Pulley Ridge Swath Bathymetry Grid - unfiltered

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Frequently-anticipated questions:

What does this data set describe?

Title: Pulley Ridge Swath Bathymetry Grid - unfiltered
Abstract:
Pulley Ridge is a series of drowned barrier islands that extends almost 200 km in 60-100 m water depths. This drowned ridge is located on the Florida Platform in the southeastern Gulf of Mexico about 250 km west of Cape Sable, Florida. This barrier island chain formed during the initial stage of the Holocene marine transgression. These islands were then submerged and left abandoned near the outer edge of the Florida Platform. The southern portion of Pulley Ridge hosts zooxanthellate scleractinian corals, green, red and brown macro algae, and a mix of deep and typically shallow-water tropical fishes. This reef community is in unusually deep water, and its extent and the controls on its distribution were unknown. To address these questions scientists from the U.S. Geological Survey Coastal and Marine Geology Program in cooperation with scientists from the University of South Florida Department of Marine Sciences have completed a detailed mapping of the southernmost 35 km of Pulley Ridge. The area was mapped using multibeam bathymetry, sidescan-sonar imagery, and high-resolution seismic-reflection profiling to define the geologic framework on which the reef is established. Submersible dives, remotely operated vehicle (ROV) transects, and transects of bottom photographs and video were collected to identify the corals and to map their distribution. This extensive suite of data has been compiled and preliminary analysis of the data suggests that the reefs are not tied to the ridge system, but instead are more broadly distributed. Whether reef distribution is controlled by oceanographic conditions or by subtle differences in the substrate that overlies the barrier island system is unclear, and are topics of continued research.
  1. How should this data set be cited?

    Halley, Robert B. , 2005, Pulley Ridge Swath Bathymetry Grid - unfiltered:.

    Online Links:

    This is part of the following larger work.

    Cross, VeeAnn A. , Twichell, David C. , Halley, Robert B. , Ciembronowicz, Kate T. , Jarrett, Bret D. , Hammar-Klose, Erika S. , Hine, Al C. , Locker, Stan D. , and Naar, Dave F. , 2005, GIS Compilation of Data Collected from the Pulley Ridge Deep Coral Reef Region: Open-File Report 2005-1089, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -83.792254
    East_Bounding_Coordinate: -83.591486
    North_Bounding_Coordinate: 25.000776
    South_Bounding_Coordinate: 24.671257

  3. What does it look like?

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

    Calendar_Date: Apr-1999
    Currentness_Reference: ground condition

  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 7228 x 3919 x 1, 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: 17
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -81.000000
      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 5.000000
      Ordinates (y-coordinates) are specified to the nearest 5.000000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  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?

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

    Robert B. Halley
    U.S. Geological Survey
    Geologist
    USGS Center for Coastal and Watershed Studies
    St. Petersburg, FL 33701-4846

    (727) 803-8747 x3113 (voice)
    (727) 803-2032 (FAX)
    rhalley@usgs.gov

Why was the data set created?

To provide high-resolution bathymetry for the Pulley Ridge study area.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    Source_Contribution:
    Multibeam bathymetry was collected with a Kongsberg Simrad EM3000 system. This dataset represents 4 years of data collection. 1999 data collected April 26-27 aboard the Florida Institute of Oceanography (FIO) R/V Bellows. 2000 data collected May 9-10 aboard FIO's R/V Suncoaster. 2001 data collected September 5-10 aboard FIO's R/V Suncoaster. 2003 data collected April 24-29 aboard FIO's R/V Suncoaster.

  2. How were the data generated, processed, and modified?

    Date: 2004 (process 1 of 8)
    All raw data files were processed with CARIS HIPS (Hydrographic Information Processing System) version 5.3 with the following workflow: a) created vessel configuration file (VCF) for each cruise. Initial roll, yaw, pitch, and x,y,z axis parameters were set to zero. This information was incorporated into the data at the time of collection as the installation parameters. b) created a new project directory for the HIPS data. This data set was broken down by year. The 2000 data was added to the 1999 data and made into one project, but the other years each have their own projects and field sheets. c) raw line files from em3000 software were brought into CARIS conversion wizard. The conversion wizard converts raw data files to HIPS format and saves the files to a project directory. d) each line was evaluated with the navigation editor to clean the vessel's navigation data. Two know jumps in speed were searched for and the position fixes along with the fixes before and after were rejected with interpolation. The lines were also evaluated with attitude editor to view and clean the motion sensor data like heave and roll. e) a tide file was created for each cruise using a model created by Ruoying He in the Ocean Circulation Group at the Univ. of South Florida (see cross reference section for reference). f) All lines were then merged to create position/depth data for each sounding. g) filters were created for each survey and set to: min depth 40 m, max depth 115 m (as requested by researchers), nadir depth 3.2, angle form nadir 65 degrees port and starboard. Filters applied after merging. h) after merging a weighted mean seabed surface (grid) was created at a 5 m resolution. i) ran the statistical surface cleaning. Cleaning by 2 standard deviation 95%, polynomial 1: tilted plane, tile bugger 10%. j) created subset tiles of 500 square meters. Each tile was opened in subset editor to examine and clean soundings in both 2D and 3D. Tiles viewed in subset editor reveal when calibration is necessary or if there is a sound velocity error. k) if needed, a subset was examined with the calibration function to measure parameters like transducer mounting offsets (pitch, roll, heading). The calibration surveys were performed and allowed adjustments of the survey data parameters and modifications were written to the VCF. Survey modifications were as follows: 2000 survey - VCF for both days adjusted to yaw -9.0 and roll 0.35. 2001 survey - VCF for day 249 (9/6/01) adjusted roll to -0.25, for the day 251 adjusted roll to -0.35. 2003 survey: VCF for days 114, 115, and 119 adjusted to delta z +3.5m, for days 114 and 115 roll adjustment to -0.40. l) after adjusting the VCF files all associated lines for each survey were remerged and then regridded. m) grids were exported to x,y,z using the weighted grid to ASCII option selected units of geographic decimal degrees (DD). Five files were exported: PR_00_99_5m.xyz, PR_01_5m.xyz, PR_03_5m.xyz, PR_sw_03_5m.xyz, and PR_gapfill_5m.xyz.

    Person who carried out this activity:

    Kate T. Ciembronowicz
    U.S. Geological Survey
    Research Assistant
    600 4th Street South
    St. Petersburg, FL 33701-4846

    (727) 803-8747 x3124 (voice)
    (727) 803-2031 (FAX)
    kciembro@usgs.gov

    Data sources produced in this process:
    • PR_00_99_5m.xyz, PR_01_5m.xyz, PR_03_5m.xyz, PR_sw_03_5m.xyz, PR_gapfill_5m.xyz

    (process 2 of 8)
    Each of the x,y,z files were run trough Proj4.1 to convert the geographic coordinates to UTM, Zone 17, NAD83.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    (process 3 of 8)
    All the individual Pulley Ridge reprojected bathymetry files were combined into a single x,y,z file called allpr.xyz.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Data sources produced in this process:
    • allpr.xyz

    (process 4 of 8)
    This xyz file was brought into Surfer to create a 5x5 m grid with the bounds xmin: 218042.5, xmax: 237717.5, ymin: 231553.5, ymax: 2767328.5. The gridding parameters were block kriging, linear, slope = 1, aniso = 1,0, radius1=30, radius2=30. Output was sent to allpr_blockkrig.grd.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Data sources used in this process:
    • allpr.xyz

    Data sources produced in this process:

    • allpr_blockkrig.grd

    (process 5 of 8)
    This grid was then exported to a surfer ASCII grid format - filename out_allpr_asc.grd.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Data sources used in this process:
    • allpr_blockkrig.grd

    Data sources produced in this process:

    • out_allpr_asc.grd

    (process 6 of 8)
    This Surfer ASCII grid was converted to an ArcView ASCII grid using the ArcView 3.3 extension : Surfer extension 2.8 downloaded from the ESRI website. The output filename was out_allpr_asc.asc.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Data sources used in this process:
    • out_allpr_asc.grd

    Data sources produced in this process:

    • out_allpr_asc.asc

    (process 7 of 8)
    This ArcView ASCII grid was then imported to ArcView 3.3 and converted to and ESRI binary grid called allpr_unfil.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Data sources used in this process:
    • out_allpr_asc.asc

    Data sources produced in this process:

    • allpr_unfil

    (process 8 of 8)
    This grid was then cropped to a polygon which removed extraneous lines outside the majority of the data collection area. The resulting grid is all_unfilcrop.

    Person who carried out this activity:

    VeeAnn A. Cross
    U.S. Geological Survey
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700 x2251 (voice)
    (508) 457-2310 (FAX)
    vatnipp@usgs.gov

    Data sources used in this process:
    • allpr_unfil

    Data sources produced in this process:

    • all_unfilcrop

  3. What similar or related data should the user be aware of?

    He, R., and Weisbert, R.H., 2002, Tides on the West Florida Shelf: Journal Physical Oceanography v.32, p. 3455-3473.

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?

  3. How accurate are the heights or depths?

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

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

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:
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data. This information is not intended for navigational purposes.

  1. Who distributes the data set?[Distributor contact information not provided.]

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-May-2005
Metadata author:
VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

(508) 548-8700x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.6 on Fri May 13 13:05:24 2005