10cct01_v2rbf_50m.tif: 50-Meter Resolution Grid of Swath Bathymetry Data Collected Offshore of Cat Island, Mississippi in March 2010

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Frequently anticipated questions:

What does this data set describe?

Title:
10cct01_v2rbf_50m.tif: 50-Meter Resolution Grid of Swath Bathymetry Data Collected Offshore of Cat Island, Mississippi in March 2010
Abstract:
In March of 2010, the U.S. Geological Survey (USGS) conducted geophysical surveys east of Cat Island, Mississippi. The efforts were part of the USGS 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 geological stratigraphic framework of the Mississippi Barrier Island Complex. The data collected will be used to create baseline bathymetry information that will address seafloor change. This report contains swath bathymetry and side scan sonar data collected aboard the R/V Survey Cat during Cruise 10CCT01. A combination of software packages was used to process and grid the data. This data series describes the methodology used and the resulting data projects.
Supplemental_Information:
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 geomorpholocial 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 provide protection for the historical Fort Massachusetts. For more information refer to <http://ngom.usgs.gov/gomsc/mscip/index.html>. The USGS St. Petersburg Coastal and Marine Science Center assigns a unique identifier to each cruise or field activity. For example, 10CCT01 tells us the data were collected in 2010 for the Coastal Change and Transport (CCT) study and the data were collected during the first 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 a 26-foot Glacier Bay Catamaran. Side scan sonar and interferometric swath bathymetry data were collected simultaneously along the tracklines. The side scan sonar towfish was towed off the port side just slightly behind the vessel, close to the seafloor. The interferometric swath transducer was sled-mounted on a rail attached between the catamaran hulls. During the survey the sled is secured into position. Navigation was acquired with a CodaOctopus Octopus F190 Precision Attitude and Positioning System and differentially corrected with OmniSTAR. See the digital FACS equipment log for details about the acquisition equipment used. Both raw datasets were stored digitally and processed using SEA's Ltd. Swath Processor version 3.07 and CARIS HIPS and SIPS software version 7.0 in the St. Petersburg office. For more information on processing, refer to the Equipment and Processing page. Post-processing of the swath dataset revealed a motion artifact that is attributed to movement of the pole that the transducers are attached to in relation to the boat. The survey was forced to take place in the winter months, in which strong winds and rough waves contributed to a reduction in data quality. The rough seas contributed to both the movement of the pole and the very high noise base seen in the raw amplitude data of the side scan sonar. Chirp data were also collected during this survey and are archived separately.
  1. How might this data set be cited?
    U.S. Geological Survey, DeWitt, Nancy T., Flocks, James G., Pfeiffer, William R., and Wiese, Dana S., 2010, 10cct01_v2rbf_50m.tif: 50-Meter Resolution Grid of Swath Bathymetry Data Collected Offshore of Cat Island, Mississippi in March 2010: U.S. Geological Survey Data Series 563, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -89.073360
    East_Bounding_Coordinate: -88.956940
    North_Bounding_Coordinate: 30.285989
    South_Bounding_Coordinate: 30.203957
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 09-Mar-2010
    Beginning_Time: unknown
    Ending_Date: 17-Mar-2010
    Ending_Time: unknown
    Currentness_Reference:
    data collection interval
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  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 178 x 221 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: -87.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 50
      Ordinates (y-coordinates) are specified to the nearest 50
      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 1/298.25722356300003.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean lower low water
      Depth_Resolution: 0.05
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    10cct01_v2_50m_grid.tif
    ESRI ArcGIS 9.3 (Source: ESRI ArcMap 9.3 TIFF)
    10cct01_v2rbf_50m_raster2point.shp
    ESRI ArcGIS 9.3 (Source: ESRI ArcMap 9.3 shapefile)
    FID
    Internal feature number. (Source: ESRI ArcGIS 9.3) Sequential unique whole numbers that are automatically generated.
    SHAPE
    Point Geometry (Source: ESRI ArcGIS 9.3) Sequential unique whole numbers that are automatically generated.
    POINT_ID
    Number (Source: ESRI ArcGIS 9.3)
    Range of values
    Minimum:1
    Maximum:20773
    GRID_CODE
    Depth in meters (Source: USGS)
    Range of values
    Minimum:-1.30
    Maximum:-12.33
    X
    WGS84 UTM 16N (Source: World Geodtic System of 1984)
    Range of values
    Minimum:300605
    Maximum:611605
    Y
    WGS84 UTM 16N (Source: World Geodtic System of 1984)
    Range of values
    Minimum:3343225
    Maximum:3352075
    10cct01_v2rbf_50m_raster2ascii.txt
    ESRI ArcGIS 9.3 (Source: ESRI ArcMap 9.3 ASCII file)
    Entity_and_Attribute_Overview:
    10cct01_v2rbf_50m.tif is the final, processed 50-m resolution swath bathymetry grid exported as a GeoTIFF file.
    Entity_and_Attribute_Detail_Citation: <http://ngom.usgs.gov/gomsc/mscip/index.html>
    Entity_and_Attribute_Overview:
    10cct01_v2rbf_50m_raster2point.shp is 10cct01_v2rbf_50m.tif converted to a point shapefile. The shapefile was created using ArcMap version 9.3.1 raster to point conversion tool and the then populated with XY fields using XToools Pro version 6.0. The attributes for this file are listed in the entity and attribute section.
    Entity_and_Attribute_Detail_Citation: <http://ngom.usgs.gov/gomsc/mscip/index.html>
    Entity_and_Attribute_Overview:
    10cct01_v2rbf_50m_raster2ascii.txt is 10cct01_v2rbf_50m.tif converted to a ASCII shapefile. The text file was created using ArcMap version 9.3.1 raster to ascii conversion tool. This text file is in an array format with header information at the top of the file.
    Entity_and_Attribute_Detail_Citation: <http://ngom.usgs.gov/gomsc/mscip/index.html>

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
    • Nancy T. DeWitt
    • James G. Flocks
    • William R. Pfeiffer
    • Dana S. Wiese
  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?
    Nancy T. DeWitt
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 x3058 (voice)
    ndewitt@usgs.gov

Why was the data set created?

This report serves as an archive of the processed swath bathymetry and side scan sonar data. Data products herein include gridded and interpolated surfaces, surface images, and x,y,z data products for both swath bathymetry and side scan sonar imagery. Additional files include trackline maps, navigation files, GIS files, Field Activity Collection System (FACS) logs, and formal FGDC metadata. Scanned images of the handwritten FACS logs are also provided as PDF files. Refer to the Acronyms page for expansion of acronyms and abbreviations used in this report.

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: 30-Sep-2010 (process 1 of 4)
    The SWATHplus raw data files (SXR) were processed using SEA Swath Processor version 3.07 to create SEA Swath Processed data files (SXP) and then imported into CARIS HIPS and SIPS version 7.0. The data were tidally corrected in CARIS HIPS and SIPS using a tide zone model supplied by NOAA with the verified tide data from Pascagoula, MS, station ID 8741533 and Gulfport, MS, station ID 8745557. The Swath Editor within the HIPS package was used to edit the data on a ping-by-ping basis, both in across- and along-track dimension. Spurious or erroneous data were removed. The HIPS software was used to create a BASE (Bathymetry Associated with Statistical Error) surface similar to a weighted grid at-10 m grid cell size. The 10-m BASE surface was exported to an ASCII file as x,y,z. The ASCII file was imported into ESRI's ArcMap version 9.3.1 and gridded using the Geostatistical Analyst Tool's radial basis functions. Person who carried out this activity:
    Nancy T. DeWitt
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 x3058 (voice)
    ndewitt@usgs.gov
    Date: 2010 (process 2 of 4)
    This is the completed 50-m resolution grid of swath bathymetric data exported as point data. This shapefile is raster grid 10cct01_v2rbf_50m.tif converted to point data using ArcMap version 9.3.1 raster to point conversion tool. The table produced was then populated with XY fields using XToools Pro version 6. Person who carried out this activity:
    Nancy T. DeWitt
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 x3058 (voice)
    ndewitt@usgs.gov
    Date: 27-Mar-2018 (process 3 of 4)
    Keywords section of metadata optimized by adding theme keyword thesauri and associated keywords. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Arnell S. Forde
    Geologist
    600 4th Street South
    St. Petersburg, FL

    727-502-8000 (voice)
    aforde@usgs.gov
    Date: 13-Oct-2020 (process 4 of 4)
    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?

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 is complete and 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 sled-mounted between the catamaran pontoons. Offsets between the sonar head and the DGPS antennas were measured and entered into the F190 internal setup program. DGPS is always implemented for navigational accuracy. DGPS is normally provided through the OmniSTAR High Performance wide area GPS service unless otherwise noted. All swath bathymetry data was collected using the SEA Ltd., SWATHplus interferometric sonar system. All side scan sonar data was collected using the Klein 3900 system.
  2. How accurate are the geographic locations?
    The ship was navigated using Differential Global Positioning System (DGPS) obtained with the CodaOctopus Octopus F190 Precision Attitude and Positioning System using the F80 Series Windows software version 4.0.5. Two antennas received the integrated OmniSTAR differential correction. Unless noted, all DGPS data are referenced to WGS84. The swath transducer sonar head was sled-mounted between the catamaran pontoons. Offsets between the sonar head and the DGPS antennas were measured and entered into the F190 internal setup program. The horizontal accuracy of side scan sonar data is at the limit of OmniSTAR, which is within 20 cm.
  3. How accurate are the heights or depths?
    Ship motion was measured using a the CodaOctopus Octopus F190 Precision Attitude and Positioning System. The interferometric sonar is an angle-measuring system; depth accuracy decreases with increasing horizontal range. The swath width of the interferometric sonar varied as a function of depth but generally achieved 5 times the water depth. Vertical accuracy is directly affected by the accuracy of both the navigation system and tidal measurments. A tidal zone model was supplied by NOAA and applied to the data referencing it to MLLW. Verified tide data from the Pascagoula, MS, station ID 8741533 and Gulfport, MS, station ID 8745557 were used with the model. Errors with the tidal zone model may be similar to the tidal zone range for this area, which is ~0.40 m. However, local effects in shallow waters like wind, waves, and storms may have an effect on the range in the short term. During the days of this survey simple average statistics of the verified tide data from both tide stations was a low of -0.15 m to a high of +0.33 m with a range of 0.48 m.
  4. Where are the gaps in the data? What is missing?
    This is a completed processed swath bathymetry surface in GeoTIFF format. This data provides a continuous and complete surface, however 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.
  5. How consistent are the relationships among the observations, including topology?
    his dataset 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:
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
Use_Constraints: These data are not to be used for navigation
  1. Who distributes the data set? (Distributor 1 of 3)
    Jim Flocks
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 x3012 (voice)
    jflocks@usgs.gov
  2. What's the catalog number I need to order this data set? 10cct01_v2rbf_50m.tif
  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, 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. 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, 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?
  5. Is there some other way to get the data?
    none
  6. What hardware or software do I need in order to use the data set?
    This shapefile was created for use with ESRI ArcGIS software.
  1. Who distributes the data set? (Distributor 2 of 3)
    Jim Flocks
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 x3012 (voice)
    jflocks@usgs.gov
  2. What's the catalog number I need to order this data set? 10cct01_v2rbf_50m_raster2point.shp
  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, 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. 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, 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?
  5. Is there some other way to get the data?
    none
  6. What hardware or software do I need in order to use the data set?
    This shapefile was created for use with ESRI ArcGIS software.
  1. Who distributes the data set? (Distributor 3 of 3)
    Jim Flocks
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 803-8747 x3012 (voice)
    jflocks@usgs.gov
  2. What's the catalog number I need to order this data set? 10cct01_v2rbf_50m_raster2ascii.txt
  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, 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. 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, 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?
  5. Is there some other way to get the data?
    none
  6. What hardware or software do I need in order to use the data set?
    This shapefile was created for use with ESRI ArcGIS software.

Who wrote the metadata?

Dates:
Last modified: 22-Sep-2021
Metadata author:
Nancy T. DeWitt
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Geologist
600 4th Street South
St. Petersburg, FL
USA

(727) 803-8747 x3058 (voice)
ndewitt@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/DS_563_v2rbf.faq.html>
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