Multibeam Mapping of Pulley Ridge, Gulf of Mexico, Key West, Florida

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Frequently anticipated questions:


What does this data set describe?

Title:
Multibeam Mapping of Pulley Ridge, Gulf of Mexico, Key West, Florida
Abstract:
XYZ ASCII format high-resolution bathymetry data generated from the 2003, 2007, and 2009 combined multibeam sonar survey of Pulley Ridge, Gulf of Mexico, Key West, Florida.
Supplemental_Information:
Resource Description: Downloadable Data. Cruise dates R/V Suncoaster in 2003, 2007, and the R/V Weatherbird II in 2009 required.
  1. How should this data set be cited?

    Naar, Dr. David , 201111, Multibeam Mapping of Pulley Ridge, Gulf of Mexico, Key West, Florida.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -83.919309
    East_Bounding_Coordinate: -83.736908
    North_Bounding_Coordinate: 24.854269
    South_Bounding_Coordinate: 24.709229

  3. What does it look like?

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

    Calendar_Date: 2003
    Time_of_Day: Unknown
    Currentness_Reference: ground condition

  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?

      Indirect_Spatial_Reference:
      Multibeam Mapping of Pulley Ridge, Gulf of Mexico, Key West, Florida
      This is a Point data set.

    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 0.00002. Longitudes are given to the nearest 0.00002. Latitude and longitude values are specified in Decimal Degrees.

      The horizontal datum used is WGS 84.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/0.0033528106647475.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean sea level
      Depth_Resolution: 0.01
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute Values

  7. How does the data set describe geographic features?


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?

    Leigh Hedgepeth ENS/NOAA 3500 Delwood Beach Rd. Panama City Beach, FL 32408 (850) 234-6541 ext. 212 Leigh.hedgepeth@noaa.gov

    Dr. David F Naar Associate Professor University of South Florida, College of Marine Science 140 7th Avenue South St. Petersburg, Florida 33701-5016 USA

    (727) 553 1637 (voice) (727) 553 1189 (FAX) naar@usf.edu

  3. To whom should users address questions about the data?

    David Naar
    University of South Florida, College of Marine Science
    Associate Professor of Marine Geophysics
    140 7th Avenue South
    St. Petersburg, Florida 33701-5016
    USA

    (727) 553 1637 (voice)
    (727) 553 1189 (FAX)
    naar@usf.edu


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 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: Unknown (process 1 of 1)
    Bathymetric data were post-processed using CARIS HIPS ver. 7.0 hydrographic data cleaning system software. Soundings were corrected for vessel motion using Kongsberg Seatex Motion Reference Unit (MRU), variations in water column sound velocity using Applied Microsystems smartSVP data, and adjusted for variations in water height (tides) using vertical position data from Kongsberg Seatex. Post-survey data cleaning, as well as Bathymetry Associated with Statistical Error (BASE) Surface creation using swath angle algorithm, were applied by CMWS. CMWS created final products from these post-processed multibeam bathymetry data. Soundings (xyz) were exported from a BASE Surface as an xyz text file. The xyz were imported into Fledermaus Dmagic ver. 7.1 to grid. In Dmagic, the 1m decimated xyz text files were interpolated into digital elevation model (DEM) grids. The Fledermaus grids were exported as ArcInfo ASCII raster files (.asc), which were converted into bathymetry ArcInfo grids in ArcGIS. Final x,y,z soundings, surface models, and derived products are relative to the WGS84 datum.

    Person who carried out this activity:

    David Naar
    University of South Florida, College of Marine Science
    Associate Professor of Marine Geophysics
    140 7th Avenue South
    St. Petersburg, Florida 33701-5016
    USA

    (727) 553 1637 (voice)
    (727) 553 1189 (FAX)
    naar@usf.edu

  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?

    No accuracy assessment was completed for this dataset. The instruments involved are capable of x and y position accuracy of 1cm, heading accuracy of 0.05% and roll and pitch accuracy of 0.03%.

    No tidal correction was made to the data. The instruments involved are capable of a z position accuracy of 2cm and heave accuracy of 5% or 5cm.

  2. How accurate are the geographic locations?

    No accuracy assessment was completed for this dataset. The instruments involved are capable of x and y position accuracy of 1cm, heading accuracy of 0.05% and roll and pitch accuracy of 0.03%.

  3. How accurate are the heights or depths?

    No tidal correction was made to the data. The instruments involved are capable of a z position accuracy of 2cm and heave accuracy of 5% or 5cm.

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

    As much data was collected as possible within the time constraints of the cruise.

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

    The data are approximately set at a Mean Sea Level Chart datum but are not tide corrected, because tidal variation is a small percent (<0.01%) compared to the total depth. The tidal range is also less than the total accuracy of the data along these single transits and thus any slight offset is not observable within the data.

    The data crossing over a previous NOAA multibeam survey matched at 99% of total depth. Lead weight harbor verifications were done in both Key West and Pascagoula matching within 5 cm.

    Point features present. Similar scarps and bioherms were observed with the new data as was visible in the previous data collected by NOAA in a systematic survey along the slope of the west shelf of Florida in depths ranging from 300 to 700 meters.


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 University of South Florida as the source of this information.

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

    David Naar
    University of South Florida, College of Marine Science
    Associate Professor of Marine Geophysics
    140 7th Avenue South
    St. Petersburg, Florida 33701-5016
    USA

    (727) 553 1637 (voice)
    (727) 553 1189 (FAX)
    naar@usf.edu

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

    Offline Data

  3. What legal disclaimers am I supposed to read?

    These data not intended for navigational purposes.

    Although these data have been used by the University of South Florida, College of Marine Science, 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 University of South Florida or the State of Florida 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-University of South Florida products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the University of South Florida or the State of Florida, as to their suitability, content, usefulness, functioning, completeness, or accuracy.

    Disclaimer- While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    Distributed by: Dr. David F Naar University of South Florida, College of Marine Science 140 7th Avenue South St. Petersburg, FL 33701-5016 USA

    (727) 553 1637 (voice)

    Availability in digital form: Data format: ASCII, GeoTIFF, ESRI, CARIS, or KSI raw format Network links: N/A

    Cruise dates 9-Nov-2011 through 11-Nov-2011 required.

    Cost to order the data: None

  6. What hardware or software do I need in order to use the data set?

    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 data of the West Florida Shelf, Gulf of Mexico.


Who wrote the metadata?

Dates:
Last modified: 20-Dec-2012
Last Reviewed: 06-Dec-2011
Metadata author:
NOAA NMFS Panama City Laboratory
Attn: Leigh Hedgepeth
Marine Protected Area GIS Specialist
3500 Delwood Beach Rd
Panama City Beach, FL 32408
USA

850-234-6541 ex. 212 (voice)
850-235-3559 (FAX)
leigh.hedgepeth@noaa.gov

Hours_of_Service: 0700-1500 M-F
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.13 on Wed Apr 23 10:39:42 2014