Location of mosaicked seafloor photos extracted from videotape, San Pedro shelf, southern California - VIDMOSFOOT.SHP

Metadata also available as

Frequently-anticipated questions:

What does this data set describe?

Title:
Location of mosaicked seafloor photos extracted from videotape, San Pedro shelf, southern California - VIDMOSFOOT.SHP
Abstract:
Vidmosfoot.shp is a GIS file that shows the location of seafloor photographs extracted from videotape (collected September 2004, O-1-04-SC) and mosaicked into continuous strips.
This data set is one of a collection of digital files of a geographic information system (GIS) of spatially referenced data related to the study of seafloor geology and benthic habitats of the San Pedro shelf off southern California.
The San Pedro shelf study area covers approximately 400 sq km offshore of the metropolitan Los Angeles area out to a water depth of about 150 m (492 ft). The seafloor hosts a rich and varied biologic community and is subject to anthropogenic inputs from shipping traffic, sewage outfall systems, commercial fisheries, and recreational use. Between 1998 and 2004, the U.S. Geological Survey (in cooperation with Los Angeles and Orange County Sanitation Districts) mapped the seafloor with sonar technologies, collected video and still photography, and collected sediment samples to develop a characterization of this shelf area.
Supplemental_Information:
Additional information about the field activities from which this data set was derived are available online at 
 <http://walrus.wr.usgs.gov/infobank/o/o104sc/html/o-1-04-sc.meta.html>
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?

    Phillips, Eleyne L. , Dartnell, Peter, and Wong, Florence L. , 2012, Location of mosaicked seafloor photos extracted from videotape, San Pedro shelf, southern California - VIDMOSFOOT.SHP: U.S. Geological Survey Data Series 552, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

    • <https://pubs.usgs.gov/ds/552/>

    This is part of the following larger work.

    Wong, Florence L. , Edwards, Brian D. , Dartnell, Peter, and Phillips, Eleyne L. , 2012, Seafloor Geology and Benthic Habitats of the San Pedro shelf, southern California: U.S. Geological Survey Digital Series 552, U.S. Geological Survey, Menlo Park, California.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -118.338133
    East_Bounding_Coordinate: -117.949982
    North_Bounding_Coordinate: 33.715607
    South_Bounding_Coordinate: 33.562234

  3. What does it look like?

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

    Calendar_Date: 2004
    Currentness_Reference: ground condition

  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. It contains the following vector data types (SDTS terminology):

      • Entity point (183)

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 11
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -117.000000
      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 0.00001
      Ordinates (y-coordinates) are specified to the nearest 0.00001
      Planar coordinates are specified in meters

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    vidmosfoot
    outline of mosaicked seafloor images (Source: this study)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    AREA
    area of region polygon (Source: ESRI)

    area in square meters

    PERIMETER
    perimeter of region polygon (Source: ESRI)

    perimeter in meters

    FOOT_ID
    sequential identification number (Source: this study)

    user identification number

    LABEL
    identity of mosaic image (Source: this study)

    identification label

    VIDMOSAIC
    name of image file (Source: this study)

    name of TIFF image file

    DATA_URL
    path to data folder (Source: this study.)

    path to data files

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?

    U.S. Geological Survey
    c/o Florence L. Wong
    345 Middlefield Road Mail Stop 999
    Menlo Park, CA 94025
    USA

    650-329-5327 (voice)
    fwong@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: 2007 (process 1 of 2)
    In October 2004, 365 line-kilometers of seafloor video and over 13,000 photographs were collected over the entire San Pedro Shelf. A 2 m by 1 m camera sled was towed about 2 m off bottom at a speed of about 2 knots. The sled consisted of one forward-looking video camera and one vertical video camera, each with paired lasers for estimating scale, one 6-megapixel camera, and flood lights. Both videos were streamed to the ship in real time for observation on TV monitors and recorded on MiniDV tapes. Navigational information including GMT (Greenwich Mean Time) and geographic coordinates were superimposed on the video and recorded onto the second channel of the MiniDV tapes.
    Video segments were captured from the MiniDV tapes using Adobe Premiere software and saved in AVI video format. Geographic coordinates of prominent features on the sea floor were recorded usually and the beginning and end of the video segment.
    Using a suite of programs developed by Dr. Yuri Rzhanov, University of New Hampshire (UNH), Center for Coastal and Ocean Mapping through a cooperative USGS - UNH agreement, the video frames were sub-sampled every 2 to 15 frames depending on the camera sled speed over the sea floor. The video frame was cropped depending on lighting and super-imposed text. Frame-to-frame offset measures were calculated using pattern recognition. Finally, each frame was stitched to the previous frame using the offset values that resulting in a bitmap (BMP) image.
    The BMP image was converted to a TIFF image and geo-referenced using standard GIS techniques with the recorded geographic coordinates.
    The shapefile vidmosfoot.shp consists of the outlines of the mosaicked images.

    Date: 29-Aug-2012 (process 2 of 2)
    Metadata imported.

    Data sources used in this process:

    • d:\temp\xml54.tmp

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

    Folk, Robert L. , 1980, Petrology of Sedimentary Rocks: Hemphill Publishing Co., Austin TX.

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?

  3. How accurate are the heights or depths?

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

    Complete.

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

    Point 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
Use_Constraints: None

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

    U.S. Geological Survey
    c/o Florence L. Wong
    345 Middlefield Road Mail Stop 999
    Menlo Park, CA 94025
    USA

    (650) 329-5327 (voice)
    fwong@usgs.gov

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data.
    The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 01-Jun-2010
Last Reviewed: 2010
Metadata author:
U.S. Geological Survey
c/o Florence L Wong
345 Middlefield Road Mail Stop 999
Menlo Park, CA 94025
USA

650-329-5327 (voice)
fwong@usgs.gov

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

Generated by mp version 2.9.6 on Wed Aug 29 13:57:26 2012