Structure-from-Motion underwater photos from the Florida Keys, 2019

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Frequently anticipated questions:

What does this data set describe?

Title:
Structure-from-Motion underwater photos from the Florida Keys, 2019
Abstract:
Underwater photos were collected using a new 5-camera system, the Structure-from-Motion (SfM) Quantitative Underwater Imaging Device with Five Cameras (SQUID-5). Images were collected in July 2019 by towing the SQUID-5 in 3 to 4 meters of water off of Islamorada in the Florida Keys. The five cameras were synchronized together and with a survey-grade Global Positioning System (GPS). Images were collected over diverse benthic settings, including living and senile reefs, rubble, and sand. The images are presented here in zipped files grouped by Julian day. The SQUID-5 system records images in bitmap (.bmp) format to maintain the highest resolution and bit depth, and these were the files used in SfM processing. The zip files also contain portable network graphics (.png) files, an open-source format, and which include Exif metadata, including GPS date, time, and latitude and longitude, copyright, keywords, and other fields.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-630-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-323-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Warrick, Jonathan A., Ritchie, Andrew C., Dailey, Evan T., Hatcher, Gerald A., Kranenburg, Christine, Zawada, David G., and Yates, Kimberly K., 2020, Structure-from-Motion underwater photos from the Florida Keys, 2019: data release DOI:10.5066/P9V7K7EG, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Warrick, Jonathan A., Ritchie, Andrew C., Dailey, Evan T., Hatcher, Gerald A., Kranenburg, Christine, Zawada, David G., and Yates, Kimberly K., 2020, SQUID-5 structure-from-motion point clouds, bathymetric maps, orthomosaics, and underwater photos of coral reefs in Florida, 2019: data release doi:10.5066/P9V7K7EG, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -80.62214
    East_Bounding_Coordinate: -80.52600
    North_Bounding_Coordinate: 24.91171
    South_Bounding_Coordinate: 24.89666
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P9V7K7EG/c4cc58fbf13f432d9f7634c5807af94f/Photos_browse.png (PNG)
    Example of underwater photo from one of the cameras.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 06-Jul-2019
    Ending_Date: 16-Jul-2019
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: TIFF
  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, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 17N
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -81
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.01
      Ordinates (y-coordinates) are specified to the nearest 0.01
      Planar coordinates are specified in METERS
      The horizontal datum used is NAD_1983_2011_UTM_Zone_17N.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Bitmap raster graphics (BMP) and portable network graphics (PNG) image files
    Entity_and_Attribute_Detail_Citation:
    Windows device-independent storage format and portable network graphics

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Jonathan A. Warrick
    • Andrew C. Ritchie
    • Evan T. Dailey
    • Gerald A. Hatcher
    • Christine Kranenburg
    • David G. Zawada
    • Kimberly K. Yates
  2. Who also contributed to the data set?
    Data collection was funded by U.S. Geological Survey
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-460-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These photos were collected to determine the accuracy, precision, and effectiveness of the new SQUID-5 camera platform.

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: Jul-2019 (process 1 of 3)
    Data Collection: Photographs were collected in bitmap (bmp) format in synchronized quintets by the SQUID-5 system, towed behind the R/V Sallenger during USGS field activity 2019-630-FA (aka 2019-323-FA). Image collection frequency was 2 Hz, and a post-processed kinematic (PPK) GPS position was recorded for each collection instant. Image gain settings were adjusted as needed depending on water depth and lighting conditions. Aperture and shutter speed were consistent for each group of photos at a study site. Image files were named programmatically with the last two digits of the camera's serial number, a 14-digit UTC datetime value formatted as yyyymmddhhmmss, thousandths of seconds, and the sequential image number for that camera. For example, 'CAM30-20190713152206_462-209.bmp' means camera 30, July 13, 2019, 15:22:06.462 (UTC), file number 209. Images were matched with GPS position data based on the timestamp of the image, and the position data were imported into the exif header or each png image file.
    Date: 19-Oct-2020 (process 2 of 3)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 17-Mar-2021 (process 3 of 3)
    Corrected working URL links to cmgds data repository to the actual published links Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan A. Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@usgs.gov
  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 horizontal and vertical accuracies of the surface models were compared against GPS survey data of known features covered by the survey.
  2. How accurate are the geographic locations?
    SfM-based measurements of the Sediment Elevation Table (SET) stations were within 3 cm of the total uncertainty of the field-based GPS measurements. The average horizontal scaling of the models is between 0.016 and 0.024 percent of water depth.
  3. How accurate are the heights or depths?
    SfM-based measurements of the Sediment Elevation Table (SET) stations were within 3 cm of the total uncertainty of the field-based GPS measurements. The average horizontal scaling of the models is between 0.016 and 0.024 percent of water depth.
  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:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in BMP and PNG formats contained in a single zip file, along with CSDGM FGDC-compliant metadata, and a browse image map of the data (.png). The image files are named with the following convention: camera serial number, 14-digit UTC datetime value, thousandths of seconds, and sequential image number for specified camera. The PNG image files contain Exif metadata, including GPS time and position data, and are included as an open-source format for preservation purposes.
  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?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with image viewing software.

Who wrote the metadata?

Dates:
Last modified: 17-Mar-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-460-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P9V7K7EG/SQUID5_Florida_UnderwaterPhotos.faq.html>
Generated by mp version 2.9.50 on Tue Oct 26 16:49:32 2021