TemperateReefBase Geonetwork Catalogue
Sea-ice freeboard derived from airborne laser scanner
The dataset submitted here is 'Sea-ice freeboard derived from airborne laser scanner'.
Between 2007 and 2012, the Australian Antarctic program operated a scanning LiDAR system and other scientific instruments for sea-ice geophysical surveys in East Antarctica. For example see Lieser et al. [2013] for the 2012 survey. The dataset here provides the sea-ice freeboard (i.e. elevation above sea level) along various helicopter flight lines of the 2012 survey in the sea-ice zone between 113 degE and 123 degE.
The data collection was based on:
- Riegl LMS Q240i-60 scanning LiDAR, measuring sea ice elevation above the WGS84 reference ellipsoid;
- Hasselblad H3D II 50 camera, taking aerial photographs at about 13 cm resolution every 3-5 seconds (older digital camera used in 2007);
- inertial navigation and global positioning system, OxTS RT-4003.
The following geophysical corrections were applied to the sea-ice elevations to derive the sea-ice freeboard:
- geoid correction (from the EGM2008 Earth gravity model);
- mean ocean dynamic topography correction (from the DTU Space model - DTU10MDT);
- ocean tide correction (from the Earth and Space Research CATS2008 Antarctic tide model);
- atmospheric pressure (inverse barometer effect) correction from ECMWF data (4-year average) and ship-board underway observations.
The geophysical corrections have been validated along selected flight lines by extracting ocean surface elevations from leads between ice floes as identified in the aerial photography.
Contained in this dataset are the following files:
- a netCDF file for 8 selected flights of the 2012 survey containing sea-ice freeboard values;
- a postscript file for 4 of the 8 selected flights showing the residuals from the applied geophysical corrections. These 4 flights were selected on the basis of having a good spread of observable leads along the entire flight line that enabled the extraction of ocean surface elevations.
Simple
Identification info
- Alternate title
- Sea-ice freeboard derived from airborne laser scanner
- Date (Publication)
- 2019-03-05
- Edition
- 2
- 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:10.26179/5c7df733be942
Originator
Publisher
Principal investigator
Principal investigator
Collaborator
Collaborator
- Name
- CAASM Metadata
- Purpose
- Derive combined sea-ice and snow elevation as intermediate step to sea-ice thickness data.
- Status
- Completed
Custodian
- Topic category
-
- Climatology, meteorology, atmosphere
- Oceans
Extent
))
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 2012-09-25 2012-11-06
- Title
- Towards high resolution estimates of East Antarctic pack ice thickness
- Date (Publication)
- 2016
Author
Publisher
- Name
- PhD thesis
- Title
- RAPPLS Surveys (Radar, Aerial Photography, Pyrometer, and Laser Scanning system) made during the SIPEX II voyage of the Aurora Australis, 2012
- Date (Publication)
- 2013
- Citation identifier
- doi:10.4225/15/57749CB4652C4
Author
Publisher
- Name
- CAASM Metadata
- NASA/GCMD Earth Science Keywords
-
- EARTH SCIENCE > CRYOSPHERE > SEA ICE > FREEBOARD
- NASA/GCMD Earth Science Keywords
-
- AIRBORNE LASER SCANNER
- CAMERAS
- NASA/GCMD Earth Science Keywords
-
- HELICOPTER
- NASA/GCMD Earth Science Keywords
-
- AMD/AU
- AMD
- CEOS
- NASA/GCMD Earth Science Keywords
-
- 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, but owing to their size are placed ona cloud service on request.
Resource constraints
- File type
- Portable Network Graphic
- 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=RAPPLS_TotalFreeboard when using these data.
- Language
- English
- Character encoding
- UTF8
Distribution Information
Distributor
Distributor
Distributor
- Fees
- Free
- Planned available datetime
- 2019-03-05T00:00:00
- Units of distribution
- GB
- Transfer size
- 16
- Distribution format
-
- NetCDF
OnLine resource
- Protocol
- WWW:LINK-1.0-http--link
- Name of the resource
- GET DATA > https://data.aad.gov.au/eds/4853/download
- Description
- Request a copy of the data
- Function
- Access File
- OnLine resource
-
PROJECT HOME PAGE
Public information for AAS project 4301
- OnLine resource
-
VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset.
- OnLine resource
-
VIEW RELATED INFORMATION
Metadata record for a related dataset
Resource lineage
- Statement
- The quality of this dataset is affected by the vertical movement of the airframe: the helicopter provides a vibrating mounting point for the laser scanner and associated instrumentation. The Inertial Motion Unit (IMU) was not able to capture the full spectrum of small-scale vibrations. Hence the derived total freeboard is affected by some instrument associated noise. Consequently: * The data exhibit approximately 0.2 m vertical scatter due to uncharacterised vibration at the LIDAR head (compared to the same instrument in a fixed-wing aircraft); * In 2007, a single frequency GPS was used to position the helicopter, limiting absolute point elevation accuracy to no better than 30cm (combined GPS + IMU); * From 2008 onwards a dual-requency GPS was used to position the helicopter, enabling nadir point elevation accuracies in the sub-decimetre range.
- Hierarchy level
- Dataset
- Maintenance and update frequency
- As needed
- Maintenance note
- 2019-02-20 - record created by Glenn Hyland. 2019-03-06 - record updated by Glenn Hyland.
Metadata
- Metadata identifier
- string/RAPPLS_TotalFreeboard
- Language
- English
- Character encoding
- UTF8
Author
Sponsor
Owner
- Title
- Parent Metadata Record
- Citation identifier
- SIPEX_II_RAPPLS
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- b010f1e3-56b4-4cf1-a8f4-18746b9b4e29
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2019-03-06T09:40:08
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/RAPPLS_TotalFreeboard
Point of truth for the metadata record
- Date info (Creation)
- 2019-02-20T00:00:00
- Date info (Last Update)
- 2019-03-06
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile
Overviews
Spatial extent
Provided by
