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Frequently-anticipated questions:

What does this data set describe?

Title: SSFB05_zones
Tidal zonation polygons generated by NOAA's Center for Operational Oceanographic Products and Services (CO-OPS) division in Silver Spring, MD for the 2005 South San Francisco Bay bathymetric survey.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.

  1. How should this data set be cited?

    NOAA's Center for Operational Oceanographic Products and Services (CO-OPS), 2007, SSFB05_zones.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.413830
    East_Bounding_Coordinate: -121.935012
    North_Bounding_Coordinate: 37.725492
    South_Bounding_Coordinate: 37.418448

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2007
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set.

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 10
      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 coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000064
      Ordinates (y-coordinates) are specified to the nearest 0.000064
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Shapefile attribute table (Source: NOAA/NOS)

    zone used for tidal reduction (Source: CO-OPS)


    time corrector (in minutes) relative to an operating water level gauge for reducing soundings in this zone to MLLW (Source: CO-OPS)

    Positive and negative numbers (in minutes).

    range corrector relative to an operating water level gauge for reducing soundings in this zone to MLLW (Source: CO-OPS)

    Positive numbers.

    reference tide station for reducing soundings in this zone to MLLW (Source: CO-OPS)

    number representing tide station ID

    offset between MLLW and NAVD88 (in cm). (Source: CO-OPS)

    Positive numbers (in cm).

    offset between MLLW and NAVD88 (in ft). (Source: CO-OPS)

    Positive numbers (in ft).

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Area of feature in internal units squared. (Source: ESRI)

    Positive real numbers that are automatically generated.

    Perimeter of feature in internal units. (Source: ESRI)

    Positive real numbers that are automatically generated.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Gerald Hovis
    NOAA National Ocean Service, SSMC4, Station 7204, 1305 East-West Highway
    Silver Spring, MD 20910-3281

    (301) 713-2890 ext 109 (voice)

    Secondary Contact: Craig Martin (301) 713-2897 ext 133

Why was the data set created?

Zones contain unique range and time correctors based upon specific tide gauges for referencing soundings to MLLW. Zones also contain values for converting bathymetric data between MLLW and NAVD88. Zones 51 and higher do not contain a conversion from MLLW to NAVD88 although it is estimated the conversion would be in the range of 1.8 to 2 feet (55-61 cm). Conversion values are given in both feet and centimeters. To convert from NAVD88 to MLLW add the MLLW2NAVD_CM attribute values to NAVD88 values in cm.

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: 2007 (process 1 of 1)
    Metadata imported.

  3. What similar or related data should the user be aware of?

    U.S. Geological Survey, Coastal and Marine Geology Program, 2007, InfoBank.

    Online Links:

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

  1. How well have the observations been checked?

    Not determined.

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?


  5. How consistent are the relationships among the observations, including topology?

    Polygon features present.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Please regonize the U.S. Geological Survey (USGS) and the National Oceanographic and Atmoshperic Administration (NOAA) as the source of this information. USGS-authored or produced data and information are in the public domain.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey, Coastal and Marine Geology
    c/o Bruce Jaffe
    400 Natural Bridges Dr
    Santa Cruz, CA 95060-5792

    (831) 427-4742 (voice)

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

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

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 11-May-2007
Metadata author:
Amy Foxgrover
U.S. Geological Survey, Coastal and Marine Geology
400 Natural Bridges Dr
Santa Cruz, CA 95060-5792

(831) 427-4743 (voice)
(831) 427-4748 (FAX)

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

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Maintained by: Mike Diggles
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Generated by mp version 2.8.11 on Wed May 23 13:31:51 2007