Data

p-rock (probability of rock) grids from the Darwin Harbour 2011 Marine Survey (GA0333)

Geoscience Australia
Siwabessy, J.
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/83950&rft.title=p-rock (probability of rock) grids from the Darwin Harbour 2011 Marine Survey (GA0333)&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/83950&rft.description=This dataset contains probability values of rocky/hard seabed (multibeam angular backscatter response derived product) from seabed mapping surveys in Darwin Harbour. The survey was undertaken during the period 24 June to 20 August 2011 by iXSurvey Australia Pty Ltd for the Department of Natural Resources, Environment, The Arts and Sport (NRETAS) in collaboration with Geoscience Australia (GA), the Darwin Port Corporation (DPC) and the Australian Institute of Marine Science (AIMS) using GA's Kongsberg EM3002D multibeam sonar system and DPC's vessel Matthew Flinders. The survey obtained detailed bathymetric map of Darwin Harbour. Refer to the GA record ' Mapping and Classification of Darwin Harbour Seabed' for further information on processing techniques applied (GeoCat: 79212; GA Record: 2015/xx)Maintenance and Update Frequency: asNeededStatement: The backscatter data were processed using CMST-GA MB Process v10.10.17.0 software on the National Computational Infrastructure (NCI) supercomputer at the Australian National University. In the process of removing the angular dependence from the backscatter for a consistent backscatter strength across the swath in various incidence angles (for a homogeneous seafloor), the angular backscatter response was calculated in a 1° bin of incidence angle and averaged within the sliding window. The angular backscatter response is an intrinsic property of the seafloor, illustrating that the backscatter strength changes with the angle of incidence and is dependent on substrate type. The angular backscatter response curve data was analysed to produce a dataset indicating the probability of seabed hardness. The underwater video-derived hardness classifications were first used with existing seabed hardness data from DLRM to identify known areas of rocky seabed. The angular backscatter response curves were then extracted from the identified rocky areas and an average of the angular backscatter response curves was calculated. This was completed to determine a reference curve of rocky seabed. This curve was used as a reference and compared to all other angular backscatter response curves using the Kolmogorov-Smirnov goodness of fit test to estimate the probability of the rocky seabed (p-rock). Finally, the Inverse Distance Weighted interpolation technique was used to produce a continuous layer of the p rock for the whole study area.&rft.creator=Siwabessy, J. &rft.date=2015&rft.coverage=westlimit=130.69; southlimit=-12.59; eastlimit=130.94; northlimit=-12.32&rft.coverage=westlimit=130.69; southlimit=-12.59; eastlimit=130.94; northlimit=-12.32&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=environment&rft_subject=Marine Data&rft_subject=Backscatter Grid&rft_subject=backscatter&rft_subject=multibeam&rft_subject=marine survey&rft_subject=marine environmental baselines&rft_subject=AU-NT&rft_subject=Marine Geoscience&rft_subject=EARTH SCIENCES&rft_subject=GEOLOGY&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
Cite Saved to MyRDA Save to MyRDA

Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

CC-BY

4.0

http://creativecommons.org/licenses/

WWW:LINK-1.0-http--link

Australian Government Security ClassificationSystem

https://www.protectivesecurity.gov.au/Pages/default.aspx

WWW:LINK-1.0-http--link

Access:

Open

Brief description

This dataset contains probability values of rocky/hard seabed (multibeam angular backscatter response derived product) from seabed mapping surveys in Darwin Harbour. The survey was undertaken during the period 24 June to 20 August 2011 by iXSurvey Australia Pty Ltd for the Department of Natural Resources, Environment, The Arts and Sport (NRETAS) in collaboration with Geoscience Australia (GA), the Darwin Port Corporation (DPC) and the Australian Institute of Marine Science (AIMS) using GA's Kongsberg EM3002D multibeam sonar system and DPC's vessel Matthew Flinders. The survey obtained detailed bathymetric map of Darwin Harbour. Refer to the GA record ' Mapping and Classification of Darwin Harbour Seabed' for further information on processing techniques applied (GeoCat: 79212; GA Record: 2015/xx)

Lineage

Maintenance and Update Frequency: asNeeded
Statement: The backscatter data were processed using CMST-GA MB Process v10.10.17.0 software on the National Computational Infrastructure (NCI) supercomputer at the Australian National University. In the process of removing the angular dependence from the backscatter for a consistent backscatter strength across the swath in various incidence angles (for a homogeneous seafloor), the angular backscatter response was calculated in a 1° bin of incidence angle and averaged within the sliding window. The angular backscatter response is an intrinsic property of the seafloor, illustrating that the backscatter strength changes with the angle of incidence and is dependent on substrate type. The angular backscatter response curve data was analysed to produce a dataset indicating the probability of seabed hardness. The underwater video-derived hardness classifications were first used with existing seabed hardness data from DLRM to identify known areas of "rocky" seabed. The angular backscatter response curves were then extracted from the identified "rocky" areas and an average of the angular backscatter response curves was calculated. This was completed to determine a reference curve of "rocky" seabed. This curve was used as a reference and compared to all other angular backscatter response curves using the Kolmogorov-Smirnov goodness of fit test to estimate the probability of the "rocky" seabed (p-rock). Finally, the Inverse Distance Weighted interpolation technique was used to produce a continuous layer of the p rock for the whole study area.

Issued: 2015

This dataset is part of a larger collection

Click to explore relationships graph
Help

Related Organisations

Related People

130.94,-12.32 130.94,-12.59 130.69,-12.59 130.69,-12.32 130.94,-12.32

130.815,-12.455

text: westlimit=130.69; southlimit=-12.59; eastlimit=130.94; northlimit=-12.32

Subjects
AU-NT | Backscatter Grid | Earth Sciences | Geology | Marine Data | Marine Geoscience | Published_External | backscatter | environment | marine environmental baselines | marine survey | multibeam |

User Contributed Tags    

Login to tag this record with meaningful keywords to make it easier to discover

Other Information
Download the file (File download)

uri : https://d28rz98at9flks.cloudfront.net/83950/83950.zip

Identifiers
Similar data you may be interested in: