Multibeam Mapping of the West Florida Shelf, Gulf of Mexico

Metadata also available as

Frequently-anticipated questions:

What does this data set describe?
    Title: Multibeam Mapping of the West Florida Shelf, Gulf of Mexico
    Abstract:
    ArcInfo GRID format data generated from the 2001 multibeam sonar survey of the West Florida Shelf, Gulf of Mexico. The data include high-resolution bathymetry and calibrated acoustic backscatter.
    Supplemental_Information:
    Information for USGS Coastal and Marine Geology related activities are online at <http://walrus.wr.usgs.gov/infobank/m/m201gm/html/m-2-01-gm.meta.html>

  1. How should this data set be cited?

    United States Geological Survey, Coastal and Marine Geology (CMG), Chief, 2001, Multibeam Mapping of the West Florida Shelf, Gulf of Mexico.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -86.7166667
    East_Bounding_Coordinate: -84.5833333
    North_Bounding_Coordinate: 31.0833333
    South_Bounding_Coordinate: 28.0000000

  3. What does it look like?

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

    Beginning_Date: 03-Sep-2001
    Ending_Date: 12-Oct-2001
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: ArcInfo GRID

  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, type Grid Cell

    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: 0.9996
      Longitude_of_Central_Meridian: -87.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 0.00
      False_Northing: 0.00

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 8.0
      Ordinates (y-coordinates) are specified to the nearest 8.0
      Planar coordinates are specified in Meters

      The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.00 meters.
      The flattening of the ellipsoid used is 1/0.003352811.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    NBATHYG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5643 Number of Columns = 6740

    BOUNDARY Xmin = 527624.036 Xmax = 581544.036 Ymin = 3281094.779 Ymax = 3326238.779

    STATISTICS Minimum Value = -129.937 Maximum Value = -46.920 Mean = -90.947 Standard Deviation = 19.106

    NMOSG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5641 Number of Columns = 6736

    BOUNDARY Xmin = 527640.055 Xmax = 581528.055 Ymin = 3281094.860 Ymax = 3326222.860

    STATISTICS Minimum Value 115.000 Maximum Value = 243.556 Mean = 192.089 Standard Deviation = 7.428

    CBATHYG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 7091 Number of Columns = 8142

    BOUNDARY Xmin = 556226.086 Xmax = 621362.086 Ymin = 3225095.066 Ymax = 3281823.066

    STATISTICS Minimum Value -188.700 Maximum Value = -50.481 Mean = -101.783 Standard Deviation = 31.205

    CMOSG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 7091 Number of Columns = 8141

    BOUNDARY Xmin = 556234.118 Xmax = 621362.118 Ymin = 3225095.105 Ymax = 3281823.105

    STATISTICS Minimum Value 151.000 Maximum Value = 253.959 Mean = 191.949 Standard Deviation = 8.260

    SBATHYG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5808 Number of Columns = 8270

    BOUNDARY Xmin = 592166.910 Xmax = 658326.910 Ymin = 3193583.705 Ymax = 3240047.705

    STATISTICS Minimum Value -188.390 Maximum Value = -48.146 Mean = -123.580 Standard Deviation = 32.989

    SMOSG is an ArcInfo GRID with the following attributes: Cell Size = 8.000 Data Type: Floating Point Number of Rows = 5410 Number of Columns = 8263

    BOUNDARY Xmin = 592223.251 Xmax = 658327.251 Ymin = 3196771.514 Ymax = 3240051.514

    STATISTICS Minimum Value 151.000 Maximum Value = 250.000 Mean = 190.437 Standard Deviation = 8.699

    SBBATHYG is an ArcInfo GRID with the following attributes: Cell Size = 4.000 Data Type: Floating Point Number of Rows = 5654 Number of Columns = 5107

    BOUNDARY Xmin = 714201.893 Xmax = 734629.893 Ymin = 3104250.423 Ymax = 3126866.423

    STATISTICS Minimum Value -152.840 Maximum Value = -68.994 Mean = -89.114 Standard Deviation = 17.127

    SBMOSG is an ArcInfo GRID with the following attributes: Cell Size = 4.000 Data Type:Floating Point Number of Rows = 5648 Number of Columns = 5105

    BOUNDARY Xmin = 714201.893 Xmax = 734621.893 Ymin = 3104265.597 Ymax = 3126857.597

    STATISTICS Minimum Value 161.000 Maximum Value = 251.000 Mean = 195.320 Standard Deviation = 4.010

    Entity_and_Attribute_Detail_Citation: none

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?

    Peter Dartnell
    United States Geological Survey (USGS)
    Physical Scientist
    USGS, 400 Natural Bridges Drive
    Santa Cruz, CA 95060
    USA

    831-460-7415 (voice)
    (831-427-4748 (FAX)
    pdartnell@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) or other software to display bathymetry and backscatter data of the West Florida Shelf, Gulf of Mexico.

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: 12-Oct-2001 (process 1 of 1)
    The bathymetry and backscatter data were collected along a continuous swath perpendicular to the direction of the ship using a Kongsberg Simrad EM1002 multibeam sonar system. The data are cleaned of bad navigation and depth readings. The depth readings are gridded into a common grid. The gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command.

    Person who carried out this activity:

    Peter Dartnell
    United States Geological Survey (USGS)
    Physical Scientist
    USGS, 400 Natural Bridges Drive
    Santa Cruz, CA 95060
    USA

    831-460-7415 (voice)
    (831-427-4748 (FAX)
    pdartnell@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?

    Not applicable for raster data.

  2. How accurate are the geographic locations?

    0.5 meters

  3. How accurate are the heights or depths?

    0.05 percent of the water depth

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

    Complete

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

    Unspecified

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:

Please recognize the U.S. Geological Survey (USGS) as the source of this information. USGS-authored or produced data and information are in the public domain.

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

    United States Geological Survey (USGS)
    Box 25286
    Denver, CO 80225
    USA

    (888)ASK-USGS (voice)

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

    M-01-GM data set

  3. What legal disclaimers am I supposed to read?

    These data not intended for navigational purposes.

    Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.

    Neither the U.S. Government nor any agency thereof, 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 data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.

    Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

  4. How can I download or order the data?

Who wrote the metadata?
Dates:
Last modified: 30-Oct-2001

Metadata author:
Peter Dartnell
United States Geological Survey (USGS)
Physical Scientist
USGS, 400 Natural Bridges Drive
Santa Cruz, CA 95060
USA

831-460-7415 (voice)
(831-427-4748 (FAX)
pdartnell@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)

Generated by mp version 2.7.9 on Tue Dec 4 13:10:57 2001