Seafloor image annotations from the Sabrina upper slope, East Antarctica
Images that were too blurry, and those that were too far from or too close to the seafloor for analysis were not analysed. Distance to the seafloor was assessed based on the ratio of the distance between the laser pointers to the width of the computer screen, with the ratio for good images between 0...
id |
ftands:oai:ands.org.au::1408950 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC CAMERAS SHIPS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN |
spellingShingle |
oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC CAMERAS SHIPS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN Seafloor image annotations from the Sabrina upper slope, East Antarctica |
topic_facet |
oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC CAMERAS SHIPS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN |
description |
Images that were too blurry, and those that were too far from or too close to the seafloor for analysis were not analysed. Distance to the seafloor was assessed based on the ratio of the distance between the laser pointers to the width of the computer screen, with the ratio for good images between 0.018:1 and 0.064:1 (D. Osterhage, pers. comm.). Unfortunately, altimeter data could not be used to determine distance from the seafloor due to timing offsets that were not able to be resolved. Quantitative counts were not attempted due to variable image quality and oblique image angles, which would have led to inconsistencies in abundance data. Four camera tow transects were completed on the upper slope during survey IN2017_V01 using the Marine National Facility’s Deep Tow Camera. This system collected oblique facing still images with a Canon – 1DX camera and high definition video with a Canon – C300 system. Four SeaLite Sphere lights provided illumination and two parallel laser beams 10 cm apart provided a reference scale for the images. This dataset presents results from the analysis of the still imagery. All camera tows were run at a ship speed over the ground of approximately 2 knots. Several sensors were attached to the towed body, including a SBE 37 CTD for collection of salinity, temperature and pressure data, a Kongsberg Mesotech altimeter and a Sonardynne beacon to record the location of the towed body. Transects were run downslope from the continental shelf break, with images analysed over a depth range of ~495 m to 670-725 m. Biota and substrates were characterised for every fifth image according to the CATAMI image classification scheme (Collaborative and Automated Tools for Analysis of Marine Imagery, Althaus et al., 2015). Images were loaded into the online platform SQUIDLE+ for analysis. Biota were counted as presence/absence of all visible biota for each image. Percent biological cover and substrate type for the whole image was calculated based on analysis of 30 random points across each image. Percent cover calculations were standardised according to the proportion of scored points on each image, excluding those that were too dark to classify. A total of 203 images were analysed. Images are available from: http://dap.nci.org.au/thredds/remoteCatalogService?catalog=http://dapds00.nci.org.au/thredds/catalog/fk1/IN2017_V01_Sabrina_Seafloor/catalog.xml This dataset provides presence/absence data for taxa, % biological cover and substrate attributes determined from seafloor images from the Sabrina upper slope. These data provide an understanding of seabed habitats and diversity of taxa. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
Seafloor image annotations from the Sabrina upper slope, East Antarctica |
title_short |
Seafloor image annotations from the Sabrina upper slope, East Antarctica |
title_full |
Seafloor image annotations from the Sabrina upper slope, East Antarctica |
title_fullStr |
Seafloor image annotations from the Sabrina upper slope, East Antarctica |
title_full_unstemmed |
Seafloor image annotations from the Sabrina upper slope, East Antarctica |
title_sort |
seafloor image annotations from the sabrina upper slope, east antarctica |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.ands.org.au/seafloor-image-annotations-east-antarctica/1408950 https://data.aad.gov.au/metadata/records/AAS_4333_IN2017_V01_seafloor_imagery_annotations https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4333 https://data.aad.gov.au/eds/4876/download https://data.aad.gov.au/metadata/records/AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations |
op_coverage |
Spatial: northlimit=-63; southlimit=-66; westlimit=113; eastLimit=122 Temporal: From 2017-01-14 to 2017-03-05 |
long_lat |
ENVELOPE(19.082,19.082,69.123,69.123) ENVELOPE(113,122,-63,-66) |
geographic |
Southern Ocean East Antarctica Kongsberg |
geographic_facet |
Southern Ocean East Antarctica Kongsberg |
genre |
Antarc* Antarctica East Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica East Antarctica Southern Ocean |
op_source |
https://data.aad.gov.au |
op_relation |
https://researchdata.ands.org.au/seafloor-image-annotations-east-antarctica/1408950 0da207ac-8faf-446f-a75c-cd139192e6d3 https://data.aad.gov.au/metadata/records/AAS_4333_IN2017_V01_seafloor_imagery_annotations https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4333 https://data.aad.gov.au/eds/4876/download https://data.aad.gov.au/metadata/records/AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations |
_version_ |
1766272946498699264 |
spelling |
ftands:oai:ands.org.au::1408950 2023-05-15T14:02:37+02:00 Seafloor image annotations from the Sabrina upper slope, East Antarctica AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-63; southlimit=-66; westlimit=113; eastLimit=122 Temporal: From 2017-01-14 to 2017-03-05 https://researchdata.ands.org.au/seafloor-image-annotations-east-antarctica/1408950 https://data.aad.gov.au/metadata/records/AAS_4333_IN2017_V01_seafloor_imagery_annotations https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4333 https://data.aad.gov.au/eds/4876/download https://data.aad.gov.au/metadata/records/AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations unknown Australian Ocean Data Network https://researchdata.ands.org.au/seafloor-image-annotations-east-antarctica/1408950 0da207ac-8faf-446f-a75c-cd139192e6d3 https://data.aad.gov.au/metadata/records/AAS_4333_IN2017_V01_seafloor_imagery_annotations https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4333 https://data.aad.gov.au/eds/4876/download https://data.aad.gov.au/metadata/records/AAS_4333_AAS_4333_IN2017_V01_seafloor_imagery_annotations https://data.aad.gov.au oceans EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC CAMERAS SHIPS AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN dataset ftands 2020-06-15T22:25:52Z Images that were too blurry, and those that were too far from or too close to the seafloor for analysis were not analysed. Distance to the seafloor was assessed based on the ratio of the distance between the laser pointers to the width of the computer screen, with the ratio for good images between 0.018:1 and 0.064:1 (D. Osterhage, pers. comm.). Unfortunately, altimeter data could not be used to determine distance from the seafloor due to timing offsets that were not able to be resolved. Quantitative counts were not attempted due to variable image quality and oblique image angles, which would have led to inconsistencies in abundance data. Four camera tow transects were completed on the upper slope during survey IN2017_V01 using the Marine National Facility’s Deep Tow Camera. This system collected oblique facing still images with a Canon – 1DX camera and high definition video with a Canon – C300 system. Four SeaLite Sphere lights provided illumination and two parallel laser beams 10 cm apart provided a reference scale for the images. This dataset presents results from the analysis of the still imagery. All camera tows were run at a ship speed over the ground of approximately 2 knots. Several sensors were attached to the towed body, including a SBE 37 CTD for collection of salinity, temperature and pressure data, a Kongsberg Mesotech altimeter and a Sonardynne beacon to record the location of the towed body. Transects were run downslope from the continental shelf break, with images analysed over a depth range of ~495 m to 670-725 m. Biota and substrates were characterised for every fifth image according to the CATAMI image classification scheme (Collaborative and Automated Tools for Analysis of Marine Imagery, Althaus et al., 2015). Images were loaded into the online platform SQUIDLE+ for analysis. Biota were counted as presence/absence of all visible biota for each image. Percent biological cover and substrate type for the whole image was calculated based on analysis of 30 random points across each image. Percent cover calculations were standardised according to the proportion of scored points on each image, excluding those that were too dark to classify. A total of 203 images were analysed. Images are available from: http://dap.nci.org.au/thredds/remoteCatalogService?catalog=http://dapds00.nci.org.au/thredds/catalog/fk1/IN2017_V01_Sabrina_Seafloor/catalog.xml This dataset provides presence/absence data for taxa, % biological cover and substrate attributes determined from seafloor images from the Sabrina upper slope. These data provide an understanding of seabed habitats and diversity of taxa. Dataset Antarc* Antarctica East Antarctica Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Southern Ocean East Antarctica Kongsberg ENVELOPE(19.082,19.082,69.123,69.123) ENVELOPE(113,122,-63,-66) |