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  4. Data Release 10.5066/P9R47TWT

Underwater photogrammetry products of Big Pine Ledge, Florida from images acquired using the SQUID-5 system in July 2021

By Gerry A. Hatcher, Christine J. Kranenburg, Jonathan A. Warrick, Stephen T. Bosse, David G. Zawada, Kimberly K. Yates, and Selena A. Johnson

https://doi.org/10.5066/P9R47TWT

Dates

Published: April 26, 2024

Data Collected: July 16, 2021 – July 20, 2021

Summary

Underwater images were collected using a towed-surface vehicle with multiple downward-looking underwater cameras developed by the U.S. Geological Survey (USGS). The system is named the Structure-from-Motion (SfM) Quantitative Underwater Imaging Device with Five Cameras (SQUID-5). The raw images and associated navigation data were collected at Big Pine Ledge, a coral reef located within the Florida Keys National Marine Sanctuary approximately eleven kilometers south of Big Pine Key, Florida. SQUID-5 was towed through the survey area using the USGS R/V Sallenger during the data collection from July 16–20, 2021. The images and position data acquired by the SQUID-5 system were then processed using SfM photogrammetry techniques to generate the point cloud, digital elevation model, and full-color orthomosaic data products presented here. The goal of this work was to generate very high (millimeter scale) resolution maps and a precisely co-registered, full color, orthomosaic image of the seabed at Big Pine Ledge with accurate geospatial location to support ongoing USGS research, including seafloor elevation change and stability modeling, and small-scale hydrodynamic flow modeling at millimeter scales over short time frames (event-driven and storms). These data will also enable other researchers and stakeholders to co-register and validate their imagery and ecological data in the area.

The raw images and navigation data used to create these products are available on the RSCC Simple Data Service at https://cmgds.marine.usgs.gov/data-services/rscc/SQUID/FL_2021_BigPineLedge/.

Imagery Data

  • Orthoimagery of Big Pine Ledge, Florida, 2021

    A seabed orthoimage was developed from underwater images collected at Big Pine Ledge, Florida, in July 2021 using the SQUID-5 camera system. The underwater images were processed using Structure-from-Motion (SfM) photogrammetry techniques. The orthoimage covers a rectangular area of seafloor approximately 650x120 meters (0.078 square kilometers) in size. It was created using image-averaging methods and saved as a tiled GeoTIFF raster at 5-millimeter resolution.

    Data Files

    SQUID5_BPL_2021_orthoaverage-5mm_cog.tif - 6.2 GB - MD5:32fd22841cab5b2677298dc42be07ad7

    Metadata Files

    SQUID5_BPL_2021_Orthoaverage_metadata.xml - 36.6 KB

    SQUID5_BPL_2021_Orthoaverage_metadata.txt - 35.9 KB

    Support Files

    OrthoImage_Color_Correction_Procedure.m - 5.9 KB

    Preview of dataset
    Full-resolution sample view of larger orthoaverage image showing a 27.5x19-m area of seafloor near Big Pine Ledge.

Location-Elevation Data

  • Point cloud data of Big Pine Ledge, Florida, 2021

    A three-dimensional point cloud (LAZ format) was developed from underwater images collected at Big Pine Ledge, Florida, in July 2021 using the SQUID-5 camera system and processed using Structure-from-Motion (SfM) photogrammetry techniques. Point cloud data include x,y,z positions, and RGB colors derived from the color-corrected imagery. LAS (and its compressed form, LAZ) is an open format developed for the efficient use of point cloud lidar data.

    Data Files

    SQUID5_BPL_2021_PointCloud-A-1.laz - 2.9 GB - MD5:9236336ef3c0fa62b41171197b673af9

    SQUID5_BPL_2021_PointCloud-B-1.laz - 4.9 GB - MD5:7937622b1333f87dde011dbe9b041f78

    SQUID5_BPL_2021_PointCloud-C-0.laz - 411.5 MB - MD5:ef99aeeafe7b6c72de9f106a50c9a31d

    SQUID5_BPL_2021_PointCloud-C-1.laz - 4.9 GB - MD5:1ab7293f41e3b2f3c5417108562f4ecc

    SQUID5_BPL_2021_PointCloud-D-0.laz - 1.4 GB - MD5:22aa390f93dd2ece07f43d626c958167

    SQUID5_BPL_2021_PointCloud-D-1.laz - 3.9 GB - MD5:a5fd5c9a87644a690909ea1226bed164

    SQUID5_BPL_2021_PointCloud-E-0.laz - 1.1 GB - MD5:c95323c7e81f342465a66d4243e75635

    SQUID5_BPL_2021_PointCloud-E-1.laz - 2.2 GB - MD5:dbb2c72181c8a666b4ca8f2ed8522035

    Metadata Files

    SQUID5_BPL_2021_PointCloud_metadata.xml - 30.9 KB

    SQUID5_BPL_2021_PointCloud_metadata.txt - 30.5 KB

    Preview of dataset
    Sample view of larger 3D point cloud data set showing coral rubble on seafloor at Big Pine Ledge.
  • Digital elevation model (DEM) of Big Pine Ledge, Florida, 2021

    A digital elevation model (DEM) was created from underwater images collected at Big Pine Ledge, Florida, in July 2021 using the SQUID-5 camera system. The underwater images were processed using Structure-from-Motion (SfM) photogrammetry techniques into a classified two-class ('unclassified' and 'low noise') 3D point cloud. The DEM was created in Metashape (ver. 1.6.6) from the point cloud, and includes points from both classes. The DEM covers a rectangular area of seafloor approximately 650x120 meters (0.078 square kilometers) in size and was saved as a GeoTIFF raster at 1-centimeter resolution.

    Data Files

    SQUID5_BPL_2021_DEM_1cm_cog.tif - 2.0 GB - MD5:3a75dde57207944ec4066d9e4de60ac4

    Metadata Files

    SQUID5_BPL_2021_DEM_metadata.xml - 31.3 KB

    SQUID5_BPL_2021_DEM_metadata.txt - 30.8 KB

    Preview of dataset
    5-cm-resolution sample view of the digital elevation model (DEM) of Big Pine Ledge.

Related Field Activities

  • 2021-301-FA - View Details
  • 2021-633-FA - View Details

    • Suggested Citation

    Hatcher, G.A., Kranenbug, C.J., Warrick, J.A., Bosse, S.T., Zawada, D.G., Yates, K.K., Johnson, S.A., 2024, Underwater photogrammetry products of Big Pine Ledge from images acquired using the SQUID-5 system in July 2021: U.S. Geological Survey data release, http://doi.org/10.5066/P9R47TWT.

Overview Image

Overview image of data release

Overview Map