10cct02_ss_v1_1m - Side scan sonar mosaic of Petit Bois Pass, Alabama, Mississippi Barrier Islands, March 2010

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Frequently anticipated questions:


What does this data set describe?

Title:
10cct02_ss_v1_1m - Side scan sonar mosaic of Petit Bois Pass, Alabama, Mississippi Barrier Islands, March 2010
Abstract:
In March of 2010, the U.S. Geological Survey (USGS) conducted geophysical surveys offshore of Petit Bois Island, Mississippi, and Dauphin Island, Alabama. These efforts were part of the U.S. Geological Survey Gulf of Mexico Science Coordination partnership with the U.S. Army Corps of Engineers (USACE) to assist the Mississippi Coastal Improvements Program (MsCIP) and the Northern Gulf of Mexico (NGOM) Ecosystem Change and Hazards Susceptibility Project by mapping the shallow geologic stratigraphic framework of the Mississippi Barrier Island Complex.
Supplemental_Information:
The U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center assigns a unique identifier to each cruise or field activity. For example, 10CCT02 tells us the data were collected in 2010 (10) for the Coastal Change and Transport (CCT) study and the data were collected during the second (02) field activity for that project in that calendar year. Refer to <http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html> for a detailed description of the method used to assign the field activity ID.Data were collected using the research vessel R/V Tommy Munro. Side scan sonar and interferometric swath bathymetry data were collected simultaneously along the tracklines. The side scan sonar towfish was flown off the port quarter astern of the vessel. The interferometric swath transducer was pole-mounted off the starboard quarter of the research vessel. Navigation was acquired with a Coda Octopus F190 Precision Attitude and Positioning System and differentially corrected with OmniSTAR GPS constellation. See the digital FACS equipment log for details about the acquisition equipment used. Both raw datasets were stored digitally and processed using SEA Ltd. Swath Processor version 3.07 and CARIS HIPS and SIPS software version 7.0 in the USGS St. Petersburg office. For more information on processing, refer to the Equipment and Processing page. Chirp seismic reflectivity data were also collected during this survey and are archived separately.
  1. How might this data set be cited?
    U.S. Geological Survey, 20110101, 10cct02_ss_v1_1m - Side scan sonar mosaic of Petit Bois Pass, Alabama, Mississippi Barrier Islands, March 2010: U.S. Geological Survey Data Series 577, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

    This is part of the following larger work.

    Pfeiffer, William R., Flocks, James G., DeWitt, Nancy T., Forde, Arnell S., Kelso, Kyle, Thompson, Phillip R., and Wiese, Dana S., 20101001, Archive of Side Scan Sonar and Swath Bathymetry Data Collected During USGS Cruise 10CCT02 Offshore of Petit Bois Island Including Petit Bois Pass, Gulf Islands National Seashore, Mississippi, March 2010: U.S. Geological Survey Data Series 577, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.485858
    East_Bounding_Coordinate: -88.171679
    North_Bounding_Coordinate: 30.254499
    South_Bounding_Coordinate: 30.101438
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Mar-2010
    Ending_Date: 30-Mar-2010
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: remote sensing image
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a point data set. It contains the following raster data types:
      • Dimensions 16616 x 30063 x 1, type Pixel
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 16
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -87.00000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.00000
      False_Northing: 0.000000
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      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?
    Entity_and_Attribute_Overview:
    Image pixel values contain acoustic reflectivity values normalized to an 8-bit digital number range (0-255). Lower pixel values correlate with lower signal loss in decibels. The background color is set at pixel value 255 and can be turned off without affecting sonar data values.
    Entity_and_Attribute_Detail_Citation:
    There are no attributes associated with a GeoTIFF image. Detailed_Description:

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
    Nancy T. DeWitt, William R. Pfeiffer, Jim Flocks, Dana Wiese
  3. To whom should users address questions about the data?
    James G. Flocks
    U.S. Geological Survey
    Research Geologist
    600 4th Street South
    St. Petersburg, Florida
    USA

    727-803-8747 (voice)
    jflocks@usgs.gov

Why was the data set created?

These geophysical surveys will provide the data necessary for scientists to define, interpret, and provide baseline bathymetry and seafloor habitat for this area and to aid scientists in predicting future geomorphological changes of the islands with respect to climate change, storm impact, and sea level rise. Furthermore, these data will provide information for barrier island restoration, particularly in Camille Cut, and protection for the historical Fort Massachusetts on Ship Island, Mississippi. The dataset herein is a complete side scan sonar backscatter image for the study area offshore of the above-mentioned area. For more information refer to; http://ngom.usgs.gov/gomsc/mscip/index.html.

How was the data set created?

  1. From what previous works were the data drawn?
    10CCT02 (source 1 of 1)
    U.S. Geological Survey, 20101001, Archive of Side Scan Sonar and Swath Bathymetry Data Collected During USGS Cruise 10CCT02 Offshore of Petit Bois Island Including Petit Bois Pass, Gulf Islands National Seashore, Mississippi, March 2010: U.S. Geological Survey Data Series 577, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    Side scan data acquisition was at sea, collected with a Klein 3900 dual-frequency towfish flown port-quarter of the R/V Tommy Munro. Data was acquired using SonarPro v.11.3 during a cruise in March 2010. Data were collected along planned tracklines approximately 150 meters apart at an average vessel speed of 4 knots. Navigation was calculated by means of DGPS satellite constellation position feed. Navigation data acquisition was at sea, collected with a real-time DGPS system aboard the R/V Tommy Munro. Navigation data were collected in a hydrographic survey software application along planned tracklines approximately 150 meters apart at an average vessel speed of 4 knots.
  2. How were the data generated, processed, and modified?
    Date: 01-Jun-2010 (process 1 of 2)
    Within CARIS SIPS v7.0 data were converted from (.xtf) format to digitize altitude, filter speckle noise, and apply AVG and TVG corrections. The corrected lines were then used to create Georeferenced Backscatter Rasters (GeoBARs), which were fully blended into a 1 meter/pixel resolution composite mosaic, which was then exported in GeoTIFF format. Person who carried out this activity:
    William R. Pfeiffer
    Jacobs Technology
    Data Modeler
    600 4th Street South
    St. Petersburg, Florida

    727-803-8747 (voice)
    wpfeiffer@usgs.gov
    Date: 14-Feb-2017 (process 2 of 2)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@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?
    The accuracy of the data is determined during data collection. This dataset is from a single cruise and therefore internally consistent. Methods are employed to maintain data collection consistency aboard various platforms. During mobilization, each piece of equipment (swath and sonar) is isolated to obtain internal and external offset measurements with respect to the survey platform. All the critical measurements are recorded manually and digitally and entered into their respective programs for calibration. Once calibration status is considered acceptable then survey operations commence. Each system has a dedicated computer and efforts are made to utilize the same equipment and software versions. However, upgrades and changes occur and require additional setup, measurements, and notation. The swath transducer sonar head was pole-mounted on the starboard side of the vessel. Offsets between the sonar head and the DGPS antennas were measured and entered into the F190 internal setup program. Differential Global Positioning System (DGPS) is normally provided through the OmniSTAR High Performance wide-area GPS service unless otherwise noted.
  2. How accurate are the geographic locations?
    The ship was navigated using the Coda Octopus F190 Precision Attitude and Positioning System. The software used is the F180 Series version 4.0.5. Two antennas received the integrated OmniSTAR High Performance DGPS correction. The software used is F180 Series version 4.0.5. The horizontal accuracy of bathymetric data is at the limit of OmniSTAR, a wide-area differential GPS service, which is within 20 cm. Unless noted, all DGPS data are referenced to WGS84. The swath transducer sonar head was pole-mounted off the starboard quarter of the vessel. Offsets between the sonar head and the DGPS antennas were measured and entered into the F190 internal calibration and setup program.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    There may in some cases be data missing and inconsistent with reported tracklines. This is directly due to the exclusion of poor data, instrument failures, or for the sake of consistent spatial resolution.
  5. How consistent are the relationships among the observations, including topology?
    This data set was completed on a single and continuous cruise over four days from the same research vessel platform.

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; please reference the U.S. Geological Survey as the originator of this dataset in any future products or research derived from these data series. Not for navigational purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: U.S. Geological Survey Information Services
    Box 25286, Federal Center
    Denver, CO
    USA

    1-888-ASK-USGS (voice)
    infoservices@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?
    This DVD publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, 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 imply any such warranty. The U.S. Geological Survey 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.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: ZIP data compression Size: 270
      Network links: http://pubs.usgs.gov/ds/577/software/arc.zip
      Media you can order: DVD-ROM (format DVD-RW)
    • Cost to order the data: None

    • Special instructions:
      Publications are available from U.S. Geological Survey Information Services, Box 25286, Federal Center, Denver, CO 80225-0046 (telephone: 1-888-ASK-USGS, e-mail: infoservices@usgs.gov).
  5. What hardware or software do I need in order to use the data set?
    This file was created for use with ESRI ArcGIS 10 (Build 2800) software. It may also be viewed with ESRI public domain software ArcGIS Explorer 1500 (2.0.0.1500), GeoMapApp 2.8.2 (http://www.geomapapp.org/), or other GIS software capable of importing the data. This disk is readable on any computing platform that has standard DVD-ROM driver software installed. The minimum software requirements for the larger citation are a web browser, Adobe Reader, and a text editor.

Who wrote the metadata?

Dates:
Last modified: 17-Apr-2018
Metadata author:
William R. Pfeiffer
Jacobs Technology
Data Modeler
600 Fourth St. South
St. Petersburg, Florida

727-803-8747 (voice)
wpfeiffer@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/ds-577metadata_sidescan.faq.html>
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