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Hydrological Data

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Frequently-anticipated questions:

What does this data set describe?

Title: Hydrological Data
Hydrological data was collected at 11 sites for the Caloosahatchee Estuary and Estero Bay regions.using two methods, one developed by the USGS and the other developed by the National Aeronautics and Space Administration. Data collected include date and time of collection, stage, discharge, salinity, and water temperature.
  1. How should this data set be cited?

    Hansen, Mark, 2005, Hydrological Data.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -81.59
    East_Bounding_Coordinate: -81.38
    North_Bounding_Coordinate: 25.96
    South_Bounding_Coordinate: 25.89

  3. What does it look like?

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

    Beginning_Date: 21-Oct-2004
    Ending_Date: 06-Jun-2005
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: maps and data

  6. How does the data set represent geographic features?

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

      Indirect_Spatial_Reference: southwest coast of Florida
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (11)

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 1. Longitudes are given to the nearest 1. Latitude and longitude values are specified in Degrees, minutes, and decimal seconds.

      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.

  7. How does the data set describe geographic features?

    Hydrological data collected for each site includes stage, discharge, salinity, and temperature
    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?

  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?

This project addresses the collection and interpretation of data necessary to develop the present day bathymetry of the lower portions of South Florida including: Estero Bay, Charlotte Harbor, Pine Island Sound, offshore regions of Sanibel and Captiva Islands and the Caloosahatchee, Loxahatchee, and St. Lucie Rivers. In addition, a need for an Estero Bay and Charlotte Harbor estuarine mixing model has been identified by the Southwest Florida Regional Restoration Coordination Team and the Southwest Florida Feasibility Study. In order to create an accurate numerical model, current bathymetric data must be obtained. Bathymetry data is also needed for the creation of a seagrass vision maps (an NEP effort) and to populate the species response models being created as assessment tools for several restoration programs.

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: 2006 (process 1 of 2)
    The plan to acquire bathymetric data for the area is to employ two methods which have been developed by the U. S. Geological Survey (USGS) and National Aeronautical and Space Administration (NASA). The USGS method is an acoustic based system named System for Accurate Nearshore Depth Surveys (SANDS), and the NASA method is an airborne LIDAR system named Experimental Advanced Airborne Research Lidar (EAARL).

    The USGS has developed a hydrographic survey system specifically designed to map in very shallow water. The system can acquire data in water depths of ~25cm, but in practice boat/motor draft limitations prevent surveying in water depths less than 45cm. Precise differential GPS receivers are used to measure boat position and dynamic elevation, a survey quality 200 kHz depth sounder acquires water depth measurements, and a motion sensor measures heave, pitch, and roll of the boat. A measurement is collected about every 3m along a survey line. The vertical accuracy of the system is +/- 8cm and +/- 4cm inches horizontally.

    EAARL is a new airborne lidar that provides unprecedented capabilities to bays, the nearshore shoreface, benthic habitats, coastal vegetation, and sandy beaches. The EAARL sensor suite includes a rasterscanning- water penetrating full-waveform adaptive lidar, a down-looking color digital camera, a hyperspectral scanner, and an array of precision kinematic GPS receivers which provide for sub-meter georeferencing of each laser and hyper-spectral sample. EAARL has the unique real-time capability to detect, capture, and automatically adapt to each laser return backscatter over a large signal dynamic range and keyed to considerable variations in vertical complexity of the surface target. EAARL limited to water depths greater than 50 cm and can penetrate the water column to approximately 1.5 secchi disk depth. The lidar has a ground footprint of 30cm with vertical and horizontal accuracies equal to the SANDS system. The swath width is 250m which converts to a spatial coverage of approximately 1 laser shot per square meter.

    The EAARL system wasa used to map shallow (less than 1.5 secchi depth) and nonturbid areas in Estero Bay and nearshore areas. The SANDS system was used in deeper areas and those which are turbid which include the Caloosahatchee River.

    Bathymetric mapping has been done for the following areas: Estero Bay, Charlotte Harbor, Pine Island Sound, offshore regions of Sanibel and Captiva Islands and on the Florida West Coast the Caloosahatchee, Shark, Little Shark, Broad, Harney, Lopez, Chatham, and Turner Rivers. The offshore region between Ft. Myers and Naples, FL will be mapped during FY05.

    Date: 2006 (process 2 of 2)
    Hydrologic information was collected at the main tributary rivers flowing into the Ten Thousand Islands Aquatic Preserve, including (1) Barron River, (2) Ferguson River/Tide Creek, (3) East River, (4) Fakahatchee River, (5) Faka Union River, (6) Wood River, (7) Little Wood River, (8) Pumpkin River, (9) Whitney River, (10) Blackwater River, and (11) Palm Bay River. The information collected includes time-series data for water level, velocity, salinity, and temperature, for a period not to exceed 3-months. Acoustic Doppler Velocity Meters (ADVM) equipped with an up-looking transducer were installed to facilitate the collection of water stage and velocity with one single instrument. ADCP discharge measurements were made for the development of Index-Velocity calibration ratings at all instrumented sites. ADCP measurement sessions thru tide were made to capture the tidal characteristics of these rivers, and used for rating development. Discharge was computed for the 3-month period for all stations, and analyzed to describe tidal magnitudes that include possible variations due to meteorological events, such as rain and wind. Priorities for bathymetric and hydrologic information needs were set by the comparison of these tidal magnitudes at all measured rivers. In turn, hydrodynamic modelers can use these data to calibrate and verify models describing flow patterns throughout the study area. The study area encompasses the estuarine regions from Everglades City to Goodland.

    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?

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?

    GPS was used to establish the location of the sampling sites.

  3. How accurate are the heights or depths?

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

    The data were collected at 15 minute intervals at each site over 3 to 6 month periods

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

    Palm River's Index velocity meter came out of the water during low tide. The record for this period was deleted. There was a large volume of data deleted due to the sensor coming out of the water often. We decided to try and estimate the discharge record by using the index velocity meter at Blackwater River. Therefore, the entire period of record of discharge for Palm River is estimated.

    All other values are direct measurements

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: none

  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?

    Hydrological Data

  3. What legal disclaimers am I supposed to read?

    The data have no explicit or implied guarantees.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 06-Jun-2011
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_10000_islands.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 06 14:26:45 2011