Bathymetry Data Collected in 2011 - Farallon Escarpment and Rittenburg Bank, Northern California

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Frequently anticipated questions:

What does this data set describe?

Title:
Bathymetry Data Collected in 2011 - Farallon Escarpment and Rittenburg Bank, Northern California
Abstract:
These metadata describe bathymetry data collected in 2011 by the U.S. Geological Survey (USGS), Coastal and Marine Geology Program. Bathymetry and acoustic-backscatter data were acquired along the upper slope of the Farallon Escarpment as well as Rittenburg Bank located within the Gulf of the Farallones National Marine Sanctuary offshore of the San Francisco Bay area. The surveys were funded by the National Oceanic and Atmospheric Administration (NOAA) Deep Sea Coral Research and Technology Program (DSCRTP) to identify potential Deep Sea Coral (DSC) habitat prior to planned sampling efforts.
Supplemental_Information:
Information for the related USGS Pacific Coastal and Marine Science Center data collection field activities, F-01-11-NC, online at <http://walrus.wr.usgs.gov/infobank/f/f0111nc/html/f-01-11-nc.meta.html>.

  1. How should this data set be cited?

    U.S. Geological Survey (USGS), 2014, Bathymetry Data Collected in 2011 - Farallon Escarpment and Rittenburg Bank, Northern California:.

    Online Links:

    This is part of the following larger work.

    Dartnell, Peter, Cochrane, Guy R., and Finlayson, David P., 2014, Bathymetry, Acoustic Backscatter, and Seafloor Character - Farallon Escarpment and Rittenburg Bank, Northern California: Open-File Report 2014-1234, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -123.43
    East_Bounding_Coordinate: -123.07
    North_Bounding_Coordinate: 37.92
    South_Bounding_Coordinate: 37.65

  3. What does it look like?

    <bathy_quickview.gif> (GIF Farallon Escarpment and Rittenburg Bank)
    Shaded relief bathymetry image of Farallon Escarpment and Rittenburg Bank.

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

    Beginning_Date: 2011
    Ending_Date: 2012
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: Raster

  6. How does the data set represent geographic features?

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

      This is a Raster data set. It contains the following raster data types:

      • Dimensions, type Grid Cell

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

      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: -123.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 500000.0
      False_Northing: 0.00

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 10.0, 2.0
      Ordinates (y-coordinates) are specified to the nearest 10.0, 2.0
      Planar coordinates are specified in Meters

      The horizontal datum used is NAD83.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.00 meters.
      The flattening of the ellipsoid used is 1/0.003352811.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The 10-m Farallon Escarpment bathymetry surface was originally archived as an ESRI grid with the following attributes: 
    Cell size = 10.0
Number of rows = 2484
Number of columns = 3135

Data type = floating point

Boundary
Xmin = 462375
Xmax = 493725
Ymin = 4167245
Ymax = 4192085

Statistics
Minimum value = -944.20
Maximum value = -87.04
Mean = -320.82
Standard deviation = 204.13

Coordinate system description
Projection  UTM
Zone  10
Datum  NAD83
Vertical Datum  NAVD88
Units  meter
    The 2-m Rittenburg Bank bathymetry surface was originally archived as an ESRI grid with the following attributes: 
    Cell size = 2.0
Number of rows = 4016
Number of columns = 2676

Data type = floating point

Boundary
Xmin = 468181
Xmax = 473533
Ymin = 4187955
Ymax = 4195987

Statistics
Minimum value = -120.00
Maximum value = -44.52
Mean = -106.38
Standard deviation = 7.95

Coordinate system description
Projection  UTM
Zone  10
Datum  NAD83
Vertical Datum  NAVD88
Units  meter
    Entity_and_Attribute_Detail_Citation: none

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?

    Guy Cochrane
    U.S. Geological Survey, Pacifc Coastal and Marine Science Center
    Research Geophysicist
    400 Natural Bridge Dr.
    Santa Cruz, CA 95060-5792
    USA

    (831) 460-7554 (voice)
    (831) 427-4748 (FAX)
    gcochrane@usgs.gov

Why was the data set created?

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 identify bathymetric features. These data are not intended for navigational purposes.

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: 2013 (process 1 of 1)
    Multibeam mapping took place over 16 days from September 6 through September 21, 2011 (U.S. Geological Survey field activity F-01-11-NC). The survey was conducted using a 100-kHz Reson 7111 multibeam echosounder. The 7111 is a horseshoe shaped sonar that was mounted on the 67-foot NOAA National Marine Sanctuary Program's research vessel Fulmar and affixed to a hull brace. Differentially Corrected Global Positioning System (DGPS) navigational data and measurements of vessel motion were combined in the F190 hardware to produce a high-precision vessel attitude packet. This packet was transmitted to the PDS2000 acquisition software in real time and combined with instantaneous sound velocity measurements at the transducer head before each ping. The returned samples were projected to the seafloor using a ray-tracing algorithm working with the previously measured sound-velocity profiles in the PDS2000 software. Finally, the processed data were stored line-by-line as Reson S7K files. CARIS HIPS and SIPS (version 7.1.1 Service Pack 3) bathymetry processing software was used to further clean and bin the raw bathymetry. The finalized base surfaces were then exported as ASCII XYZ files (x-coordinate, y-coordinate, depth) in World Geodetic System of 1984 (WGS84, G1150) coordinates relative to the North American Vertical Datum of 1988 (NAVD-88). These data were gridded in Fledermaus (QPC) software (Version 7.1) at 2- and 10-m resolutions and the resulting surfaces were converted to ASCIIRaster format files and imported into a Geographic Information System (ESRI, ArcMap). Grids were projected horizontally to the North American Datum of 1983 (CORS96) using the ESRI WGS_1984_(ITRF00)_To_NAD_1983 (CORS96) function in ArcTools.

    Person who carried out this activity:

    Peter Dartnell
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Physical Scientist
    400 Natural Bridges Dr.
    Santa Cruz, CA 95060-5792
    USA

    (831) 460-7415 (voice)
    pdartnell@usgs.gov

  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?

    Not applicable for raster data.

  2. How accurate are the geographic locations?

    Estimated to be no less than 2 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.

  3. How accurate are the heights or depths?

    Estimated to be no less than 20 cm, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.

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

    Complete

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

    Unspecified

How can someone get a copy of the data set?

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

Access_Constraints: None
Use_Constraints:

USGS-authored or produced data and information are in the public domain. 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 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. 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.

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

    U.S. Geological Survey
    345 Middlefield Rd
    Menlo Park, CA 94025-3561
    USA

    (650) 329-4309 (voice)

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

  3. What legal disclaimers am I supposed to read?


    This database, identified as Bathymetry of the Farallon Escarpment and Rittenburg Bank, northern California has been approved for release and publication by the U.S. Geological Survey (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 these data have been processed successfully on a computer system at 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. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. 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. These data are not intended for navigational use.


  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 22-Jul-2014
Last Reviewed: 22-Jul-2014
Metadata author:
Peter Dartnell
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Physical Scientist
400 Natural Bridges Dr.
Santa Cruz, CA 95060-5792
USA

(831) 460-7415 (voice)
(831) 427-4709 (FAX)
pdartnell@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)

Generated by mp version 2.9.26 on Tue Jul 22 12:09:45 2014