Data

Amery Ice Shelf Grounding Zone defined as interpreted slope break in MODIS images

Australian Antarctic Division
Young, N. ; YOUNG, NEAL W
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=http://data.aad.gov.au/metadata/aad_ais_gz_modis_slope_break&rft.title=Amery Ice Shelf Grounding Zone defined as interpreted slope break in MODIS images&rft.identifier=http://data.aad.gov.au/metadata/aad_ais_gz_modis_slope_break&rft.publisher=Australian Antarctic Data Centre&rft.description=Grounding Zone of the Amery Ice Shelf, East Antarctica defined by break of surface slope as determined through interpretation of MODIS images. It defines the landward edge of the grounding zone and therefore the maximum extent of the ice shelf.The MODIS data from the 250 m Channel 2 were processed to a reflectance product and remapped to a Polar Stereographic Projection. The image contrast was stretched so that subtle variations in reflectance could be perceived. The variation in reflectance was used as an indicator of variation in slope. The break of slope of the snow surface was picked interactively on an image display at a frequency sufficient to define the shape of the grounding zone margin. The series of points are provided as a Point shapefile file as well as a set of arcs connecting the points. The point positions are given in geographic coordinates.This work was completed as part of ASAC projects 2224 and 3067 (ASAC_2224, ASAC_3067).Progress Code: completedStatement: The position of the grounding zone was determined by visual inspection and manual digitisation of features in MODIS images that are interpreted as being the break of surface slope. Quality is lower for the south-west sector where the interpretation is less certain. The locations will delineate the probable maximum extent of the Amery Ice Shelf. In any case the line is expected to define the landward edge of the grounding zone. Data are stored unprojected.&rft.creator=Young, N. &rft.creator=YOUNG, NEAL W &rft.date=2009&rft.coverage=westlimit=66.3; southlimit=-73.3; eastlimit=74; northlimit=-68.4&rft.coverage=westlimit=66.3; southlimit=-73.3; eastlimit=74; northlimit=-68.4&rft_rights=These data are publicly available for download from the provided URL.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&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_ais_gz_modis_slope_break when using these data&rft_rights=This metadata record is publicly available.&rft_subject=geoscientificInformation&rft_subject=EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS&rft_subject=EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS&rft_subject=EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER TOPOGRAPHY/ICE SHEET TOPOGRAPHY&rft_subject=Amery Ice Shelf&rft_subject=grounding zone&rft_subject=image interpretation&rft_subject=margin&rft_subject=surface slope&rft_subject=MODIS > Moderate-Resolution Imaging Spectroradiometer&rft_subject=LANDSAT-7&rft_subject=TERRA > Earth Observing System, TERRA (AM-1)&rft_subject=AQUA > Earth Observing System, AQUA&rft_subject=AMD/AU&rft_subject=ACE/CRC&rft_subject=CEOS&rft_subject=AMD&rft_subject=CONTINENT > ANTARCTICA&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
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Attribution 4.0 International (CC BY 4.0)
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These data are publicly available for download from the provided URL.

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_ais_gz_modis_slope_break when using these data

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Grounding Zone of the Amery Ice Shelf, East Antarctica defined by break of surface slope as determined through interpretation of MODIS images. It defines the landward edge of the grounding zone and therefore the maximum extent of the ice shelf.

The MODIS data from the 250 m Channel 2 were processed to a reflectance product and remapped to a Polar Stereographic Projection. The image contrast was stretched so that subtle variations in reflectance could be perceived. The variation in reflectance was used as an indicator of variation in slope. The break of slope of the snow surface was picked interactively on an image display at a frequency sufficient to define the shape of the grounding zone margin. The series of points are provided as a Point shapefile file as well as a set of arcs connecting the points. The point positions are given in geographic coordinates.

This work was completed as part of ASAC projects 2224 and 3067 (ASAC_2224, ASAC_3067).

Lineage

Progress Code: completed
Statement: The position of the grounding zone was determined by visual inspection and manual digitisation of features in MODIS images that are interpreted as being the break of surface slope. Quality is lower for the south-west sector where the interpretation is less certain. The locations will delineate the probable maximum extent of the Amery Ice Shelf. In any case the line is expected to define the landward edge of the grounding zone. Data are stored unprojected.

Data time period: 2003-11-02 to 2003-11-02

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Related Organisations

74,-68.4 74,-73.3 66.3,-73.3 66.3,-68.4 74,-68.4

70.15,-70.85

text: westlimit=66.3; southlimit=-73.3; eastlimit=74; northlimit=-68.4

Subjects
ACE/CRC | AMD | AMD/AU | AQUA > Earth Observing System, AQUA | Amery Ice Shelf | CEOS | CONTINENT > ANTARCTICA | EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS | EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER TOPOGRAPHY/ICE SHEET TOPOGRAPHY | EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS | GEOGRAPHIC REGION > POLAR | LANDSAT-7 | MODIS > Moderate-Resolution Imaging Spectroradiometer | TERRA > Earth Observing System, TERRA (AM-1) | geoscientificInformation | grounding zone | image interpretation | margin | surface slope |

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Other Information
Download point for the shapefiles. (GET DATA > DIRECT DOWNLOAD)

uri : https://data.aad.gov.au/eds/2191/download

Public information for ASAC project 2224 (PROJECT HOME PAGE)

uri : https://projects.aad.gov.au/search_projects_results.cfm?project_no=2224

Public information for ASAC project 3067 (PROJECT HOME PAGE)

uri : https://projects.aad.gov.au/search_projects_results.cfm?project_no=3067

Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)

uri : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=aad_ais_gz_modis_slope_break

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