Bathymetry in Jobos Bay

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Frequently anticipated questions:


What does this data set describe?

Title: Bathymetry in Jobos Bay
Abstract:
This image represents a 4x4 meter resolution bathymetric surface for Jobos Bay, Puerto Rico (in NAD83 UTM 19 North). The depth values are in meters referenced to the NAD83 ellipsoidal heights.

NOAA's NOS/NCCOS/CCMA Biogeography Branch, in collaboration with NOAA's Chesapeake Bay Office and other territory and federal partners, acquired interferometric backscatter and bathymetry data in Puerto Rico from 04/07/2009 to 04/21/2009. Data were acquired with a pole-mounted Teledyne Benthos C3D-LPM interferometric SoNAR (200 kHz) and processed using CARIS HIPS and SIPS v7.0 software. The backscatter data were geometrically and radiometrically corrected using the Geocoder module in Hypack 2009. Acoustic backscatter mosaics are an important piece of information when characterizing surficial seafloor features and delineating benthic habitats.

Supplemental_Information:
Depth_System_Definition Depth_Datum_Name NAD83 Ellipsoidal Heights Depth_Resolution Unknown Depth_Distance_Units meters Depth_Encoding_Method Explicit depth coordinate included with horizontal coordinates
  1. How should this data set be cited?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch, 2010, Bathymetry in Jobos Bay: NOAA's National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -66.286311
    East_Bounding_Coordinate: -66.191788
    North_Bounding_Coordinate: 17.949058
    South_Bounding_Coordinate: 17.949058

  3. What does it look like?

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

    Beginning_Date: 07-Apr-2009
    Ending_Date: 21-Apr-2009
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: remote-sensing image

  6. How does the data set represent geographic features?

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

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 2451 x 1108 x 1, type Pixel

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -63.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 2.000000
      Ordinates (y-coordinates) are specified to the nearest 2.000000
      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 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?


Who produced the data set?

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

  2. Who also contributed to the data set?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch

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

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch
    Project Manager - Conservation Effects Assessment Project (CEAP): Jobos Bay, Puerto Rico Special Emphasis Watershed Partnership
    1305 East West Highway, N-SCI-1, SSMC 4, 9th Floor
    Silver Spring, MD 20910
    USA

    (301) 713-3028 (voice)
    (301) 713-4384 (FAX)

    Contact_Instructions:
    Contact info is for CCMA general reception. Please ask for current project manager of Conservation Effects Assessment Project (CEAP): Jobos Bay, Puerto Rico Special Emphasis Watershed Partnership


Why was the data set created?

This acoustic dataset was collected to support the characterization of seafloor features in, and creation of a benthic habitat map for, the Jobos Bay National Estuarine Research Reserve (NERR) in Puerto Rico. The benthic habitat map was created in order to support the management needs of the Jobos Bay NERR site, as well as to support the U.S. Department of Agriculture's Conservation Effects Assessment Project (CEAP) in Puerto Rico. The resulting publicly-distributed data is also a contribution to the greater scientific community interested in seafloor mapping in Puerto Rico.


How was the data set created?

  1. From what previous works were the data drawn?

    HSX Raw Data (source 1 of 4)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch, Unpublished material, HSX Raw Data.

    Type_of_Source_Media: external hard drive
    Source_Contribution: Original raw full resolution dataset.

    CARIS HDCS Processed Interferometric Data (source 2 of 4)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch, Unpublished material, CARIS HDCS Processed Interferometric Data.

    Type_of_Source_Media: external hard drive
    Source_Contribution:
    Processed, cleaned, and corrected full resolution dataset. Sourced from raw HSX data.

    BASE Surface (source 3 of 4)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch, Unpublished material, CARIS BASE Surface.

    Type_of_Source_Media: external hard drive
    Source_Contribution:
    Downsampled CARIS BASE (Bathymetry Associated with Statistical Error) grid with best depth layer. Sourced from processed HDCS data.

    Bathymetry_4x4m.tif (source 4 of 4)
    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch, 2010, GeoTIFF of 4x4 m Bathymetry for Jobos Bay, Puerto Rico, 2009, UTM 19N NAD83.

    Type_of_Source_Media: external hard drive
    Source_Contribution:
    Downsampled GeoTIFF raster containing depth values in meters (referenced to NAD83 ellipsoidal heights). Sourced from CARIS BASE surface.

  2. How were the data generated, processed, and modified?

    Date: 2009 (process 1 of 7)
    The Lead Hydrographer for this mapping project was independent contractor Jay Lazar from NOAA's Chesapeake Bay Office. Bathymetric and backscatter data were collected aboard the R/V Jurel from 4/7/2009 to 4/21/2009 using a pole-mounted Teledyne Benthos C3D-LPM interferometric (200 kHz) sonar. These datasets were logged in .HSX format using Hypack 2009. Line spacing for acquisition was typically three to five times the water depth, providing 100% bottom coverage. Heave, roll, pitch and heading correctors were collected using an Ixsea Octans gyrocompass and integrated motion sensor. Sound velocity profiles were acquired with a hand held CTD (conductivity, temperature and depth) profiler. Horizontal and vertical positions were obtained using a Trimble DSM 232 GPS receiver.

    Date: 2009 (process 2 of 7)
    GraphNav software was used to calculate vertical ellipsoidal heights and differentially correct horizontal positions using the CORS (Continually Operating Reference Station) in Coamo, Puerto Rico. This PPK (post processed kinetic) data was collected to tidally correct surveyed depths.

    Date: 2009 (process 3 of 7)
    Post mission, it was discovered that the sound velocity values in the raw HSX files needed to be replaced with the sound velocity value at the sonar head. The SV values in the HSX file needed to be replaced because the acquisition software packages (i.e., Hypack and C3D Benthos) did not transfer these values from the sonar head to the HSX datagrams correctly. An example of the incorrect SV value (i.e., 1500.00) in the HSX RMB header is show below:

    RMB 1 41815.565 2 4 1881 200 1500.00 18490

    The correct sound velocity values at the sonar head were located in the “look up” server log text file for each day. An example of a server log is shown below:

    Tue Apr 07 15:53:40 2009:Ping# 48889 S/ch 1902 Rng(m)49.9 Lty 592.017889 SpeedSound=1540.562256 Tue Apr 07 15:53:40 2009:Ping# 48890 S/ch 1902 Rng(m)49.9 Lty 650.454044 SpeedSound=1540.562256 Tue Apr 07 15:53:40 2009:Ping# 48891 S/ch 1902 Rng(m)49.9 Lty 599.314928 SpeedSound=1540.562256

    The SV values in the server log, however, were 1 m/s too slow (due to a calibration issue). Consequently, a value of 1 m/s was added to each SV value in the server log files before they were used to replace the SV values in the HSX files (using a custom script built by NOAA's Biogeography Branch). In all, SV values in 662 HSX lines were replaced using SV values from 12 separate server log files. These adjusted lines were then imported into CARIS v7.0.

    Date: 2009 (process 4 of 7)
    A geoid model was created for Jobos Bay in order to convert the surveyed depths from NAD83 ellipsoid heights and to Geoid03 heights. It is important to point out that GEOID03 heights are always above NAD83 ellipsoid heights. In order to convert from ellipsoid to geoid heights, the GEOID03 interpolation program (intg.exe) and binary grid file (g2003p01.bin) for Puerto Rico and the Virgin Islands (15 - 21 N & 291 - 296 E) were downloaded from NOAA's National Geodetic Survey (<http://www.ngs.noaa.gov/PC_PROD/GEOID03/>). In ArcGIS, a uniform 1x1 km point grid was created cover the entire surveyed area in Jobos Bay. Latitudes and longitudes were computed for each point in the 1x1 km grid. This point file was converted to a XYZ text file, and imported into the GEOID03 interpolation program. GEOID03 heights were calculated for each XY location, and added to the existing XYZ text file. This XYZ text file was imported into CARIS v7.0, and used as the model file to compute GPS tides. Dynamic heave and waterline offsets were also applied to the computed model. Once the model was computed for each line, the ellipsoidally referenced heights (from GraphNav) were reformatted to CARIS HIPS tide (.tid) files, and applied to the CARIS HDCS lines based on Julian day.

    Date: 2009 (process 5 of 7)
    Bathymetric data in HSX format were converted to HDCS format using CARIS HIPS v7.0 software. Zero tides and sound velocity corrections were applied to the converted lines. These corrections were then merged and used to calculated total propagated uncertainty (TPU). Zero tides were applied because the application of GPS tides created soundings above the water line and up to +/- 2m vertical stair-step-like artifacts between adjacent lines. Given that the application of GPS tides introduced more vertical error than they resolved, the depths for Jobos Bay were left being referenced to NAD83 ellipsoid heights (and not to Geoid03 heights).

    Date: 2009 (process 6 of 7)
    CARIS HIPS v7.0 software was used to generate a BASE surface (Bathymetry Associated with Statistical Error) from the processed HDCS data. The BASE surface was created using CUBE (Combined Uncertainty and Bathymetry Estimator) with the following parameters: (1) IHO S-44 Special Order specifications, (2) density & locale diambiguation method and (3) 0 - 100 m depth filter. The final BASE surface was created at a 4x4 m spatial resolution. Additional fliers were manually rejected in subset editor, in order to mitigate artifacts that were not removed by CUBE. Once the surface was satisfactorily cleaned, existing data holidays were filled using interpolation in CARIS (parameters = 1 iteration, matrix size of 5, 10 neighbors). The final, interpolated surface was exported to a comma delimited ASCII XYZ file using the "BASE Surface to ASCII" tool.

    Date: 2009 (process 7 of 7)
    Using a custom tool, the ASCII XYZ file was converted to a GeoTIFF in ArcMap. The custom tool was called "Convert XYZ to Raster" and is freely available for download from ESRI online support (www.support.esri.com).

  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?

    None.

  3. How accurate are the heights or depths?

    None.

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

    This GeoTIFF is sourced from a gridded dataset. The original full-resolution interferometric data was used to create a downsampled uniform-resolution surface from CARIS HIPS v7.0.

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

    All users should independently analyze the dataset according to their own needs and standards to determine data usability.


How can someone get a copy of the data set?

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

Access_Constraints: Please cite any use of this data.
Use_Constraints:
Note: NOT TO BE USED FOR NAVIGATION.

These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials.

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

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch
    Please ask for current project manager of Conservation Effects Assessment Project (CEAP): Jobos Bay, Puerto Rico Special Emphasis Watershed Partnership
    1305 East West Highway, N-SCI-1, SSMC 4, 9th Floor
    Silver Spring, MD 20910
    USA

    (301) 713-3028 (voice)
    (301) 713-4384 (FAX)

    Contact_Instructions:
    Contact info is for CCMA general reception. Please ask for current project manager of Conservation Effects Assessment Project (CEAP): Jobos Bay, Puerto Rico Special Emphasis Watershed Partnership
  2. What's the catalog number I need to order this data set?

    Offline Data

  3. What legal disclaimers am I supposed to read?

    These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 21-Oct-2013
Metadata author:
NOAA/NOS/NCCOS/CCMA Biogeography Branch
Attn: Project Manager - Conservation Effects Assessment Project (CEAP): Jobos Bay, Puerto Rico Special Emphasis Watershed Partnership
1305 East West Highway, N-SCI-1, SSMC 4, 9th Floor
Silver Spring, MD 20910
USA

(301) 713-3028 (voice)

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


Generated by mp version 2.9.13 on Tue Sep 23 10:43:15 2014