SeaBOSS images from cruise SUN00030: JPEG format

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Frequently-anticipated questions:

What does this data set describe?

Title: SeaBOSS images from cruise SUN00030: JPEG format
Pulley Ridge is a series of drowned barrier islands that extends almost 200 km in 60-100 m water depths. This drowned ridge is located on the Florida Platform in the southeastern Gulf of Mexico about 250 km west of Cape Sable, Florida. This barrier island chain formed during the initial stage of the Holocene marine transgression. These islands were then submerged and left abandoned near the outer edge of the Florida Platform. The southern portion of Pulley Ridge hosts zooxanthellate scleractinian corals, green, red and brown macro algae, and a mix of deep and typically shallow-water tropical fishes. This reef community is in unusually deep water, and its extent and the controls on its distribution were unknown. To address these questions scientists from the U.S. Geological Survey Coastal and Marine Geology Program in cooperation with scientists from the University of South Florida Department of Marine Sciences have completed a detailed mapping of the southernmost 35 km of Pulley Ridge. The area was mapped using multibeam bathymetry, sidescan-sonar imagery, and high-resolution seismic-reflection profiling to define the geologic framework on which the reef is established. Submersible dives, remotely operated vehicle (ROV) transects, and transects of bottom photographs and video were collected to identify the corals and to map their distribution. This extensive suite of data has been compiled and preliminary analysis of the data suggests that the reefs are not tied to the ridge system, but instead are more broadly distributed. Whether reef distribution is controlled by oceanographic conditions or by subtle differences in the substrate that overlies the barrier island system is unclear, and are topics of continued research.
  1. How should this data set be cited?

    Blackwood, Dann, Twichell, David C. , Halley, Robert B. , and Cross, VeeAnn A. , 2005, SeaBOSS images from cruise SUN00030: JPEG format:.

    Online Links:

    This is part of the following larger work.

    Cross, VeeAnn A. , Twichell, David C. , Halley, Robert B. , Ciembronowicz, Kate T. , Jarrett, Bret D. , Hammar-Klose, Erika S. , Hine, Al C. , Locker, Stan D. , and Naar, Dave F. , 2005, GIS Compilation of Data Collected from the Pulley Ridge Deep Coral Reef Region: Open-File Report 2005-1089, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -83.738463
    East_Bounding_Coordinate: -83.644162
    North_Bounding_Coordinate: 24.95624
    South_Bounding_Coordinate: 24.706245

  3. What does it look like?

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

    Beginning_Date: 25-Apr-2003
    Ending_Date: 30-Apr-2003
    Currentness_Reference: ground condition

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

  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 1024 x 1536

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

  7. How does the data set describe geographic features?

    Although the images themselves have no georeferencing information, the navigation from when each photograph was taken is in an ESRI formatted shapefile - photopnts.shp.

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?

    Robert B. Halley
    U.S. Geological Survey
    USGS Center for Coastal and Watershed Studies
    St. Petersburg, FL 33701-4846

    (727) 803-8747 x3113 (voice)
    (727) 803-2032 (FAX)

Why was the data set created?

These seafloor bottom images indicate the type and presence of coral in the Pulley Ridge area. These photos can be combined with the photo navigation to draw a more complete picture of coral distribution in the area.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    (process 1 of 3)
    The USGS SeaBOSS system was deployed to capture still photos and bottom imagery from the Pulley Ridge area in the Gulf of Mexico. The still photos are recorded on long rolls of film.

    (process 2 of 3)
    This film was then sent to Two Cat Digital company in California to be digitized into PCD image format and written to CD.

    (process 3 of 3)
    The PCD image format is a multi-resolution format. The convert command from Imagick, running under Cygwin, was used to extract the 1536 x 1024 resolution image and convert it to JPEG format.

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

    Cross, VeeAnn A. , Blackwood, Dann S. , Halley, Robert B. , and Twichell, David C. , 2004, Bottom Photographs from the Pulley Ridge Deep Coral Reef: Open-File Report 2004-1228, U.S. Geological Survey, Woods Hole Science Center, Woods Hole, MA.

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?

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

How can someone get a copy of the data set?

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

Access_Constraints: None.
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.

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

    Robert B. Halley
    U.S. Geological Survey
    USGS Center for Coastal and Watershed Studies
    St. Petersburg, FL 33701-4846

    (727) 803-8747 x3113 (voice)
    (727) 803-2032 (FAX)

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    These data were prepared by an agency of the United States Government. Neither the United States government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Although all data published in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 13-May-2005
Metadata author:
VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)

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

Generated by mp version 2.8.6 on Fri May 13 13:36:00 2005