2022-334-FA_BocaChica_Polecam_Imagery: High-resolution Geophysical and Imagery Data Collected in November 2022 Offshore of Boca Chica Key, FL

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Frequently anticipated questions:

What does this data set describe?

Title:
2022-334-FA_BocaChica_Polecam_Imagery: High-resolution Geophysical and Imagery Data Collected in November 2022 Offshore of Boca Chica Key, FL
Abstract:
Underwater images totaling 23,948 in number were collected offshore of Boca Chica Key, the Florida Keys , during November 2022, using the Polecam system developed by the U.S. Geological Survey (USGS). The Polecam system is a single downward-looking underwater Teledyne FLIR camera with a Computar V1228-MPY lens and with a rigidly-attached Global Navigation Satellite System (GNSS) antenna mounted directly above the camera's central axis. The pole camera was attached to the gunwale of the USGS research vessel (R/V) Sallenger. The Polecam system captured images as Tag Image File Format (TIFF, .tif) files to maintain the highest resolution and bit depth. In this data release, the files were converted into Joint Photographic Experts Group (JPEG, .jpg) file to enhance the accessibility of the imagery. Each image contains imagery header metadata embedded within the file, including GNSS date, time, latitude and longitude of the GNSS antenna, copyright, keywords, and other descriptive information. Refer to the ‘IMAGERY HEADERS’ Process Step of the metadata for more information on the imagery headers.
Supplemental_Information:
Additional survey and data details are available from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-334-FA. The complete imagery dataset can be accessed on the Imagery Data System (IDS), https://cmgds.marine.usgs.gov/idsviewer/data_release/10.5066-P9KNCMFY.
  1. How might this data set be cited?
    Stalk, Chelsea A., Wei, Emily A., Farmer, Andrew S., Hatcher, Gerry A., and Kranenburg, Christine J., 20231116, 2022-334-FA_BocaChica_Polecam_Imagery: High-resolution Geophysical and Imagery Data Collected in November 2022 Offshore of Boca Chica Key, FL:.

    This is part of the following larger work.

    Stalk, Chelsea A., Wei, Emily A., Farmer, Andrew S., Hatcher, Gerry A., and Kranenburg, Christine J., 20231116, High-resolution Geophysical and Imagery Data Collected in November 2022 Offshore of Boca Chica Key, FL: U.S. Geological Survey data release doi:10.5066/P9KNCMFY, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -81.700655
    East_Bounding_Coordinate: -81.681257
    North_Bounding_Coordinate: 24.556835
    South_Bounding_Coordinate: 24.549621
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 12-Nov-2022
    Ending_Date: 13-Nov-2022
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  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 3000 x 4096, type Pixel
    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 0.0000000000001. Longitudes are given to the nearest 0.0000000000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum of 1983 (2011).
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Datum 1983 (2011)
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The 2022_334-FA_polecam_images dataset is the complete set of images (23,948 JPEG images) captured using the USGS Polecam aboard the R/V Sallenger from November 12-13, 2022. These images are available for view and download on the IDS, https://cmgds.marine.usgs.gov/idsviewer/data_release/10.5066-P9KNCMFY. Users are advised to read the imagery headers for more information about the dataset.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information were generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Chelsea A. Stalk
    • Emily A. Wei
    • Andrew S. Farmer
    • Gerry A. Hatcher
    • Christine J. Kranenburg
  2. Who also contributed to the data set?
    Data collection was funded by the Defense Advanced Research Protection Agency (DARPA) Reefense Program. The authors would like to thank Edward Barham at Naval Air Station Key West for his help coordinating survey logistics, and Joanne Delaney at the Office of National Marine Sanctuaries, National Oceanic and Atmospheric Administration (NOAA) Florida Keys National Marine Sanctuary (FKNMS), for coordination efforts. This data release was improved thanks to helpful reviews from Erin Lyons.
  3. To whom should users address questions about the data?
    Chelsea A. Stalk
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Electronics Technician (Marine Instrumentation)
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov

Why was the data set created?

The underwater images and associated location data were collected to perform a site survey for potential artificial coral reef placement offshore of Naval Air Station Key West. Data were collected during USGS Field Activity Number (FAN) 2022-334-FA. Chirp Subbottom Profile data were also collected during this same survey (2022-334-FA). Please refer to Forde and others (2023) for more information.

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: 12-Nov-2022 (process 1 of 5)
    IMAGE ACQUISITION: Images were collected as .tif files by the USGS Polecam system, which was mounted to the USGS vessel R/V Sallenger and transited at a speed of approximately 3 knots during USGS field activity 2022-334-FA. Imagery was acquired from November 12-13, 2022, using the Marfac Machine Vision Camera Interface Software, which was developed by USGS scientists (Hatcher, 2021). The image-collection frequency was 1 Hz, and GNSS positions were recorded at 10 Hz. Aperture and shutter speed were consistent for each group of images at a study site. Image files were named programmatically during collection with the USGS field activity number, 2022-334-FA, location of field work, a 14-digit UTC date-time value formatted as yyyymmddhhmmss, thousandths of seconds, and the sequential image number for that camera. For example, '2022-334-FA_BocaChica-20221112173133_400-1.tif' indicates field activity 2022-334-FA, the study site at Boca Chica, November 12, 2022, 17:31:33.400 (UTC), and camera image 1 of the series. Person who carried out this activity:
    Chelsea A. Stalk
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Electronics Technician (Marine Instrumentation)
    600 4th Street South
    St. Petersburg, FL
    USA

    (727)502-8000 (voice)
    cstalk@usgs.gov
    Data sources produced in this process:
    • raw images
    Date: 14-Dec-2022 (process 2 of 5)
    POLECAM NAVIGATION PROCESSING: Raw GNSS data received by a Spectra SP90 Receiver and Trimble Zephyr GNSS Antenna mounted on top of the Polecam were recorded at 10 Hz. The GNSS data were post-processed and differentially corrected against the Key West, Florida, (FLKW) continuously operating reference station (CORS) in NovAtel's GrafNav software. Horizontal coordinates were referenced to the North American Datum of 1983 (National Spatial Reference System 2011) coordinate system. The positions in the Polecam navigation file represent the post-processed position of the GNSS antenna reference point (ARP), which was located vertically above the camera. Neither elevation nor bathymetric data were collected using the GNSS antenna. The following offset values for the camera were calculated for x,y,z in units of meters. 0 m(x), 0 m(y), and 1.84 m(z). The approximate 1.84-m vertical offset between the antenna and the Polecam instrument were not accounted for during acquisition, nor have the post-processed navigation files been corrected to reflect the offset. Person who carried out this activity:
    Chelsea A. Stalk
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Electronics Technician (Marine Instrumentation)
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    cstalk@usgs.gov
    Date: 25-Jul-2023 (process 3 of 5)
    Conversion of Images to .JPEG The images acquired with the camera were converted from TIF format to JPEG format using ImageMagick using the following command: 'magick mogrify -format .jpg *.tif'. Person who carried out this activity:
    Emily A. Wei
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Research Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    ewei@usgs.gov
    Date: 25-Jul-2023 (process 4 of 5)
    IMAGERY HEADERS: The images acquired with the camera were geotagged and processed to add additional information required by the USGS to the exchangeable image file format (EXIF) and other imagery headers using Phil Harvey's ExifTool. The images were given EXIF header information in the directory with all the photos by assigning all the tags in a text file to each photo using ExifTool. Adding headers also required a .csv file containing tags of the image name, GPSDateTime, GPSLatitude, and GPSLongitude. The following describes the dictionary object in the text file with each entry in the dictionary being a tag-value pair: tags = {'Copyright': 'Public Domain', 'CopyrightNotice': 'Public Domain - please credit U.S. Geological Survey', 'Artist': 'USGS SPCMSC', 'Make': 'TELEDYNE FLIR', 'Model': 'BFS-PGE-122S6C-C', 'GPSMapDatum': 'EPSG:6318 NAD83 (2011) ', 'GPSLatitudeRef': 'N', 'GPSLongitudeRef': 'W', 'Credit': 'U.S. Geological Survey', 'Contact': 'gs-g-spcmsc_data_inquiries@usgs.gov', 'UsageTerms': "Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty", 'AttributionURL': 'https://doi.org/10.5066/P9KNCMFY', 'XMP-photoshop:Credit': 'U.S. Geological Survey', 'iptcCore:CreatorWorkEmail': 'gs-g-spcmsc_data_inquiries@usgs.gov', 'Rights': 'Public Domain', 'ImageDescription': 'https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-334-FA; Photograph of seabed collected at Boca Chica Key, FL Keys, collected in November 2022 during USGS field activity 2022-334-FA', 'Description': 'https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-334-FA; Photograph of seabed collected at Boca Chica Key, FL Keys, collected in November 2022 during USGS field activity 2022-334-FA', 'Comment': 'Photograph of seabed collected at Boca Chica Key, FL Keys, collected in November 2022 during field activity 2022-334-FA', 'Keywords': 'coral reef, Remote Sensing, Boca Chica Key, Florida', 'ExternalMetadataLink': 'https://www1.usgs.gov/pir/api/identifiers/USGS:8fa37f5c-dd94-4f14-910e-860c5615b09d'}. All of the previously listed tags were the same for each image. Additionally, there were tags added to the dictionary object that would have a different value for each image depending on factors such as the image location and date and time when the image was captured. These tags and an example value are included as follows, as well as a description for why the values differ, as needed: 'GPSLatitude': '24.5528', 'GPSLongitude': '-81.6937', 'DateTimeOriginal': 2022:11:12 17:31:34; Tags were added to each image by using the command: 'exiftool -@ text_file_dictionary.txt -csv=images_date_location.csv *.jpg'. To read out the imagery header information to a comma-separated values (CSV) file the command is: 'exiftool -csv *.jpg > allheaders.csv'. Specific tags may be specified with this command, if preferred . Person who carried out this activity:
    Emily A. Wei
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Research Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    ewei@usgs.gov
    Date: 28-Sep-2023 (process 5 of 5)
    A total of 23,948 JPEG images are included in this release (2022_334-FA_polecam_images) and can be viewed and downloaded on the Imagery Data System (IDS), https://cmgds.marine.usgs.gov/idsviewer/data_release/10.5066-P9KNCMFY. The images on the IDS are sorted by default from newest to oldest date-time collected. Person who carried out this activity:
    USGS SPCMSC Data Management Group
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, Florida
    USA

    727-502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov
    Data sources produced in this process:
    • 2022_334-FA_polecam_images
  3. What similar or related data should the user be aware of?
    Hatcher, Gerry A., 2021, Marfac Machine Vision Camera Interface: U.S. Geological Survey - Pacific Coastal and Marine Science Center, GitLab.

    Online Links:

    Forde, A.S., Wei, E.A., and Stalk, C.A., 20231116, Archive of Chirp Subbottom Profile, Imagery, and Geospatial Data Collected in 2022 from Boca Chica Key, Florida: U.S. Geological Survey data release doi:10.5066/P95M6VHT, U.S. Geological Survey – St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    This dataset was from a single research cruise with exact instrumentation and set up and were therefore internally consistent. Methods were employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment was isolated to obtain internal and external offset measurements with respect to the survey platform. All the critical measurements were recorded manually, and digitally entered into their respective programs. Position data for the imagery was captured in real-time from a serial string output by an SP90M GNSS receiver and a Trimble Zephyr GNSS Antenna, with a real-time GGA solution output from a serial string at 10 hertz (Hz). Position information was fed into the Spinview software and written into a comma separated value text file (.txt) for each camera shot. The real time navigation values were postprocessed utilizing NovAtel's GrafNav (version 8.9) against the FLKW NGS CORS station. The accuracy of the post-processed navigation data have an estimated 2-sigma accuracy of 4-7 centimeters (cm) in the horizontal. These data are not to be used for bathymetry or navigation. Please see the multibeam bathymetry metadata record (BocaChica_2022_MBES_metadata) of this data release for elevation information.
  2. How accurate are the geographic locations?
    Image positions have an estimated 2-sigma horizontal accuracy of 4-7 cm in the horizontal. The precision of the positions in the imagery headers were reduced due to field size limitations for storing latitude/longitude.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    All data fall within expected ranges.

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 Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS SPCMSC Data Management Group
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov
  2. What's the catalog number I need to order this data set? 2022_334-FA_polecam_images (*.jpg)
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 01-Nov-2023
Metadata author:
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Attn: USGS SPCMSC Data Management Group
600 4th Street South
St. Petersburg, FL
USA

(727) 502-8000 (voice)
gs-g-spcmsc_data_inquiries@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/2022-334-FA_BocaChica_Polecam_Imagery_metadata.faq.html>
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