Ground Validation Drop Camera Transect Points - St. Thomas/ St. John USVI - 2011

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Frequently anticipated questions:


What does this data set describe?

Title:
Ground Validation Drop Camera Transect Points - St. Thomas/ St. John USVI - 2011
Abstract:
This shapefile denotes the location of underwater video that was collected by NOAA scientists using a SeaViewer drop camera system. Video were collected between 03/28/2011 and 04/16/2011 at locations within two selected areas of seafloor south of St. Thomas and St. John, USVI and east of Vieques, Puerto Rico. These videos will be manually classified into different habitat classes, and integrated with the abiotic data collected by the acoustic SoNAR (sound navigation and ranging) systems to develop a benthic habitat map for the U.S. Caribbean. Habitat maps describe the location of habitat features (in relation to the shoreline), their physical composition and the types of organisms that colonize them. Fundamentally, habitat maps provide critical information about the extent, health and composition of marine resources, which is vital for communicating information about the distribution and abundance of species to resource managers, scientists and the public. Habitat maps also support an increasing number of landscape ecology studies, as well as the process of marine spatial planning, including the design and evaluation of marine protected areas (MPAs).
  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, 2011, Ground Validation Drop Camera Transect Points - St. Thomas/ St. John USVI - 2011: NOAA's Ocean Service, National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.

    Online Links:

    Other_Citation_Details: Seafloor Characterization of the U.S. Caribbean

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -65.195981
    East_Bounding_Coordinate: -64.657582
    North_Bounding_Coordinate: 18.285562
    South_Bounding_Coordinate: 18.169814

  3. What does it look like?

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

    Beginning_Date: 28-Mar-2011
    Ending_Date: 16-Apr-2011
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

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

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity Point (4852)

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 20
      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 Coordinate Pair
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      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?

    DropCamera_2011_Transects_Points
    Shapefile attribute table (Source: None)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: Biogeography Branch)

    Coordinates defining the features.

    Assessment
    Type of equipment used (Source: Biogeography Branch)

    Description of equipment used for sampling.

    Site_ID
    Unique site ID (Source: Biogeography Branch)

    Another alphanumeric value assigned to each dive.

    Date_
    The date on which the underwater photos/video were collected. (Source: NOAA)

    Range of values
    Minimum:3/28/2011
    Maximum:4/16/2011

    Time_
    The local time (EST) at which the underwater photos/video were collected. (Source: NOAA)

    Range of values
    Minimum:7:23:40 AM
    Maximum:2:29:48 PM

    CamLat
    The latitude of the camera. (Source: NOAA)

    Degrees decimal minutes.

    CamLong
    The longitude of the camera. (Source: NOAA)

    Degrees decimal minutes.

    CamEast
    The easting of the camera. (Source: NOAA)

    Easting in meters.

    CamNorth
    The northing of the camera. (Source: NOAA)

    Northing in meters.


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?

  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 - Seafloor Characterization of US Caribbean
    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 Biogeography project manager for Seafloor Characterization of US Caribbean.


Why was the data set created?

The objective of this ground validation (GV) effort, conducted by NOAA's Center for Coastal Monitoring and Assessment Biogeography Branch, in collaboration with multiple federal, state, territory, academic and private sector partners, was to acquire spatially-explicit information about the geomorphological structure, biological cover and live coral cover of the seafloor in the U.S. Caribbean. Extensive field work is needed to create high-quality benthic habitat maps because it enhances the accuracy of habitat attribution and (to a lesser degree) habitat delineation. Consequently, ground validation locations were targeted by the cartographer to satisfy the following objectives: (1) Explore features in the imagery with unknown or confusing acoustic signatures; (2) Confirm that the habitat type correlated with a particular acoustic signature remained consistent throughout the entire study area. This information will be incorporated into a fine-scale assessment of the status, abundance, and distribution of marine habitats in the U.S. Caribbean.


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: 2011 (process 1 of 3)
    As the multibeam survey was carried out, a NOAA contractor would examine the bathymetry, produced as a CARIS BASE Surface, and placed discrete points on features on the surface that had unknown acoustic signatures. Points were also placed on features with known acoustic signatures (evenly distributed throughout the geographic extent of the map) to confirm that the habitats associated with these signatures remained consistent through the area of interest. These two types of points were labeled as "ground validation" sites and were visited in the field.

    Person who carried out this activity:

    NOAA/NOS/NCCOS/CCMA Biogeography Branch
    Project Manager - Seafloor Characterization of the U.S. Caribbean
    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 Seafloor Characterization of the U.S. Caribbean.
    Date: 2011 (process 2 of 3)
    NOAA scientists explored these ground validation locations using a manually operated drop camera. The resulting GPS and video information was processed and analyzed in preparation for use in habitat delineation and classification. At the start of every morning, the chief scientist selected a general region to begin the day's ground validation work aboard a small launch. Navigating to field locations was accomplished using a Garmin GPS 76 device with the uploaded GV site coordinates. The boat captain maneuvered the vessel to within 5 m of the target location and made every effort to maintain that location without jeopardizing crew and equipment safety. Once on site, NOAA scientists would simultaneously deploy a SeaViewer Sea-Drop 950 camera and begin logging a waypoint on a Trimble GeoXT GPS receiver. While the video camera was capturing bottom imagery, an observer viewed the video real-time on a SeaViewer DVR viewer aboard the survey vessel. They categorized each site according to the levels of the habitat classification scheme: major and detailed geomorphological structure, major biological cover, percent major biological cover and percent coral cover. Data was entered into a custom data dictionary generated in Trimble Pathfinder Office software and loaded onto the Trimble data logger.

    Person who carried out this activity:

    NOAA/NOS/NCCOS/CCMA Biogeography Branch
    Project Manager - Seafloor Characterization of the U.S. Caribbean
    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 Seafloor Characterization of the U.S. Caribbean.
    Date: 2011 (process 3 of 3)
    Trimble Pathfinder Office software was used to post process and differentially correct the raw GPS data to the Continually Operating Reference System (CORS) station at St. Thomas, USVI (VITH).

    Person who carried out this activity:

    NOAA/NOS/NCCOS/CCMA Biogeography Branch
    Project Manager - Seafloor Characterization of the U.S. Caribbean
    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 Seafloor Characterization of the U.S. Caribbean.
  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?

    The points in this data layer were acquired by GPS data using a Trimble GeoXT receiver. All data point characteristics were recorded in the GPS data logger automatically and seamlessly transferred to ArcGIS shapefiles using Trimble Pathfinder Office software. Attributes are all expected to be correct.

  2. How accurate are the geographic locations?

    It is estimated that horizontal accuracies may be 0 - 20m from the true position of the underwater camera assessment due to line "lay-back" during drift.

  3. How accurate are the heights or depths?

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

    104 field positions were occupied and habitat characterizations were conducted for ground validation during this work.

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

    Data points were collected with mapping-grade GPS receivers. The data were post processed for differential correction to the Continually Operating Reference System (CORS) station at St. Thomas, USVI (VITH). All attribute information was recorded by the GPS receiver and stored directly in the raw GPS files. This automated process was assumed to be error free. This file is believed to be logically consistent.


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
    Project Manager - Seafloor Characterization of US Caribbean
    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 Biogeography project manager for Seafloor Characterization of US Caribbean.
  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    The National Oceanic and Atmospheric Administration (NOAA) National Centers for Coastal Ocean Science (NCCOS) Biogeography Branch does not guarantee the accuracy of the geographic features or attributes. Please see the written report and metadata records for each data set for complete information on the source, limitations, and proper use.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    Contact NOAA for distribution options (see Distributor).


Who wrote the metadata?

Dates:
Last modified: 28-Dec-2012
Last Reviewed: 18-Sep-2014
Metadata author:
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch
Attn: REQUIRED: The person responsible for the metadata information.
Project Manager - Seafloor Characterization of US Caribbean
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 Biogeography project manager for Seafloor Characterization of US Caribbean
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.13 on Thu Nov 27 10:43:39 2014