2010 Bathymetric Survey and DEM of Corte Madera Bay, California
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator:
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U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC), Santa Cruz, CA.
- Publication_Date: 2011
- Title: 2010 Bathymetric Survey and DEM of Corte Madera Bay, California
- Geospatial_Data_Presentation_Form: raster digital data
- Series_Information:
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- Series_Name: U.S. Geological Survey Open-File Report
- Issue_Identification: OF2011-1217
- Online_Linkage: <https://pubs.usgs.gov/of/2011/1217>
- Description:
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- Abstract:
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Raw 1-m resolution bathymetry collected in Corte Madera Bay in the spring of 2010.
Reference Frame = WGS84(G1150) Vertical Datum = WGS84(G1150) all units in meters.
The 1-m resolution BASE surface was created in CARIS using a swath angle weighting
scheme where higher weight is given to soundings from the inner part of a swath than
to outer beams from adjacent track lines. This data set is the original bathymetry
with datum conversions applied. No additional smoothing or interpolation has been
applied so some small-scale ripple features are distinguishable on the bed floor,
but gaps exist near nadir and between track lines.
- Purpose:
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Bathymetry of Corte Madera Bay collected for use in wave-attenuation studies and sea level rise analyses.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Range_of_Dates/Times:
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- Beginning_Date: 20100126
- Ending_Date: 20100330
- Currentness_Reference: ground condition
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -122.504712
- East_Bounding_Coordinate: -122.458596
- North_Bounding_Coordinate: 37.943068
- South_Bounding_Coordinate: 37.905329
- Keywords:
-
- Theme:
-
- Theme_Keyword_Thesaurus: ISO 19115 Topic Category
- Theme_Keyword: Elevation
- Theme_Keyword: Bathymetry
- Place:
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- Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
- Place_Keyword: USA
- Place_Keyword: State of California
- Place_Keyword: San Francisco Bay
- Place_Keyword: Marin County
- Place_Keyword: Corte Madera
- 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:
-
Not suitable for navigation.
Read and fully comprehend the metadata prior to data use.
Acknowledge the U.S. Geological Survey (USGS), the Originator, when using the data set as a source. Any
use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the
U.S. Government.
Share data products developed using the source data set with the Originator.
Data should not be used beyond the limits of the source scale.
This information is not intended for navigational purposes.
The data set is NOT a survey document and should not be utilized as such. Some USGS information
accessed through this means may be preliminary in nature and presented without the approval of the Director
of the USGS.
This information is provided with the understanding that it is not guaranteed to be correct or complete and
conclusions drawn from such information are the responsibility of the user.
- Point_of_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: USGS Pacific Coastal and Marine Science Center
- Contact_Person: David P Finlayson
- Contact_Position: Operational Geologist
- 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) 427-4757
- Contact_Facsimile_Telephone: (831) 427-4748
- Contact_Electronic_Mail_Address: dfinlayson@usgs.gov
- Browse_Graphic:
-
- Browse_Graphic_File_Name:
-
<http://walrus.wr.usgs.gov/infobank/s/s310sf/html/s-3-10-sf.index.png>
- Browse_Graphic_File_Description: Image showing S-3-10-SF survey tracklines.
- Browse_Graphic_File_Type: PNG
- Browse_Graphic:
-
- Browse_Graphic_File_Name:
-
<http://walrus.wr.usgs.gov/infobank/s/s910sf/html/s-9-10-sf.index.png>
- Browse_Graphic_File_Description: Image showing S-9-10-SF survey tracklines.
- Browse_Graphic_File_Type: PNG
- Data_Quality_Information:
-
- Attribute_Accuracy:
-
- Attribute_Accuracy_Report:
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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:
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Two separate bathymetric surveys of Corte Madera Bay were conducted: the first (USGS Field Activity ID: S-3-10-SF) from January 26 - 29,
2010 and the second (USGS Field Activity ID: S-9-10-SF) on March 29 and 30, 2010. The combined bathymetric surveys consist of 215 survey
lines covering an area of approximately 6.5 square km, extending north to the dredged ferry channel leading to Corte Madera Creek and to the south,
just beyond Paradise Cay Yacht Harbor.
- 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:
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After filtering the data to remove obvious outliers, the standard deviation of the remaining sounding elevations
was calculated for each 1 m x 1 m cell (each containing over 400 soundings on average) in CARIS. The mean
of the standard deviation for all cells in the Corte Madera survey is 0.06 m and 98% of the cells in the data set have a
standard deviation of less than 0.15 m.
- Lineage:
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- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: U.S. Geological Survey, Coastal and Marine Geology Program
- Title: USGS CMG Field Activity S-3-10-SF
- Geospatial_Data_Presentation_Form: raster digital data
- Online_Linkage:
-
<http://walrus.wr.usgs.gov/infobank/s/s310sf/html/s-3-10-sf.meta.html>
- Type_of_Source_Media: online
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Range_of_Dates/Times:
-
- Beginning_Date: 20100126
- Ending_Date: 20100129
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: S-3-10-SF
- Source_Contribution:
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This 2010 field activity collected bathymetric data in San Francisco Bay.
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: U.S. Geological Survey, Coastal and Marine Geology Program
- Title: USGS CMG Field Activity S-9-10-SF
- Geospatial_Data_Presentation_Form: raster digital data
- Online_Linkage:
-
<http://walrus.wr.usgs.gov/infobank/s/s910sf/html/s-9-10-sf.meta.html>
- Type_of_Source_Media: online
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Range_of_Dates/Times:
-
- Beginning_Date: 20100329
- Ending_Date: 20100330
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: S-9-10-SF
- Source_Contribution:
-
This 2010 field activity collected bathymetric data in San Francisco Bay.
- Process_Step:
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- Process_Description:
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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. Real-time kinematic (RTK) GPS position data
were passed through a CodaOctopus F180 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: 2010
- Process_Step:
-
- Process_Description:
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Geodetic Control
Geodetic control for the survey was established using a shore based Global Positioning System (GPS) base
station broadcasting Real Time Kinematic (RTK) corrections to the survey vessel via UHF radio link. The base
station was located in the hills along Taylor Drive. The base station was programmed using the WGS84 (G1150)
reference frame with an Epoch of 2010.1532.
The base station was programmed using the following coordinates: (see also CM01-base-setup.JPG)
Reference Frame: WGS84 (G1150)
Epoch: 2010.0630
Latitude: N 37° 54 51.37721
Longitude: W 122° 29 13.21809
Ellipsoid Height: 88.829m
The average value for the derived OPUS solutions for CM01 are:
Reference Frame: ITRF00 [same as WGS84 (G1150)]
Epoch: 2010.1532
Latitude: N 37° 54 51.37819
Longitude: W 122° 29 13.21786
Ellipsoid Height: 88.780m
The differences to be added to the RTK broadcast locations are:
Latitude: +0.00098
Longitude: -0.00023
Ellipsoid Height: -0.049m
Using UTM coordinates as a comparison:
The base station was programmed using the following coordinates:
Reference Frame: NAD83, UTM zone 10
Epoch: 2002.0000
Northing: 4196426.796m
Easting: 545093.600m
Ellipsoid Height: 89.359m
Orthometric Height: 121.700m (based Geoid09)
The average value for the derived OPUS solutions for CM01 are:
Reference Frame: NAD83, UTM zone 10
Epoch: 2002.0000
Northing: 4196426.825m
Easting: 545093.607m
Ellipsoid Height: 89.310m
Orthometric Height: 121.651m (based Geoid09)
The differences to be added to the RTK broadcast locations are:
Northing: +0.029m
Easting: +0.007m
Ellipsoid Height: -0.049m
Orthometric Height: -0.049m
- Process_Date: 2010
- Process_Step:
-
- Process_Description:
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Vessel Position and Attitude
The R/V Snavely was equipped with a CodaOctopus F180 attitude and positioning system for the duration of
the survey. The F180 is running F190 firmware, and receives real-time kinematic (RTK) corrections directly.
The RTK GPS data (2 cm error ellipse) are combined with the inertial motion measurements directly within the
F190 hardware so that high-precision position and attitude corrections are fed in real-time to the sonar
acquisition equipment. The WGS84 (G1150) Epoch 2010.1532 3-dimensional reference frame was used for
all data acquisition.
- Process_Date: 2010
- Process_Step:
-
- Process_Description:
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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: 2010
- Process_Step:
-
- Process_Description:
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Sonar Sounding Processing
GPS data and measurements of vessel motion are combined in the F180 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 3.05.18.04). 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. Processed (.sxp) files were further processed with sxpegn (build 151) by
Amy Foxgrover (USGS) to remove erroneous data from the files and make valid gain-normalized amplitude
data for processing backscatter data.
- Process_Date: 2010
- Process_Step:
-
- Process_Description:
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Digital Elevation Model Production
The 1-m resolution BASE surface was created in CARIS using a swath angle weighting scheme where higher weight
is given to soundings from the inner part of a swath than to outer beams from adjacent track lines.
This data set is the original bathymetry with datum conversions applied. No additional smoothing or interpolation
has been applied so some small-scale ripple features are distinguishable on the bed floor, but gaps exist near
nadir and between track lines.
- Process_Date: 20110320
- Spatial_Data_Organization_Information:
-
- Direct_Spatial_Reference_Method: raster
- Raster_Object_Information:
-
- Raster_Object_Type: grid cell
- Row_Count: 4165
- Column_Count: 4030
- 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: World Geodetic System 1984 (G1150)
- Ellipsoid_Name: WGS 84
- Semi-major_Axis: 6378137
- Denominator_of_Flattening_Ratio: 298.257
- Vertical_Coordinate_System_Definition:
-
- Altitude_System_Definition:
-
- Altitude_Datum_Name: World Geodetic System 1984 (G1150)
- 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:
-
Altitude (elevation) above the WGS84 (G1150) ellipsoid in meters. Values are positive up.
- Entity_Type_Definition_Source: NA
- Distribution_Information:
-
- Distributor:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization:
-
U.S. Geological Survey, Pacific Coastal and Marine Science Center (PCMSC)
- Contact_Person: David P Finlayson
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 400 Natural Bridges Drive
- City: Santa Cruz
- State_or_Province: CA
- Postal_Code: 95060-5792
- Country: US
- Contact_Voice_Telephone: 831-427-4757
- Contact_Facsimile_Telephone: 831-427-4748
- Contact_Electronic_Mail_Address: dfinlayson@usgs.gov
- Resource_Description: Downloadable Data
- Distribution_Liability:
-
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by
the U.S. Government.
Please recognize the U.S. Geological Survey (USGS) as the source of this information. Physical materials
are under controlled on-site access. Some USGS information accessed through this means may be
preliminary in nature and presented without the approval of the Director of the USGS. This information is
provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from
such information are the responsibility of the user.
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- Online_Option:
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- Computer_Contact_Information:
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- Network_Address:
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- Network_Resource_Name: <https://pubs.usgs.gov/of/2011/1217/>
- Fees: No cost
- Metadata_Reference_Information:
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- Metadata_Date: 20110429
- 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: 831-427-4785
- Contact_Electronic_Mail_Address: afoxgrover@usgs.gov
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Generated by mp version 2.9.12 on Thu Oct 13 21:28:18 2011