Structure from motion images collected during marine debris surveys at coral reef sites entangled with fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands from 2018/09/24 to 2018/10/03
The photographs described in this dataset were collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys conducted by snorkelers in search of derelict fishing nets. Surveys were conducted by the NOAA Fisheries, Ecosystem Sciences Division (ESD) from September 24 to October 3, 2018 at Pearl and Hermes Atoll during an ESD-led marine debris mission to the Northwestern Hawaiian Islands (NWHI) aboard the NOAA Ship Oscar Elton Sette. The lagoon at Pearl and Hermes was surveyed equally across the spatial gradient, from locations where derelict fishing nets are common to locations where derelict fishing nets have never been observed. During the 2018 mission, only a subset of marine debris surveys resulted in a SfM survey. Fishing nets were located during swim surveys and selected for SfM if the net was interacting with coral or hard substrate, the depth of the net was within ~1–4 m of the surface, and the area of the net fit within the 9 sq. meter SFM survey plot.
A complete SfM survey is comprised of three sets of images. Two sets were taken at each net-impact site, one series “before” and one series “after” the fishing net was removed from the reef. A final set was taken at a paired “control” site that was selected ≥50 m away from the net-impact site. During a SFM survey, a permanent 3 x 3 m plot was established around the center of the fishing net, and the survey plot was photographed using a back and forth swim pattern (“before” photos) for later processing using a SfM approach. The fishing net was then removed and the same area was photographed again in the same way (“after” photos). The paired control site was also photographed using the same method (“control” photos).
A complete SfM survey is comprised of three sets of images. Two sets were taken at each net-impact site, one series “before” and one series “after” the fishing net was removed from the reef. A final set was taken at a paired “control” site that was selected ≥50 m away from the net-impact site. During a SFM survey, a permanent 3 x 3 m plot was established around the center of the fishing net, and the survey plot was photographed using a back and forth swim pattern (“before” photos) for later processing using a SfM approach. The fishing net was then removed and the same area was photographed again in the same way (“after” photos). The paired control site was also photographed using the same method (“control” photos).
Dataset Citation
- Cite as: Ecosystem Sciences Division, Pacific Islands Fisheries Science Center (2020). Structure from motion images collected during marine debris surveys at coral reef sites entangled with fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands from 2018/09/24 to 2018/10/03. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/PIFSC-SfM-Images-HI. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:PIFSC-SfM-Images-HI
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NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
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NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2018-09-24 to 2018-10-03 |
Spatial Bounding Box Coordinates |
West: -175.821
East: -175.788
South: 27.827
North: 27.894
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Supplemental Information | Accessions: 0210740, 0210811, and 0210812 |
Purpose | The Papahānaumokuākea Marine National Monument (PMNM) includes the 1200 nautical mile chain of atolls and islets known as the Northwestern Hawaiian Islands (NWHI) that are geographically positioned as a repository for marine debris. Marine debris circulates within the North Pacific Subtropical Gyre until it encounters the atolls of the NWHI. The Ecosystem Sciences Division (ESD) at NOAA Fisheries has conducted both ship- and shore-based missions in the NWHI to survey for and remove derelict fishing gear and many other types of marine debris. Exploratory and opportunistic efforts began in 1996 that evolved into ~annual cruises. The collected photographs were processed using a structure from motion (SfM) approach to create orthophotos and analyzed in GIS for benthic cover. The purpose of the Structure from Motion (SfM) surveys at Pearl and Hermes Atoll is to understand whether derelict fishing nets significantly alter the benthic community composition of the reef. In addition, we investigated how net size and fouling level may vary the severity of this impact. This study leveraged SfM, an emerging photogrammetry technique, to allow efficient data collection alongside marine debris survey and removal efforts. |
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Last Modified: 2024-06-02T18:56:26Z
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov