Sidescan sonar polyline shapefile of trackline navigation files collected by the U.S. Geological Survey in the Madison Swanson and Steamboat Lumps Marine Protected Areas, Gulf of Mexico in 2000 (Geographic, WGS 84)

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Frequently anticipated questions:


What does this data set describe?

Title:
Sidescan sonar polyline shapefile of trackline navigation files collected by the U.S. Geological Survey in the Madison Swanson and Steamboat Lumps Marine Protected Areas, Gulf of Mexico in 2000 (Geographic, WGS 84)
Abstract:
The U.S. Geological Survey (USGS) mapped approximately 22 square miles of the Madison Swanson Marine Protected Area (MPA) and Steamboat Lumps MPA, which are located on the Florida shelf edge in the northeastern Gulf of Mexico in 2000 using sidescan sonar and high-resolution chirp seismic-reflection systems. This survey was conducted as part of a larger study of the effectiveness of no-fishing reserves in protecting grouper spawning aggregations. Field activity information for this cruise is available on-line through the U.S. Geological Survey Coastal and Marine Geoscience Data System at https://cmgds.marine.usgs.gov/fan_info.php?fa=2000-005-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, 2016, Sidescan sonar polyline shapefile of trackline navigation files collected by the U.S. Geological Survey in the Madison Swanson and Steamboat Lumps Marine Protected Areas, Gulf of Mexico in 2000 (Geographic, WGS 84): data release DOI:10.5066/F7JD4TVC, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Scanlon, Kathryn M., and Buczkowski, Brian J., 2016, High-resolution geophysical data collected in the Madison Swanson and Steamboat Lumps Marine Protected Areas, Gulf of Mexico in 2000, U.S. Geological Survey Field Activity 2000-005-FA: data release DOI:10.5066/F7JD4TVC, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -85.847694
    East_Bounding_Coordinate: -84.593269
    North_Bounding_Coordinate: 29.283691
    South_Bounding_Coordinate: 28.048441
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data/field-activity-data/2000-005-FA/data/backscatter/2000-005-FA_sss_navtracks_lg.png (PNG)
    Browse graphic showing the tracklines of 2000-005-FA sidescan sonar data.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 15-Feb-2000
    Ending_Date: 02-Mar-2000
    Currentness_Reference:
    ground condition during 20000215 - 20000302
  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):
      • String (156)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. 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?
    FA-2000-005_sss_navtracks
    Shapefile Attribute Table (Source: Esri)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: Esri) Coordinates defining the features.
    LineID
    Text field that matches the prefix of the QMIPS navigation file that was used to create this dataset. Line numbers typically start with L, then the line number, and then F*, where the asterisks represents the part of that line. Most lines only have 1 part. (Source: U.S. Geological Survey) Character set.
    Lat
    Latitude coordinate of the start of the line in decimal degrees. (Source: U.S. Geological Survey)
    Range of values
    Minimum:28.048441
    Maximum:29.283636
    Units:decimal degrees
    Long
    Longitude coordinate of the start of the line in decimal degrees. (Source: U.S. Geological Survey)
    Range of values
    Minimum:-85.84137
    Maximum:-84.603386
    Units:decimal degrees
    JDTime
    Text field representing Julian day and time of the start of the line in the format JJJ:HH:MM:SS for JJJ is Julian day, HH is hour, MM is minute, and SS is second. Time is UTC time. (Source: U.S. Geological Survey) Character set.
    Year
    The year of the survey. (Source: U.S. Geological Survey)
    Range of values
    Minimum:2000
    Maximum:2000
    Units:year
    Survey
    The field activity identifier in the format YYYY-NNN-FA where YYYY is the year, NNN is the survey number in that year, and FA stands for Field Activity. (Source: U.S. Geological Survey) Character set.
    Lat_end
    Latitude coordinate of the end of the line in decimal degrees. (Source: U.S. Geological Survey)
    Range of values
    Minimum:28.052017
    Maximum:29.283636
    Units:decimal degrees
    Long_end
    Longitude coordinate of the end of the line in decimal degrees. (Source: U.S. Geological Survey)
    Range of values
    Minimum:-85.84137
    Maximum:-84.603386
    Units:decimal degrees
    JDTime_end
    Text field representing Julian day and time of the end of the line in the format JJJ:HH:MM:SS for JJJ is Julian day, HH is hour, MM is minute, and SS is second. Time is UTC time. (Source: U.S. Geological Survey) Character set.
    Entity_and_Attribute_Overview:
    Each ASCII navigation file has 8 columns of information separated by whitespace. In all files, these columns (in order) are Julian Day, hour, minute, second, latitude degrees, latitude decimal minutes, longitude degrees, longitude decimal minutes. The times recorded are UTC times.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

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?
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Kathryn M. Scanlon
    Research Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x 2323 (voice)
    508-457-2310 (FAX)
    kscanlon@usgs.gov

Why was the data set created?

These data represent the navigation associated with each line of sidescan-sonar data collected during USGS field activity 2000-005-FA.

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: 2000 (process 1 of 9)
    The SIS 1000 towfish by Datasonics was used to collect all of the sidescan-sonar data at a 400 meter total swath width. The data were recorded using ISIS by Triton Elics International in QMIPS format. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 2000 (process 2 of 9)
    XSonar processing software (Danforth and others, 1991) was used to process the sidescan sonar QMIPS files. The files were demultiplexed using a 4x3 sample interval and a normalization value of 8192. One result of the demultiplexing of the QMIPS file is the output navigation file with fixes approximately every 2 minutes.
    
    
    Danforth, W. W., T. F. O'Brien, and W. C. Schwab. 1991. US Geological Survey Image Processing System: Near Real-Time Mosaicking of High-Resolution Sidescan-Sonar Data. Sea Technology, Jan. 1991: 54-59. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: Aug-2015 (process 3 of 9)
    The individual survey areas are grouped into folders - Control, MadSwan, Steam, and Transit. A PYTHON script was written to access each folder and process the individual files to convert them to comma-delimited text files with the navigation as decimal degrees. A second PYTHON script was written to take this text file and convert it to a shapefile outside of ArcGIS using the shapefile.py class file. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Kyle Laramee
    volunteer
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 (voice)
    508-457-2310 (FAX)
    Contact_Instructions: Working with VeeAnn A. Cross.
    Data sources used in this process:
    • *.NAV
    Data sources produced in this process:
    • testnav1.csv
    • FA-2000-005_sss_navpnts.shp
    Date: Aug-2015 (process 4 of 9)
    ArcMap 9.3.1, ArcToolbox (Data Management Tools - Projections and Transformations - Define Projection) tool was used to define the projection as Geographic, WGS 84. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    VeeAnn A. Cross
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Data sources used in this process:
    • FA-2000-005_sss_navpnts.shp
    Data sources produced in this process:
    • FA-2000-005_sss_navpnts.shp
    Date: Aug-2015 (process 5 of 9)
    In ArcMap 9.3.1, VACXtras (v 3.1.2) Point to Line v2 was used to convert the navigation point shapefile to a polyline shapefile with the LineID as the line delimiter. VACXtras is a collection of Visual Basic tools used in the Woods Hole Coastal and Marine Science Center written by VeeAnn A. Cross. The tool enables the user to store attributes from the input point shapefile into the output polyline shapefile. In this case, for the start of the line, the Lat, Long, JDTime, Year, and Survey attribute values were carried over. For the end of the line, the Lat, Long, and JDTime attributes were carried over (as Lat_end, Long_end, and JDTime_end). An automatically generated attribute, Id, which serves no usable function in this case - was deleted from the shapefile. Data sources used in this process:
    • FA-2000-005_sss_navpnts.shp
    Data sources produced in this process:
    • FA-2000-005_sss_navtracks.shp
    Date: 16-Oct-2015 (process 6 of 9)
    Filename was changed to more precisely reflect the field activity number. Data sources used in this process:
    • FA-2000-005_sss_navtracks.shp
    Data sources produced in this process:
    • 2000-005-FA_sss_navtracks.shp
    Date: 06-Apr-2017 (process 7 of 9)
    The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 8 of 9)
    USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 9 of 9)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Capone, Mark, Scanlon, Kathryn M., and Swift, B. Ann, 2002, Archive of Chirp Subbottom Data Collected During USGS Cruise ORGN00005, Northeastern Gulf of Mexico, 15 February - 2 March, 2000: Open-File Report 2002-045, U.S. Geological Survey, Reston, VA.

    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?
    Differential GPS, with an Ashtech BR2G beacon receiver, was used to navigate the ship. The towfish navigation system was a Benthos DS 7000 acoustic deck set that used range to towfish to account for layback of the towfish. The position of the towfish was corrected using HYPAK 8.9 and ISIS software. The range to fish did not always work well. The assumed approximate horizontal offset is 20-30 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    These files represent all of the sidescan sonar navigation extracted from QMIPS files during USGS field activity 2000-005-FA. The only navigation files not included are the navigation files from test lines.
  5. How consistent are the relationships among the observations, including topology?
    These are the navigation files extracted from the QMIPS sidescan sonar data.

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 are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. These data are not to be used for navigation.
  1. Who distributes the data set? (Distributor 1 of 1)
    Brian J. Buczkowski
    U.S. Geological Survey
    Physical Scientist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2361 (voice)
    508-457-2310 (FAX)
    bbuczkowski@usgs.gov
  2. What's the catalog number I need to order this data set? The 2000-005-FA_sss_linenav.zip file contains the 2000-005-FA_sss_navtracks.shp and the other shapefile components. In addition to the shapefile, the zip file also contains the FGDC CSDGM metadata in the following formats: XML, HTML, and text.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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?
  5. What hardware or software do I need in order to use the data set?
    This WinZip file contains the polyline shapefile and associated metadata files. To utilize these data, the user must have software capable of viewing the shapefile. This shapefile filename starts with a number and has dashes in it. This filename may not work with some geoprocessing or ArcPy scripts and may need to be renamed.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Brian J. Buczkowski
U.S. Geological Survey
Physical Scientist
384 Woods Hole Road
Woods Hole, Massachusetts
USA

508-548-8700 x2361 (voice)
508-457-2310 (FAX)
bbuczkowski@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/field_activities/2000_005_fa/2000-005-FA_sss_navtracksmeta.faq.html>
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