Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006
Please see summary for important information on data quality and associated caveats. Readme - Bathymetry Files Data for BROKE-WEST 2006 1) Zipped folder contains .csv files created from each acoustics ev file for Transects 1 to 11. 2) These files contain subsections of each transect of variable leng...
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Format: | Dataset |
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Australian Ocean Data Network
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Online Access: | https://researchdata.ands.org.au/bathymetry-12khz-sounder-australis-2006/684761 https://data.aad.gov.au/metadata/records/BROKE-WEST_12kHZ_Bathy_Data http://data.aad.gov.au/eds/1467/download http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=BROKE-WEST_12kHZ_Bathy_Data |
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ftands:oai:ands.org.au::684761 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans SEAFLOOR TOPOGRAPHY EARTH SCIENCE BATHYMETRY/SEAFLOOR TOPOGRAPHY WATER DEPTH OCEAN ACOUSTICS BATHYMETRY 12kHz bathymetric data preliminary version Acoustic Sounders ECHO SOUNDERS SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
spellingShingle |
oceans SEAFLOOR TOPOGRAPHY EARTH SCIENCE BATHYMETRY/SEAFLOOR TOPOGRAPHY WATER DEPTH OCEAN ACOUSTICS BATHYMETRY 12kHz bathymetric data preliminary version Acoustic Sounders ECHO SOUNDERS SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006 |
topic_facet |
oceans SEAFLOOR TOPOGRAPHY EARTH SCIENCE BATHYMETRY/SEAFLOOR TOPOGRAPHY WATER DEPTH OCEAN ACOUSTICS BATHYMETRY 12kHz bathymetric data preliminary version Acoustic Sounders ECHO SOUNDERS SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
description |
Please see summary for important information on data quality and associated caveats. Readme - Bathymetry Files Data for BROKE-WEST 2006 1) Zipped folder contains .csv files created from each acoustics ev file for Transects 1 to 11. 2) These files contain subsections of each transect of variable length (usually between 50 and 100 km). 3) No data exists for files; Transect01_01 and 01_02 as the sea floor was greater than 5000m deep in these areas and was below the range set for the sounder. 4) Each file contains 11 columns of data; Ping_date, Ping_time, Ping_milliseconds, Latitude, Longitude, Position_status, Depth, Line_Status, Ping_status, Altitude, GPS_UTC time. 5) For practical purposes, the columns of interest will be Ping_date, Ping_time, Latitude, Longitude and Depth. Other columns are ancillary acoustics information and can be ignored. Line status should be 1 (meaning good) as sea floor was only picked when it could be easily defined. If the sea floor could not be visually defined or was deemed to uncertain, it was not picked in the echogram. Hence sea floor may not be totally contiguous. 6) Depth of the sea floor was only defined for those areas deemed to be 'on transect', i.e. straight transects for acoustics survey purposes. Deviations from the transect, i.e. to pick up moorings, conduct target or routine trawls or visit nice looking bergs were deemed 'off transect' and were excluded from the analysis. 7) Sea floor depth was primarly defined for the purposes of the acoustics analysis, i.e. exclusion from the echograms. Hence the values in the files are for the 'sea floor exclusion line' that is set above the true sea floor in order to exclude noise from the analysis. This means the sea floor depths in these files are likely to be an underestimate of the true depth. The uncertainty is likely to be of the order of 2 to 10m. 8) Another source of error is that depth was calculated with values of absorption coefficient and sound speed set to default values derived from pre-cruise hydrographic data. One value for each parameter was applied to the whole data set. These values were; 0.028 dB/m (120 KhZ), 0.010 dB/m (38kHz), 0.041 dB/m (200 kHz), 0.0017 dB/m (12kHz - bathy sounder) for absorption coefficient and 1456 m/s for sound speed. 9) These values will be recalculated from the oceanographic data derived during the voyage and applied to the data set during post-processing (forthcoming analyses for May-June 2006). Revision of these parameters may cause a slight shift in the calculated depths, although this is likely to be small. 10) Reprocessing of the data may also result in more accurate bottom detection. This data should be available post June 2006 and will be sent to interested parties as soon as it is completed. 11) Dataset was created by Esmee van Wijk. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006 |
title_short |
Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006 |
title_full |
Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006 |
title_fullStr |
Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006 |
title_full_unstemmed |
Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006 |
title_sort |
bathymetry data from the 12khz sounder on the broke-west voyage of the aurora australis, 2006 |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.ands.org.au/bathymetry-12khz-sounder-australis-2006/684761 https://data.aad.gov.au/metadata/records/BROKE-WEST_12kHZ_Bathy_Data http://data.aad.gov.au/eds/1467/download http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=BROKE-WEST_12kHZ_Bathy_Data |
op_coverage |
Spatial: northlimit=-60; southlimit=-70; westlimit=30; eastLimit=80 Temporal: From 2006-01-02 to 2006-03-12 |
long_lat |
ENVELOPE(30,80,-60,-70) |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica aurora australis Southern Ocean |
genre_facet |
Antarc* Antarctica aurora australis Southern Ocean |
op_source |
https://data.aad.gov.au |
op_relation |
https://researchdata.ands.org.au/bathymetry-12khz-sounder-australis-2006/684761 052dd6cd-9322-41e2-a60c-b85f2dd993cf https://data.aad.gov.au/metadata/records/BROKE-WEST_12kHZ_Bathy_Data http://data.aad.gov.au/eds/1467/download http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=BROKE-WEST_12kHZ_Bathy_Data |
_version_ |
1766245569469087744 |
spelling |
ftands:oai:ands.org.au::684761 2023-05-15T13:46:55+02:00 Bathymetry Data from the 12KHZ sounder on the BROKE-West voyage of the Aurora Australis, 2006 AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-60; southlimit=-70; westlimit=30; eastLimit=80 Temporal: From 2006-01-02 to 2006-03-12 https://researchdata.ands.org.au/bathymetry-12khz-sounder-australis-2006/684761 https://data.aad.gov.au/metadata/records/BROKE-WEST_12kHZ_Bathy_Data http://data.aad.gov.au/eds/1467/download http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=BROKE-WEST_12kHZ_Bathy_Data unknown Australian Ocean Data Network https://researchdata.ands.org.au/bathymetry-12khz-sounder-australis-2006/684761 052dd6cd-9322-41e2-a60c-b85f2dd993cf https://data.aad.gov.au/metadata/records/BROKE-WEST_12kHZ_Bathy_Data http://data.aad.gov.au/eds/1467/download http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=BROKE-WEST_12kHZ_Bathy_Data https://data.aad.gov.au oceans SEAFLOOR TOPOGRAPHY EARTH SCIENCE BATHYMETRY/SEAFLOOR TOPOGRAPHY WATER DEPTH OCEAN ACOUSTICS BATHYMETRY 12kHz bathymetric data preliminary version Acoustic Sounders ECHO SOUNDERS SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR dataset ftands 2020-01-05T21:05:40Z Please see summary for important information on data quality and associated caveats. Readme - Bathymetry Files Data for BROKE-WEST 2006 1) Zipped folder contains .csv files created from each acoustics ev file for Transects 1 to 11. 2) These files contain subsections of each transect of variable length (usually between 50 and 100 km). 3) No data exists for files; Transect01_01 and 01_02 as the sea floor was greater than 5000m deep in these areas and was below the range set for the sounder. 4) Each file contains 11 columns of data; Ping_date, Ping_time, Ping_milliseconds, Latitude, Longitude, Position_status, Depth, Line_Status, Ping_status, Altitude, GPS_UTC time. 5) For practical purposes, the columns of interest will be Ping_date, Ping_time, Latitude, Longitude and Depth. Other columns are ancillary acoustics information and can be ignored. Line status should be 1 (meaning good) as sea floor was only picked when it could be easily defined. If the sea floor could not be visually defined or was deemed to uncertain, it was not picked in the echogram. Hence sea floor may not be totally contiguous. 6) Depth of the sea floor was only defined for those areas deemed to be 'on transect', i.e. straight transects for acoustics survey purposes. Deviations from the transect, i.e. to pick up moorings, conduct target or routine trawls or visit nice looking bergs were deemed 'off transect' and were excluded from the analysis. 7) Sea floor depth was primarly defined for the purposes of the acoustics analysis, i.e. exclusion from the echograms. Hence the values in the files are for the 'sea floor exclusion line' that is set above the true sea floor in order to exclude noise from the analysis. This means the sea floor depths in these files are likely to be an underestimate of the true depth. The uncertainty is likely to be of the order of 2 to 10m. 8) Another source of error is that depth was calculated with values of absorption coefficient and sound speed set to default values derived from pre-cruise hydrographic data. One value for each parameter was applied to the whole data set. These values were; 0.028 dB/m (120 KhZ), 0.010 dB/m (38kHz), 0.041 dB/m (200 kHz), 0.0017 dB/m (12kHz - bathy sounder) for absorption coefficient and 1456 m/s for sound speed. 9) These values will be recalculated from the oceanographic data derived during the voyage and applied to the data set during post-processing (forthcoming analyses for May-June 2006). Revision of these parameters may cause a slight shift in the calculated depths, although this is likely to be small. 10) Reprocessing of the data may also result in more accurate bottom detection. This data should be available post June 2006 and will be sent to interested parties as soon as it is completed. 11) Dataset was created by Esmee van Wijk. Dataset Antarc* Antarctica aurora australis Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Southern Ocean ENVELOPE(30,80,-60,-70) |