CEAMARC-CASO 12kHz Bathymetry - data collected from voyage 3, 2007-2008 of the Aurora Australis

Bathymetry data was collected using a Simrad EK60 echosounder. The sample data have been corrected for the relative locations of GPS antenna, transducers and waterline. A sound-speed value of 1500 m/s was applied when calculating depth.

The seafloor depth itself was defined firstly as the depth of the sounder-detected bottom minus 10m (contact Simrad for more information about their bottom-detection algorithm), and then modified manually where necessary to ensure that the line followed the seafloor as perceived by eye from the echogram. This is therefore a subjective process, and the true seafloor depth may vary from the perceived depth by several hundred metres in the worst cases. The greatest uncertainties are typically at greater depths, e.g. greater than 1000 m.

This seafloor depth line therefore refers to the approximate depth (not range from transducer) of the seafloor less 10 m, i.e. 10 m should be added to the 'depth' values in the *.CSV file to give the 'true' seafloor depth.

Depths greater than 5000 m are not available due to the 12 kHz data not being logged any deeper than this.

These data are preliminary and subject to change.

Bathymetry data was exported during the voyage by Belinda Ronai. Post voyage enquiries however should be directed to Toby Jarvis.

Identification info

Alternate title: CEAMARC-CASO 12kHz Bathymetry - data collected from voyage 3, 2007-2008 of the Aurora Australis

Date (Publication): 2017-11-20

Edition: 1

Citation identifier

Dataset DOI

Title: Information and documentation - Digital object identifier system

Date (Publication): 2012-04-23

Citation identifier: ISO 26324:2012

Citation identifier: doi:10.4225/15/5a137397eab73

Originator

Jarvis, T.

Publisher

Australian Antarctic Data Centre

Principal investigator

JARVIS, TOBY

Collaborator

JARVIS, TOBY

Name: CAASM Metadata

Website: https://data.aad.gov.au/metadata/records/CEAMARC_CASO_200708030_BATHYMETRY

Status: Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Topic category

Oceans

Extent

N

S

E

W

Extent

Description: Temporal Coverage

Temporal extent

TimePeriod: 2007-12-16 2008-01-26

NASA/GCMD Earth Science Keywords

EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH
EARTH SCIENCE > OCEANS > OCEAN ACOUSTICS
EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY

Keywords

Simrad EK60 Echosounder

NASA/GCMD Earth Science Keywords

Acoustic Sounders

NASA/GCMD Earth Science Keywords

R/V AA > R/V Aurora Australis

NASA/GCMD Earth Science Keywords

AMD/AU
CEOS
AMD

NASA/GCMD Earth Science Keywords

OCEAN > SOUTHERN OCEAN
GEOGRAPHIC REGION > POLAR

Resource constraints

Use limitation: This metadata record is publicly available.

Resource constraints

Access constraints: licence

Other constraints: These data are publicly available for download from the provided URL.

Resource constraints

File type: Portable Network Graphic

Linkage: Creative Commons by Attribution logo

Title: Attribution 4.0 International (CC BY 4.0)

Website: https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license

Use constraints: licence

Other constraints: This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=CEAMARC_CASO_200708030_BATHYMETRY when using these data.

Language: English

Character encoding: UTF8

Distribution Information

Distributor

Distributor

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)

Australian Antarctic Division

203 Channel Highway

Kingston

Tasmania

7050

Australia

+61 3 6232 3244

+61 3 6232 3351 (facsimile)

Distributor

Fees: Free

Planned available datetime: 2017-11-20T00:00:00

Units of distribution: GB

Transfer size: 100

Distribution format

Echoview

OnLine resource: GET DATA
Request a copy of the data

OnLine resource: VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset.

Resource lineage

Statement: Raw data conists of 'bot', 'idx' and 'raw' files. The bot file contains information on a sounder detected bottom, the idx file is an index file and the raw file contains the ping data itself. These files are loadable/readable with SonarData Echoview software. In the process of loading raw files into Echoview 'EV' and 'evw' files are created. Setting used for processing data are preserved in the template 'Bathy_template_200708030.EV'. The Echoview software is used to export a time position series of depth data. Exported data is in comma delimited ASCII format and files contain information about the seafloor-exclusion line created during analysis of the CEAMARC-CASO hydroacoustic data (collected with a Simrad EK60 echosounder system). This line was exported from the 12 kHz 'post-processed' echogram, generating CSV files with the following headings: Ping_date (dd/mm/yyyy, UTC) Ping_time (hh:mm:ss, UTC) Ping_milliseconds (ms, UTC) Latitude (of the ping in decimal degrees, 999 if unknown) Longitude (of the ping in decimal degrees, 999 if unknown) Position_status (quality of the GPS fix-interpolation at the ping time, where 1=good, 3=uncertain, 4=unknown) Depth (of the surface-exclusion line in metres) Line_status (certainty of the line depth, where 0=bad, 1=good, 2=unverified, 3=no line) Ping_status (a user-specified status for each ping, ranging from 1-11) Altitude (in m, -9999.99 if unknown - not sure what this is) GPS_UTC_time (hh:mm:ss, -1 if unknown)

Hierarchy level: Dataset

Maintenance and update frequency: As needed

Maintenance note: DIF added to GCMD 2008-04-14 (Alicja Mosbauer). 2017-11-20 - record updated by Dave Connell - basic updates.

Metadata

Metadata identifier: string/CEAMARC_CASO_200708030_BATHYMETRY

Language: English

Character encoding: UTF8

Author

MOSBAUER, ALICJA

National Oceans Office

GPO Box 2139

Hobart

Tasmania

7000

AUSTRALIA

Sponsor

Australian Antarctic Division

Owner

AADC

Type of resource

Resource scope: Dataset

Alternative metadata reference

Title: gov.nasa.gsfc.gcmd

Citation identifier: c43b294b-2ca3-4637-b11b-ed25d6ab9638

Alternative metadata reference

Title: gov.nasa.gsfc.gcmd

Date (Last Revision): 2015-11-29T19:40:04

Identifier

Description: metadata.extraction_date

Alternative metadata reference

Title: gov.nasa.gsfc.gcmd

Citation identifier: 8.6

Metadata linkage: http://data.aad.gov.au/metadata/records/CEAMARC_CASO_200708030_BATHYMETRY
Point of truth for the metadata record

Date info (Creation): 2008-04-13T00:00:00

Date info (Last Update): 2017-11-19

Metadata standard

Title: ISO 19115-3

Edition: 2014

Other citation details: Version 1

Title: DIF to ISO 19115-1 Profile

Overviews

Spatial extent

N

S

E

W

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Associated resources

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