Water pressure/depth, velocity, and turbidity time-series data from CHC16 Bay shallows stations in San Pablo Bay and China Camp Marsh, California

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Frequently anticipated questions:

What does this data set describe?

Water pressure/depth, velocity, and turbidity time-series data from CHC16 Bay shallows stations in San Pablo Bay and China Camp Marsh, California
Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on water depth, velocity, salinity/temperature, and turbidity. Deployment data are grouped by region (Bay channel (main Bay), Bay shallows, tidal creek, or marsh/mudflat/upper tidal creek). Users are advised to check metadata and instrument information carefully for applicable time periods of specific data, as individual instrument deployment times vary.
Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-632-FA
  1. How might this data set be cited?
    Lacy, Jessica R., and Allen, Rachel M., 2017, Water pressure/depth, velocity, and turbidity time-series data from CHC16 Bay shallows stations in San Pablo Bay and China Camp Marsh, California: data release DOI:10.5066/F7HM56MX, U.S. Geological Survey, Pacific Coastal and Marine Science Center Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Lacy, Jessie R., Allen, Rachel M., Foster-Martinez, Madeline R., Joanne C. T. Ferreira, and O'Neill, Andrea, 2017, Hydrodynamic and sediment transport data from San Pablo Bay and China Camp marsh (northern San Francisco Bay), 2013-2016: data release DOI:10.5066/F7HM56MX, U.S. Geological Survey, Pacific Coastal and Marine Science Center Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.4930
    East_Bounding_Coordinate: -122.3697
    North_Bounding_Coordinate: 38.0451
    South_Bounding_Coordinate: 38.0060
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/58af74fae4b01ccd54f9f5cf?name=CHC16_BayshallowsStations.png&allowOpen=true (PNG)
    image showing location of deployment instrument locations for listed area
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-May-2016
    Ending_Date: 22-Jun-2016
    dates of observations
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: NetCDF files
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Entity point (7)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is World Geodetic System 1984 (WGS84).
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.0 m.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    NetCDF files are self-contained and attribute information may be found in the header of the file itself.
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Jessica R. Lacy
    • Rachel M. Allen
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Jessica R. Lacy
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Research Oceanographer
    2885 Mission Street
    Santa Cruz, CA

    831-460-7520 (voice)
    831-427-4748 (FAX)

Why was the data set created?

Data from these experiments will be used to investigate the spatial and temporal variation in suspended sediment transport at the marsh boundary in order to better inform predictions of marsh resilience, and offer more complete characterizations of sediment transport and conditions within this unique environment.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 04-May-2016 (process 1 of 3)
    Instruments at each station are: Sontek Field and Ocean ADV, with OBS3 optical backscatter sensor and Paroscientific bursting pressure sensor, RBR XR-420 or Concerto CTD (with Seapoint optical backscatter attached at one station), except at station M2T where only a Seabird SBE-37 CTD was deployed. Optical backscatter, which is linearly related to turbidity, is reported as voltage over the range 0-5 V. Turbidity is reported from 0-500 FNU.
    Date: 22-Jun-2016 (process 2 of 3)
    Instruments were retrieved, and data were recovered from the instruments. Data were processed and accumulated into NetCDF files. During the lowest tides, some instruments were not submerged; these data remain. Pressure data from the ADVs were not adjusted from absolute pressure to hydrostatic pressure.
    Date: 12-Oct-2017 (process 3 of 3)
    Data files were named with a convention that uses a 12- to 13-digit alpha-numeric code; zip files use an abridged eight-digit code. The first three characters for this dataset are for the deployment name (CHC for China Camp measurements including all measurement locations from Bay channel stations to Tidal Creek stations; abridged deployments with measurements taken only at Bay Shallows stations begin with 'SP' followed by A, B, C, or D to denote chronological occurrence). The fourth and fifth positions represent the calendar year in which the first data point in the file was taken (13, 2013; 14, 2014; 15, 2015; 16, 2016). The sixth through eighth positions represent the station identification - see the graphic at https://www.sciencebase.gov/catalog/file/get/58458e82e4b04fc80e5233b3?name=SFBayStationLocations.png (all Bay stations) for location information. Zip files use the informative character codes outlined above for positions 1-8; additional character positions provide instrumentation information for the data files only. The ninth and tenth positions are numbers representing the instrument position on the frame (01, 02 or 03), with 01 as uppermost on the frame. Next is a two- to three-character code for the instrument and data type (adv = Sontek ADV; bpr = RBR bursting pressure sensor; ctd = RBR CTD; obs = optical backscatter; lst = LISST; sct = SeaBird seacat CTD; vec = Nortek ADV; wh = RDI ADCP current data; wv = RDI ADCP wave data). Note that some instruments also include additional external sensors. There are an additional two characters for the instruments that collect data in a bursting pattern to indicate if the burst is included in the file or the statistics of the burst; this indicator is omitted if there is no bursting pattern (-b, burst; -s, statistics). For special one-day LISST and CTD data (CHC16LSS), modified naming schemes were used to specify the station location information in character positions 6-12. The sixth through seventh positions (‘LS’) denote the data as special one-day LISST and CTD data. The eighth through tenth positions indicate the station identity. The remaining positions (11-12) are a numeric file code clarifying elevation of data collection as follows: file 01 was collected at N1T at 155 cm above bed; files 02, 03, and 04 were collected at S1T at 40, 100, and 170 cm above bed, respectively: file 05 is was collected at TDL at 40 cm above bed; file 06 was collected at MFT at 50 cm above bed: files 07 and 08 were collected at S1T (at a later time) at 30 and 170 cm above bed, respectively: and file 09 was collected at MFT (at a later time) at 60 cm above bed.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    Horizontal accuracy derived from GPS instrumentation is less than 1 m.
  3. How accurate are the heights or depths?
    The instrument height above the bed may have changed over the course of the deployment due to sinking of the frame or deposition or erosion of bed material. At many sites, the distance to bed was captured by the ADV, and is reflected by the sensor range to boundary variable brange in the netcdf.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract, with the exception of the ADV located at CHC16M2T03. There, optical backscatter and velocity data are not valid, but pressure data is reliable. Users are advised to read the metadata for each part of this data release carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted. Data fall within expected ranges.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
  2. What's the catalog number I need to order this data set? Downloadable data in NetCDF file format grouped in zip files. Within each zip file, separate NetCDF files are available for each instrument at the deployment location. The zip file and NetCDF file names consist of a multi-element alphanumeric code as defined in the Process Steps.
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 01-Nov-2017
Metadata author:
Jessica R. Lacy
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Research Oceanographer
2885 Mission Street
Santa Cruz, CA

831-460-7520 (voice)
831-427-4748 (FAX)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/sf_bay_delta/CHC16_shallows_metadata.faq.html>
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