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all_back.txt - Sidescan sonar backscatter image in the Nearshore Benthic Habitat Mapping Project S. California map series.

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently-anticipated questions:

What does this data set describe?

Title:
all_back.txt - Sidescan sonar backscatter image in the Nearshore Benthic Habitat Mapping Project S. California map series.
Abstract:
The sidescan sonar image of the nearshore seafloor (0 to 100 m water depths) of the Santa Barbara Channel area was mosaicked from data collected in 2005. A 234 kHz Interferometric Submetix Swath Bathy Sonar System; SEA Swath Processor, v. 2.05, SEA Grid Processor v. 2.05, was used for geophysical surveying. The 2005 survey was navigated with a CodaOctopus, Model F180, Differential Global Positioning System (DGPS). A KVH Industries Inc. azimuth digital gyro-compass provided ship headings with 0.5 degree accuracy. Navigation data were recorded using Yo-Nav version 1.19 (Gann, 1992). The sidescan fish was towed approximately 30 m above the seafloor. The distance of the fish behind the ship was not known during this survey and must be estimated when the data are processed in order to produce the sidescan image mosaics. The resolution of the processed data mosaics is 0.2 m. The data are presented here at a resolution of 1 m. This is one of a collection of digital files of a geographic information system of spatially referenced data related to the USGS Coastal and Marine Geology Program Nearshore Benthic Habitat Mapping Project. See <http://walrus.wr.usgs.gov/nearshorehab> for more information.

Supplemental_Information:
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?

    Golden, Nadine E. , and Cochrane, Guy R. , 2007, all_back.txt - Sidescan sonar backscatter image in the Nearshore Benthic Habitat Mapping Project S. California map series.: Open-File Report 2007-XXXX, U.S. Geological Survey, Santa Cruz, CA.

    Online Links:

    This is part of the following larger work.

    Cochrane, Guy R. , Golden, Nadine, Dartnell, Pete, Schroeder, Donna, Conrad, Jamie, and Stevenson, Andy, 2007, Seafloor Mapping and Benthic Habitat GIS for Southern California, Volume III.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -119.643628
    East_Bounding_Coordinate: -119.471725
    North_Bounding_Coordinate: 34.390598
    South_Bounding_Coordinate: 34.320467

  3. What does it look like?

    images/all_back.jpg (JPEG)
    Image showing coverage of all backscatter data ArcInfo format.

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

    Beginning_Date: 08-Aug-2005
    Ending_Date: 27-Aug-2005
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: map

  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 7308 x 7325, type Pixel

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

  7. How does the data set describe geographic features?

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 R. Cochrane
    U.S. Geological Survey, Coastal and Marine Geology
    Geophysicist
    USGS Pacific Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA 95060-5792
    USA

    (831) 427-4754 (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) software to display geologic and oceanographic information.

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: 02-Jul-2006 (process 1 of 1)
    Mosaiced backscater from the 3 regions, Channel West, Channel Central, and Channel East. See metadata for these three files for process steps.

  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:

    Guy Cochrane, U.S. Geological Survey, Coastal and , 200510, Sonar Survey of Sea-Floor Habitats Southeast of Santa Barbara, California in Sound Waves Monthly Newsletter, Coastal Science & Research News from Across the USGS.

    Online Links:

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

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

    On the order of 10 meters.

  3. How accurate are the heights or depths?

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

    Please see the Methods section of <http://pubs.usgs.gov/of/2007/XXXX/> for information about omissions, selection criteria, generalization, definitions used, and other rules used to derive the data set.

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

    Logical Consistency untested.

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:
Public domain data from the U.S. government is freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

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

    U.S. Geological Survey, Coastal and Marine Geology
    c/o Guy R. Cochrane
    Geophysicist
    USGS Pacific Science Center, 400 Natural Bridges Drive
    Santa Cruz, CA 95060-5792
    USA

    (831) 427-4754 (voice)
    (831) 427-4748 (FAX)
    gcochrane@usgs.gov

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

  3. What legal disclaimers am I supposed to read?

    Although this data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.

    Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 11-Jul-2007
Metadata author:
U.S. Geological Survey, Coastal and Marine Geology
c/o Nadine Golden
Geographer
USGS Pacific Science Center, 400 Natural Bridges Drive
Santa Cruz, CA 95060-5792
USA

(831) 427-4730 (voice)
(831) 427-4748 (FAX)
ngolden@usgs.gov

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

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URL: http://pubs.usgs.gov/of/2007/XXXX/
Maintained by: Mike Diggles
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Generated by mp version 2.8.11 on Thu Jul 12 09:56:42 2007