High-Resolution Bathymetry of Florida Bay

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Mark Hansen

Publication_Date: 2000

Title: High-Resolution Bathymetry of Florida Bay

Publication_Information:

Publication_Place: St. Petersburg, FL

Publisher: U.S. Geological Survey

Online_Linkage: <http://sofia.usgs.gov/projects/bathymetry/>

Description:

Abstract:

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.

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 had 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.

Supplemental_Information: This project was completed in 1999.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1889

Ending_Date: 1999

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

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: circulation model

Theme_Keyword: hydrology

Theme_Keyword: mapping

Theme_Keyword: SANDS

Theme_Keyword: sediment dynamics

Theme_Keyword: System for Accurate Nearshore Depth Surveying

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Florida Bay

Place_Keyword: Everglades National Park

Place_Keyword: Florida Keys

Place_Keyword: Florida

Place_Keyword: Miami-Dade County

Place_Keyword: Monroe County

Place_Keyword: Central Everglades

Place_Keyword: Blackwater Sound

Place_Keyword: Buchanan Key

Place_Keyword: Calusa Keys

Place_Keyword: Clive Key

Place_Keyword: Flamingo

Place_Keyword: Grassy Key

Place_Keyword: Joe Bay

Place_Keyword: Lake Ingraham East

Place_Keyword: Long Key

Place_Keyword: Lower Matecumbe Key

Place_Keyword: Madeira Key

Place_Keyword: Rock Harbor

Place_Keyword: Sandy Key

Place_Keyword: Schooner Key

Place_Keyword: Tavernier

Place_Keyword: Westlake

Place_Keyword: Upper Matecumbe Key

Place_Keyword: Pelican Keys

Place_Keyword: Plantation Key

Access_Constraints: none

Use_Constraints:

The U.S. Geological Survey must be referenced as the originator of the data from this project 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_Position: Oceanographer

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: <http://sofia.usgs.gov/publications/ofr/00-347/intro.html>

Browse_Graphic_File_Description: location of data collection area

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.

Cross_Reference:

Citation_Information:

Originator:

Hansen, Mark

DeWitt, Nancy T.

Publication_Date: 2000

Title: 1890 and 1990 Bathymetry of Florida Bay

Series_Information:

Series_Name: USGS Open-File Reports

Issue_Identification: OFR 00-347

Publication_Information:

Publication_Place: St. Petersburg, FL

Publisher: U.S. Geological Survey

Online_Linkage: <http://sofia.usgs.gov/publications/ofr/00-347/>

Data_Quality_Information:

Logical_Consistency_Report: not applicable

Completeness_Report: not available

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

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.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 0.05

Horizontal_Positional_Accuracy_Explanation:

GPS data was processed with Jet Propulsion Laboratory GIPS software.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

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.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.1

Vertical_Positional_Accuracy_Explanation:

GPS data was processed with Jet Propulsion Laboratory GIPS software.

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 U.S. 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.

Process_Date: 2000

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

Distribution_Information:

Distributor:

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

Resource_Description: 1890 and 1990 trackline data

Distribution_Liability: The data have no explicit or implied guarantees.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://sofia.usgs.gov/publications/ofr/00-347/>

Access_Instructions: Data is available from the SOFIA website in OFR 00-347

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20040415

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jo Anne Stapleton

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing address

Address: 521 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Voice_Telephone: 703 648-4592

Contact_Facsimile_Telephone: 703 648-4614

Contact_Electronic_Mail_Address: jastapleton@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

U.S. Department of the Interior, U.S. Geological Survey, Center for Coastal Geology
Comments and suggestions? Contact: Heather Henkel - Webmaster
Generated by mp version 2.7.33 on Thu Apr 15 15:15:04 2004