate of Trajectory (SBET) file which is then imported back into Swath Processor to produce high-accuracy positions relative to the WGS84 ellipsoid. The RMS results from our POS MV surveys show positional errors of less than 5cm in X, Y, and Z.
Process_Date: 2014
Process_Step:
Process_Description:
Sound Velocity Measurements
Sound velocity measurements were collected continuously with an Applied Micro Systems Micro SV deployed on the transducer frame for real-time sound velocity adjustments at the transducer-water interface. The Micro SV is accurate to +/- 0.03 m/s. In addition, sound velocity profiles (SVP) were collected with an Applied Micro Systems, SvPlus 3472. This instrument provides time-of-flight sound-velocity measurements by using invar rods with a sound-velocity accuracy of +/- 0.06 m/s, pressure measured by a semiconductor bridge strain gauge to an accuracy of 0.15 percent (Full Scale) and temperature measured by thermistor to an accuracy of 0.05 degrees Celsius (Applied Microsystems Ltd., 2005).
Process_Date: 2014
Process_Step:
Process_Description:
Sonar Sounding Processing
GPS data and measurements of vessel motion are combined in the POS MV hardware to produce a high-precision vessel attitude packet. This packet is transmitted to the Swath Processor acquisition software in real-time and combined with instantaneous sound velocity measurements at the transducer head before each ping. Up to 20 pings per second are transmitted with each ping consisting of 2048 samples per side (port and starboard). The returned samples are projected to the seafloor using a ray-tracing algorithm working with the previously measured sound velocity profiles in SEA Swath Processor (version 3.7.17). A series of statistical filters are applied to the raw samples that isolate the seafloor returns from other uninteresting targets in the water column. Finally, the processed data is stored line-by-line in both raw (.sxr) and processed (.sxp) trackline files.
Process_Date: 2014
Process_Step:
Process_Description:
Digital Elevation Model Production
The raw bathymetry data was filtered in SEA Swath Processor (version 3.7.17) and imported into CARIS HIPS and SIPS (version 8.1) for post-processing. Within CARIS a swath angle BASE (Bathymetric with Associated Statistical Error) surface was created at 1 m resolution and the subset editor used to manually eliminate any remaining outliers or artifacts. The average depth within each 1 by 1 m cell was exported as an ASCII text file and imported into Surfer (version 10) for interpolation using a linear kriging algorithm with a 1-simga nugget of 0.05 m and a 2 by 2 m search radius. The resultant grid was exported to ESRI ArcMap (version 10.2.1) for display and further analyses. The entire survey was shoaled by 7 cm to account for a combination of biases resulting from changes in the boat instrumentation and configurations that occured since the initial survey was collected in 2010.
Process_Date: 2014
Process_Step:
Process_Description:
Vertical Datum Transformations
To convert the bathymetry from WGS84 ellipsoid heights to NAVD88 orthometric heights the data were first transformed from WGS84(ITRF2000) to the NAD83(CORS96) ellipsoid using a 14-point Helmert transformation described by Soler and Snay (2004) using the command line tool CS2CS in the Proj4 library (http://trac.osgeo.org/proj/). A fixed Geoid09 offset of -32.63 m was then applied to convert the NAD83 ellipsoid heights to orthometric heights NAD83(CORS96)/NAVD88.
Process_Date: 2014
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: raster
Raster_Object_Information:
Raster_Object_Type: grid cell
Row_Count: 5061
Column_Count: 6914
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: 0.9996
Longitude_of_Central_Meridian: -123
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983 (NSRS2007)
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum 1988 (NAVD88)
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method: Attribute values
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Altitude
Entity_Type_Definition:
Orthometric Altitude (elevation) relative to NAVD88 in meters. Values are positive up.
Entity_Type_Definition_Source: USGS Open-File Report: 2011-1315
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center (PCMSC)
Contact_Person: Amy Foxgrover
Contact_Address:
Address_Type: mailing and physical address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: US
Contact_Voice_Telephone: 831-460-7561
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: afoxgrover@usgs.gov
Resource_Description: Downloadable Data
Distribution_Liability:
This information is not intended for navigational purposes.
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.
Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Standard_Order_Process:
Digital_Form:
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Format_Version_Number: 1.0
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Transfer_Size: 50
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://pubs.usgs.gov/of/2011/1315/, https://dx.doi.org/10.3133/ofr20111315
Fees: No cost
Metadata_Reference_Information:
Metadata_Date: 20150623
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Amy Foxgrover
Contact_Address:
Address_Type: mailing address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: California
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 460-7561
Contact_Electronic_Mail_Address: afoxgrover@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.32 on Fri Sep 04 20:19:52 2015