Structure from motion images collected during marine debris surveys at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018 and 2021

Description

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) at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands (NWHI). Initial surveys occurred from September 24 - October 3, 2018 during an ESD-led marine debris removal mission aboard the NOAA Ship Oscar Elton Sette, and follow-up surveys occurred from September 13-14, 2021 on a joint mission with non-profit organization Papahanaumokuakea Marine Debris Project aboard the M/V IMUA.

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. During a SFM survey, a permanent 3 x 3 m plot was established around the center of the fishing net, and the net was photographed using a back and forth swim pattern ("before" photos) for later processing using a SfM approach. The net was then removed and the same area was photographed again in the same way ("after" photos). A nearby (>50 m distant) paired control site was also photographed using the same method ("control" photos).

During the 2021 mission, relocation of all paired sites where "after" and "control" photos were taken in 2018 was attempted; if found, the permanent 3 x 3m plot was reimaged using the same SfM approach. Only a subset of 2018 sites were successfully relocated in 2021 (12 "after" sites, 8 "control" sites), and five new nearby "control" sites had to be established to fulfill the paired study design.

Resources

Name Format Description Link
SfM_MarineDebris_ControlImages_PHR_2018 Unknown Benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys at "control sites" near fishing net removal sites. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Photos are organized by site in the "Control Images" folder. See Control Images metadata file for site information. Open resource
SfM_MarineDebris_ControlImagesMetadata_PHR_2018.csv Unknown Metadata for benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys at control sites near fishing net removal sites. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Open resource
SfM_MarineDebris_BeforeImages_PHR_2018 Unknown Benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys "before" the fishing net was removed from the reef. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Photos are organized by site in the "Before Images" folder. See Before Images metadata file for site information. Open resource
SfM_MarineDebris_BeforeImagesMetadata_PHR_2018.csv Unknown Metadata for benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys "before" the fishing net was removed from the reef. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Open resource
SfM_MarineDebris_AfterImagesMetadata_PHR_2018.csv Unknown Metadata for benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys "after" the fishing net was removed from the reef. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Open resource
SfM_MarineDebris_AfterImages_PHR_2018 Unknown Benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys "after" the fishing net was removed from the reef. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2018. Photos are organized by site in the "After Images" folder. See After Images metadata file for site information. Open resource
SfM_MarineDebris_ImpactImages_PHR_2021 Unknown Benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at net-impact sites 3 years after derelict fishing nets were removed at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2021. Photos are organized by site in the "Impact Images" folder. See Impact Images metadata file (SfM_MarineDebris_ImpactImagesMetadata_PHR_2021.csv) for site information. Open resource
SfM_MarineDebris_ImpactImagesMetadata_PHR_2021.csv Unknown Metadata for benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at net impact sites at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2021, three years post net-removal. Open resource
SfM_MarineDebris_ControlImagesMetadata_PHR_2021.csv Unknown Metadata for benthic imagery collected at using a Structure from Motion (SfM) approach during in-water marine debris swim surveys. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at control coral reef sites at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2021. Open resource
SfM_MarineDebris_ControlImages_PHR_2021 Unknown Benthic imagery collected using a Structure from Motion (SfM) approach during in-water marine debris swim surveys at "control sites" near fishing net removal sites. Surveys were conducted by the NOAA Fisheries Ecosystem Sciences Division at coral reef sites entangled with derelict fishing nets at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands in 2021 Photos are organized by site in the "Control Images" folder. See Control Images metadata file (SfM_MarineDebris_ControlImagesMetadata_PHR_2021.csv) for site information. Open resource
2018 Marine Debris Removal and Assessment in the Northwestern Hawaiian Islands Unknown Story map about marine debris removal efforts in 2018 with images and captions describing work that was conducted. Open resource
Global Change Master Directory (GCMD) Keywords Unknown The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. Open resource
Full Metadata Record Unknown View the complete metadata record on InPort for more information about this dataset. Open resource
NOAA Data Management Plan (DMP) PDF NOAA Data Management Plan for this record on InPort. Open resource
Marine Debris Research and Removal in the Northwestern Hawaiian Islands Unknown Information about marine debris research and removal efforts in Northwestern Hawaiian Islands by Pacific Islands Fisheries Science Center Open resource
Pacific Islands Fisheries Science Center Website Unknown Pacific Island Fisheries Science Center homepage Open resource

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