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Florida Bay 1990 trackline map

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Mark Hansen
Publication_Date: 2000
Title: Florida Bay 1990 trackline map
Edition: version 1
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey, Center for Coastal Studies
Online_Linkage: <https://sofia.usgs.gov/projects/bathymetry/>
Description:
Abstract:
The map shows the tracklines for bathymetric data collected between 1995 and 1999 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 computed from Ashtech PNAV software.

The data set is labeled 1990 for easy comparison. The project duration was a decade.

Purpose:
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. An accurate, modern bathymetric survey provides a baseline for assessing future sedimentation rates in the Bay, and a foundation for developing a sediment budget. Due to the complexity of the Bay and age of existing data, a current bathymetric grid (digitally derived from the survey) is critical for numerical models.

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. Application of these models is complicated due to the complex seafloor topography (basin/mudbank morphology) of the Bay. The only complete topography data set of the Bay is 100 years old. Consequently, an accurate, modern seafloor bathymetry map of the Bay is critical for numerical modeling research. A modern bathymetry data set will also permit a comparison to historical data in order to help access sedimentation rates within the Bay.

The objective of this research was to collect new bathymetry for all of Florida Bay, digitize the historical shoreline and bathymetric data, compare previous data to modern data, and produce maps and digital grids of historical and modern bathymetry.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1995
Ending_Date: 1999
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81.11667
East_Bounding_Coordinate: -80.36667
North_Bounding_Coordinate: 25.25
South_Bounding_Coordinate: 24.733333
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: bathymetry
Theme_Keyword: hydrology
Theme_Keyword: mapping
Theme_Keyword: SANDS
Theme_Keyword: sediment dynamics
Theme_Keyword: System for Accurate Nearshore Depth Surveying
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: inlandWaters
Theme_Keyword: oceans
Theme_Keyword: 007
Theme_Keyword: 010
Theme_Keyword: 012
Theme_Keyword: 014
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, DC, National Institute of Standards and Technology
Place_Keyword: United States
Place_Keyword: US
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, DC, NIST
Place_Keyword: Florida
Place_Keyword: FL
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology
Place_Keyword: Miami-Dade County
Place_Keyword: Monroe County
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: Blackwater Sound
Place_Keyword: Buchanan Keys
Place_Keyword: Calusa Keys
Place_Keyword: Clive Key
Place_Keyword: Flamingo
Place_Keyword: Everglades National Park
Place_Keyword: Grassy Key
Place_Keyword: Joe Bay
Place_Keyword: Long Key
Place_Keyword: Lower Matecumbe Key
Place_Keyword: Pelican Keys
Place_Keyword: Plantation Key
Place_Keyword: Rock Harbor
Place_Keyword: Sandy Key
Place_Keyword: Tavernier
Place_Keyword: Upper Matecumbe Key
Place_Keyword: West Lake
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Central Everglades
Place_Keyword: Madeira Key
Place_Keyword: Schooner Key
Place_Keyword: Lake Ingraham East
Place_Keyword: Florida Keys
Access_Constraints: none
Use_Constraints:
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.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mark Hansen
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 x 3036
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: mhansen@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: <https://sofia.usgs.gov/publications/ofr/00-347/1990tk.html>
Browse_Graphic_File_Description: location of 1990's tracklines
Browse_Graphic_File_Type: GIF
Data_Set_Credit:
Nancy T. DeWitt assisted in the bathymetric surveys and data processing. L. Thornton processed the historical data and provided GIS support.
Native_Data_Set_Environment: The data are in ASCII text files
Cross_Reference:
Citation_Information:
Originator:
Hansen, Mark

DeWitt, Nancy T.

Publication_Date: 2000
Title: 1890 and 1990 Bathymetry of Florida Bay
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Open-File Report
Issue_Identification: OFR 00-347
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey
Online_Linkage: <https://sofia.usgs.gov/publications/ofr/00-347/>

Data_Quality_Information:
Logical_Consistency_Report: not applicable
Completeness_Report:
All data were processed and used to generate the bathymetric data points.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 0.05
Horizontal_Positional_Accuracy_Explanation: unavailable
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Vertical positions were converted from ellipsoid height to orthometric height using NOAA/NGS software GEOID96, where orthometric height is considered to be equal to NAVD88.

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. The open-file report contains a table for quick reference of information for the five tidal benchmarks.

To compare this data set with other depth information which is relative to MLW, e.g. NOAA nautical charts, 0.41 m (1.35 ft) is algebraically subtracted from each depth value or contour line.

Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.01
Vertical_Positional_Accuracy_Explanation: not available
Lineage:
Process_Step:
Process_Description:
Florida Bay was mapped by using a shallow-draft boat equipped with a high-precision Global Positioning System (GPS) coupled with a high-precision depth sounder. To accomplish this task, SANDS (System for Accurate Nearshore Depth Surveying) was developed by Mark Hansen and Jeff List of the US Geological Survey. SANDS utilizes differential GPS receivers, a digital fathometer, a heave-roll-pitch sensor, and a shallow-draft boat. The SANDS system is accurate to approximately 4 cm horizontally and 8 cm vertically and collects data in water depths as shallow as 30 cm. To achieve this accuracy, the boat's roving distance from any one GPS reference receiver location must be within a 10-kilometer radius.

Data was collected on a USGS 7.5-minute quadrangle-by-quadrangle basis, proceeding westward from Blackwater Sound. The trackline spacing varied depending upon the relief of the sea floor; that is, closer spacing adjacent to mudbanks and wider spacing in the basins. Tracklines were surveyed in a north-south orientation, and crossings (intersecting tracklines) were surveyed in an east-west orientation. Crossing lines are critical because they served as a check on the accuracy of the system. In theory, data values at the crossing should be exactly the same. In reality, this is not always the case due to random errors of each sensor. Eighty-five percent of the crossings in this data set were within +/- 6 cm with the balance within +/- 20 cm.

Ideally, crossings are made at the end of the survey day; however, some of the crossings were made months and even years after an area was initially surveyed. The results are very good considering the soft bottom characteristics of Florida Bay. Bathymetric positions for this study were derived using differential GPS techniques on 10-km baselines or less. One or more GPS reference stations (base stations) were continuously recording full-phase carrier data while the boat surveyed. A rover GPS receiver on the boat was simultaneously recording carrier information.

Record epoch interval was 1 second for both base station and rover receivers. Precise positions for each epoch were computed using Ashtech Precise Differential GPS Navigation and Surveying (PNAV) v2.0 software. PNAV provides a root mean squared (RMS) value for each epoch. For this study, a RMS value of 0.08 cm or less was considered reasonable. An RMS value of 1.0 indicates that the GPS data ambiguities were unresolved, and that the depths were determined by a tie-line best-fit method. 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. Vertical positions were converted from ellipsoid height to orthometric height using NOAA/NGS software GEOID96, where orthometric height is considered to be equal to NAVD88. 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 this data set with other depth information, which is relative to MLW, e.g. NOAA nautical charts, 0.41 m (1.35 ft) is algebraically subtracted from each depth value or contour line.

Geodetic control in Florida Bay was lacking in number and geometric strength. In order to accomplish centimeter vertical accuracy, additional geodetic control needed to be established within the Bay. Thirteen new temporary ground-control points or benchmarks (surveyed to within 1 cm to 2 cm accuracy) were established throughout the Bay for use as reference receiver sites. The thirteen benchmarks were surveyed using Ashtech Z-12, 12 channel dual-frequency GPS receivers. Full-phase carrier data were recorded on each occupied benchmark in Ashtech proprietary BIN format with daily occupations ranging from 6 to 12 hours. BIN files were then converted to RINEX-2 format and position determined by the National Aeronautics and Space Administrations (NASA) Jet Propulsion Laboratory GIPSY system software. The GIPSY derived positions were provided in ITRF96 coordinate system for each (daily) occupation. Using National Oceanic and Atmospheric Administration/National Geodetic Survey (NOAA/NGS) software HTDPv2.3, ITRF96 positions were transformed to NAD83/GRS80 positions. The computed daily positions were then averaged to derive a final benchmark location and elevation. Daily outliers greater than 0.05cm (in the vertical component) from the average were not included in the final average.

Process_Date: 199910
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Nancy DeWitt
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext. 3058
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: ndewitt@usgs.gov

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Florida Bay

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 17
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -81
Latitude_of_Projection_Origin: 0
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution: 0.01
Ordinate_Resolution: 0.01
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
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

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather S.Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 600 Fourth St. South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: hhenkel@usgs.gov
Resource_Description: Florida Bay 1990's trackline map
Distribution_Liability: The data have no implied or explicit guarantees
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GIF
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <https://sofia.usgs.gov/publications/ofr/00-347/1990tk.html>
Access_Instructions: Data may be downloaded from the SOFIA website
Fees: None

Metadata_Reference_Information:
Metadata_Date: 20070611
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: sofia-metadata@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://sofia.usgs.gov/metadata/sflwww/hansen_1990_trackline_map.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 15:42:37 2007