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: 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: circulation model 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: inlandWaters Theme_Keyword: 007 Theme_Keyword: 012 Theme_Keyword: imageryBaseMapsEarthCover Theme_Keyword: 010 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, D.C., 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, D. C., 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: Monroe County Place_Keyword: Miami-Dade County Place: Place_Keyword_Thesaurus: USGS Geographic Names Information System Place_Keyword: Blackwater Sound Place_Keyword: Buchanan Keys Place_Keyword: Calusa Keys Place_Keyword: Grassy Key Place_Keyword: Clive Key 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_Keyword: Flamingo Place_Keyword: Florida Bay Place_Keyword: Joe Bay Place_Keyword: Lake Ingraham East Place_Keyword: Everglades National Park Place: Place_Keyword_Thesaurus: none Place_Keyword: Central Everglades Place_Keyword: Florida Keys Place_Keyword: Madeira Key Place_Keyword: Schooner 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 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: 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: Mark E. Hansen Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 600 Fourth St. South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: 727-803-8747 ext.3036 Contact_Facsimile_Telephone: 727-803-2032 Contact_Electronic_Mail_Address: mhansen@usgs.gov Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Florida Bay Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Mark E. Hansen Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 600 Fourth St. South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: 727-803-8747 ext.3036 Contact_Facsimile_Telephone: 727-803-2032 Contact_Electronic_Mail_Address: mhansen@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: 20061016 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