Data

Amery Ice Shelf velocity time series from Landsat images

Australian Antarctic Data Centre
YOUNG, NEAL W
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/595ad4757f0f6&rft.title=Amery Ice Shelf velocity time series from Landsat images&rft.identifier=10.4225/15/595ad4757f0f6&rft.publisher=Australian Antarctic Data Centre&rft.description=A time series of ice velocity values have been derived by analysis of LandSat-7 ETM+ images for the Lambert Glacier and Amery Ice Shelf system. The analysis technique uses feature tracking in pairs of Landsat-7 ETM+ images. This process uses surface features that persist with time and move with the ice as tracers of the ice motion. The displacement of these features over the time interval between acquisition of the two images in a pair is determined by image correlation. The analysis is made at regular increments across and along the images, to produce a regular grid of values. The derived values are filtered and validated according to set of a prior constraints for the flow in a local region and the statistics of a set of velocity values within a window. The images have been projected onto a common reference system, and spliced together in order to produce a seamless set of velocity values. Horizontal components of strain rate are derived from the velocity data using a set of derivative operators in a least-squares solution of an over-constrained set of equations, which uses all velocity values within a computation window. This procedure effectively produces a set of average velocity and strain rate values and accounts for much of the noise in the individual velocity observations. Values of the local longitudinal, transverse and shear strain rate components are derived by rotation of the cartesian values to the local flow direction. The procedure is described in Young and Hyland (2002). This metadata record has been derived from work performed under the auspices of ASAC project 3067 (ASAC_3067).&rft.creator=YOUNG, NEAL W &rft.date=2008&rft.coverage=northlimit=-73; southlimit=-75; westlimit=62; eastLimit=70; projection=WGS84&rft.coverage=northlimit=-73; southlimit=-75; westlimit=62; eastLimit=70; projection=WGS84&rft_rights=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=AAD_Ant_AIS_vel_series when using these data.&rft_subject=environment&rft_subject=geoscientificInformation&rft_subject=GLACIERS/ICE SHEETS&rft_subject=EARTH SCIENCE&rft_subject=CRYOSPHERE&rft_subject=GLACIER MOTION/ICE SHEET MOTION&rft_subject=Amery Ice Shelf&rft_subject=Lambert Glacier&rft_subject=Ice Velocity&rft_subject=Landsat 7&rft_subject=ETM+ > Enhanced Thematic Mapper Plus&rft_subject=TM > Thematic Mapper&rft_subject=LANDSAT&rft_subject=LANDSAT-7&rft_subject=SATELLITES&rft_subject=CONTINENT > ANTARCTICA&rft_subject=GEOGRAPHIC REGION > POLAR&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data
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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=AAD_Ant_AIS_vel_series when using these data.

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Brief description

A time series of ice velocity values have been derived by analysis of LandSat-7 ETM+ images for the Lambert Glacier and Amery Ice Shelf system. The analysis technique uses feature tracking in pairs of Landsat-7 ETM+ images. This process uses surface features that persist with time and move with the ice as tracers of the ice motion. The displacement of these features over the time interval between acquisition of the two images in a pair is determined by image correlation. The analysis is made at regular increments across and along the images, to produce a regular grid of values. The derived values are filtered and validated according to set of a prior constraints for the flow in a local region and the statistics of a set of velocity values within a window. The images have been projected onto a common reference system, and spliced together in order to produce a seamless set of velocity values. Horizontal components of strain rate are derived from the velocity data using a set of derivative operators in a least-squares solution of an over-constrained set of equations, which uses all velocity values within a computation window. This procedure effectively produces a set of average velocity and strain rate values and accounts for much of the noise in the individual velocity observations. Values of the local longitudinal, transverse and shear strain rate components are derived by rotation of the cartesian values to the local flow direction. The procedure is described in Young and Hyland (2002). This metadata record has been derived from work performed under the auspices of ASAC project 3067 (ASAC_3067).

Issued: 2008-07-20

Data time period: 1999-01-01 to 2006-12-31

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70,-73 70,-75 62,-75 62,-73 70,-73

66,-74

text: northlimit=-73; southlimit=-75; westlimit=62; eastLimit=70; projection=WGS84

Subjects
Amery Ice Shelf | CONTINENT > ANTARCTICA | CRYOSPHERE | EARTH SCIENCE | ETM+ > Enhanced Thematic Mapper Plus | GEOGRAPHIC REGION > POLAR | GLACIER MOTION/ICE SHEET MOTION | GLACIERS/ICE SHEETS | Ice Velocity | LANDSAT | LANDSAT-7 | Lambert Glacier | Landsat 7 | SATELLITES | TM > Thematic Mapper | environment | geoscientificInformation |

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AU-ANL:PEAU : http://nla.gov.au/nla.party-617536

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