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Florida Bay 1890 trackline map

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Frequently-anticipated questions:

What does this data set describe?

Title: Florida Bay 1890 trackline map
The map shows the tracklines for historical bathymetric data for Florida Bay. The areas on the map are linked to the corresponding data sets which contain values for X (easting), Y (northing), Z (elevation), and the RMS set to 0.0.
  1. How should this data set be cited?

    Hansen, Mark, 2000, Florida Bay 1890 trackline map.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -81.11667
    East_Bounding_Coordinate: -80.36667
    North_Bounding_Coordinate: 25.25
    South_Bounding_Coordinate: 24.733333

  3. What does it look like?

    <https://sofia.usgs.gov/publications/ofr/00-347/1890trk.html> (GIF)
    location of 1890's tracklines

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

    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: map

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      Indirect_Spatial_Reference: Florida Bay

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      UTM_Zone_Number: 17
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -81
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000
      False_Northing: 0

      Planar coordinates are encoded using Coordinate Pair
      Abscissae (x-coordinates) are specified to the nearest 0.01
      Ordinates (y-coordinates) are specified to the nearest 0.01
      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.
      The flattening of the ellipsoid used is 1/298.257.

      Depth_Datum_Name: Mean low water
      Depth_Resolution: .01
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    The map shows the lines of data collection and each quad is linked to its corresponding data file.
    Entity_and_Attribute_Detail_Citation: USGS personnel

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

    • Mark Hansen

  2. Who also contributed to the data set?

    Nancy T. DeWitt assisted in the bathymetric surveys and data processing. L. Thornton processed the historical data and provided GIS support.

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

    Mark Hansen
    U.S. Geological Survey
    600 Fourth Street South
    St. Petersburg, FL 33701

    727 803-8747 x 3036 (voice)
    727 803-2030 (FAX)

Why was the data set created?

Detailed, high-resolution maps of Florida Bay mudbank elevations are needed to understand sediment dynamics and provide input into water quality and circulation models. The bathymetry of Florida Bay has not been systematically mapped in nearly 100 years, and some shallow areas of the bay have never been mapped.

Numerical circulation and sediment transport models being developed for the South Florida Ecosystem Restoration Program are being used to address water quality issues in Florida Bay. Digitizing the historical shoreline and bathymetric data for comparison with modern data provides information on sedimentation rates within the Bay.

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: Oct-1999 (process 1 of 1)
    The historical bathymetric data obtained form NOAA/NOS archives were digitized using an Altech Digitizer. The data was georeferenced from the digitizer coordinates to geographic coordinates (latitude and longitude) using archived NGS control points on NAD 83.

    Person who carried out this activity:

    Mark Hansen
    U.S. Geological Survey
    600 Fourth Street South
    St. Petersburg, FL 33701

    727 803-8747 x 3036 (voice)
    727 803-2030 (FAX)

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

    Hansen, Mark DeWitt, Nancy T., 2000, 1890 and 1990 Bathymetry of Florida Bay: USGS Open-File Report OFR 00-347, U.S. Geological Survey, St. Petersburg, FL.

    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?

    For data format consistencies, RMS values for the 1890's data set are equal to 0.0. The horizontal positions of each data point were transformed from Latitude/Longitude to UTM (Zone 17) XY coordinates using NOAA/NGS software UTMSv1.0.

  3. How accurate are the heights or depths?

    For data format consistencies, RMS values for the 1890's data set are equal to 0.0. Vertical positions were referenced to MLW (Mean Low Water).

    According to NOAA tidal datum information, NAVD88 is approximately 0.41m (1.35 ft) above MLW in the Florida Bay area. The 1.35 feet average is calculated using the elevation information from several tidal benchmarks throughout the Florida Keys. These tidal benchmarks are published by the National Geodetic Survey and can be located on their website <http://www.ngs.noaa.gov/cgi-bin/ngs_opsd.prl/>. Five tidal benchmarks were chosen from four different U.S. Geological Quadrangle locations including Blackwater Sound, Plantation Key, Long Key and Grassy Key.

    To compare the 1890's values to NAVD88 add 1.35 ft. to the depth values.

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

    No data were collected for the Lake Ingraham and Madeira Key quads in 1890.

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

    not applicable

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: none
The U.S. Geological Survey must be referenced as the originator of the data set in any future products or research derived from these data.

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

    Heather S.Henkel
    U.S. Geological Survey
    600 Fourth St. South
    St. Petersburg, FL 33701

    727 803-8747 ext 3028 (voice)
    727 803-2030 (FAX)

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

    Florida Bay 1890's trackline map

  3. What legal disclaimers am I supposed to read?

    The data have no implied or explicit guarantees

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 11-Jun-2007
Metadata author:
Heather Henkel
U.S. Geological Survey
600 Fourth Street South
St. Petersburg, FL 33701

727 803-8747 ext 3028 (voice)
727 803-2030 (FAX)

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://sofia.usgs.gov/metadata/sflwww/hansen_1890_trackline_map.faq.html>

U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather Henkel - Webmaster
Generated by mp version 2.8.18 on Mon Jun 11 15:44:22 2007