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OAS accession Detail for 0253462, meta_version: 8. Current meta_version is: 8
| << previous | |revision: 8 |
| accessions_id: | 0253462 | archive |
|---|---|
| Title: | Benthic cover derived from 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 from 2021-09-13 to 2021-09-14 (NCEI Accession 0253462) |
| Abstract: | The benthic cover and fishing-net related data described in this dataset are derived from the GIS analysis of benthic orthophotos. Source imagery was collected by snorkelers using a Structure from Motion (SfM) approach from at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands (NWHI). This data was collected from September 13-14, 2021 as part of a joint marine debris removal mission with the NOAA Fisheries, Ecosystem Sciences Division (ESD) and non-profit organization Papahānaumokuākea Marine Debris Project aboard the charter vessel M/V IMUA. This 2021 benthic cover dataset follows a 2018 benthic cover dataset from SfM surveys of net-impacted and paired control sites; sites were revisited in 2021 to compare the benthic composition of net-impacted sites to control sites three years after net removal. Only a subset of 2018 sites were successfully relocated in 2021, therefore new paired control sites were also included. The photographs from each site were processed using Agisoft Metashape software to generate orthomosaic images that were analyzed in ArcGIS for benthic cover using a random point approach. For net-impacted sites, twenty random points were assigned to each orthophoto within the shapefile of the 2018 net polygon overlaid in the appropriate area. For control sites, the net shapefile from 2018 was overlaid in the center of the image and 20 random points were assigned within that polygon. For all sites, each point was classified into one of six benthic categories: algae, sand, bare substrate, coral, sponge, or crustose coralline algae (CCA). The annotated points for each site were converted to percent cover for each benthic category. |
| Date received: | 20230210 |
| Start date: | 20210913 |
| End date: | 20210914 |
| Seanames: | Coastal Waters of Hawaii, North Pacific Ocean, Papahānaumokuākea Marine National Monument |
| West boundary: | -175.817246 |
| East boundary: | -175.7902661 |
| North boundary: | 27.89114188 |
| South boundary: | 27.82745706 |
| Observation types: | derived products, in situ |
| Instrument types: | photograph |
| Datatypes: | biological data, DEPTH - BOTTOM, REEF AND/OR BOTTOM REGIME - PERCENT COVER |
| Submitter: | Trick, Kevin |
| Submitting institution: | US DOC; NOAA; NMFS; Pacific Islands Fisheries Science Center |
| Collecting institutions: | US DOC; NOAA; NMFS; Pacific Islands Fisheries Science Center; Ecosystem Sciences Division |
| Contributing projects: | CORAL REEF STUDIES |
| Platforms: | |
| Number of observations: | |
| Supplementary information: | Submission Package ID: 4KDA2E Note: The dataset abstract references source imagery. These images were not included with this submission. In this accession, NCEI has archived multiple versions of these data. The latest (and best) version of these data has the largest version number. |
| Availability date: | |
| Metadata version: | 8 |
| Keydate: | 2022-05-11 14:00:35+00 |
| Editdate: | 2023-02-14 16:55:20+00 |