Data

Gravity and Elevation Data Acquisition in the Casey Region

Australian Antarctic Data Centre
THOMAS, LINDSAY
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=info:doi10.4225/15/583bbca96e2fd&rft.title=Gravity and Elevation Data Acquisition in the Casey Region&rft.identifier=10.4225/15/583bbca96e2fd&rft.publisher=Australian Antarctic Data Centre&rft.description=A gravity survey was undertaken in the 93/94 ANARE season between Voyages 5 and 6 (early Dec - mid Jan). The survey area was the Windmill Islands, Antarctica based at Casey Station. 53 gravity stations were obtained, including BMR 6842.0004 which is part of the ISGN 71 system. The stations have been located by an AUSLIG (now Geoscience Australia) surveying team and the data will be forwarded when it is processed. Transport for the survey was provided on station and mainly utilised helicopters. The gravity data will be processed and used to produce a Bouguer Gravity map. This map will then be interpreted in association with available geological data. The download file contains a word document outlining the work completed, as well as several text documents of data. WINDIS is a copy of the projects report windg00 is a file of principal facts for the gravity stations Suzanne acquired WINDISGR.txt is a file of the field data, for the gravity reduction program WINDISGR_gmred.txt is the output file from that program The folder HYSLOP contains a letter from John Hyslop of Geoscience Australia, together with the files referred to in that letter. The coordinates in those files, if they differ from the coordinates in windg00, will be updated versions. The fields in this dataset are: latitude longitude easting northing elevation gobs free boug terr Descriptions of some of those fields are below: gobs - 'Observed Gravity' - 'Observed' gravity acceleration at the station (the result of standard manipulations of the raw gravimeter observations. free - 'Free Air Gravity' - gravity acceleration adjusted for the height of the station above the datum (usually the geoid), and also usually with 'normal' gravity (the value of gravity at the same lat and long on the geoid) subtracted. Then known as 'Free Air Gravity Anomaly'. Function of elevation only. boug - 'Bouguer Gravity' - Free Air anomaly further adjusted, approximately, for the mass of material between the station and the datum plane. This is the Bouguer Adjustment (often Bouguer Correction, but it is not a correction as there is nothing wrong with the data), and the value is known as the Bouguer Anomaly. The header should state the density of material assumed in the calculation, but if it is not stated it would be assumed to be 2.67 t.m3 . (Given elevation, free, and boug, density can be reverse-engineered trivially anyway.) terr - 'Terrain Anomaly' - Bouguer Anomaly corrected for difference between the Bouguer Plate assumption and actual topography. The Bouguer Adjustment assumes that mass between station and datum is represented by a parallel-sided, horizontal slab; the Terrain Correction attempts to take care of the difference between that model and the real terrain.&rft.creator=THOMAS, LINDSAY &rft.date=2000&rft.coverage=northlimit=-66.0; southlimit=-66.0; westlimit=110.0; eastLimit=110.0; projection=WGS84&rft.coverage=northlimit=-66.0; southlimit=-66.0; westlimit=110.0; eastLimit=110.0; 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=ASAC_724 when using these data.&rft_subject=geoscientificInformation&rft_subject=GRAVITY&rft_subject=EARTH SCIENCE&rft_subject=SOLID EARTH&rft_subject=GRAVITY/GRAVITATIONAL FIELD&rft_subject=METAMORPHIC ROCKS&rft_subject=ROCKS/MINERALS/CRYSTALS&rft_subject=ANTARCTICA&rft_subject=BOUG&rft_subject=CASEY&rft_subject=EASTING&rft_subject=ELEVATION&rft_subject=FREE&rft_subject=GEOLOGY&rft_subject=GOBS&rft_subject=ISGN 71&rft_subject=LATITUDE&rft_subject=LONGITUDE&rft_subject=NORTHING&rft_subject=TERR&rft_subject=WINDMILL ISLANDS&rft_subject=CONTINENT > ANTARCTICA > Windmill Islands&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=ASAC_724 when using these data.

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The data are available for download from the provided URL.

Brief description

A gravity survey was undertaken in the 93/94 ANARE season between Voyages 5 and 6 (early Dec - mid Jan). The survey area was the Windmill Islands, Antarctica based at Casey Station. 53 gravity stations were obtained, including BMR 6842.0004 which is part of the ISGN 71 system. The stations have been located by an AUSLIG (now Geoscience Australia) surveying team and the data will be forwarded when it is processed. Transport for the survey was provided on station and mainly utilised helicopters. The gravity data will be processed and used to produce a Bouguer Gravity map. This map will then be interpreted in association with available geological data.

The download file contains a word document outlining the work completed, as well as several text documents of data.

WINDIS is a copy of the projects report
windg00 is a file of principal facts for the gravity stations Suzanne acquired
WINDISGR.txt is a file of the field data, for the gravity reduction program
WINDISGR_gmred.txt is the output file from that program


The folder HYSLOP contains a letter from John Hyslop of Geoscience Australia, together with the files referred to in that letter. The coordinates in those files, if they differ from the coordinates in windg00, will be updated versions.

The fields in this dataset are:

latitude
longitude
easting
northing
elevation
gobs
free
boug
terr

Descriptions of some of those fields are below:
gobs - 'Observed Gravity' - 'Observed' gravity acceleration at the station (the result of standard manipulations of the raw gravimeter observations.

free - 'Free Air Gravity' - gravity acceleration adjusted for the height of the station above the datum (usually the geoid), and also usually with 'normal' gravity (the value of gravity at the same lat and long on the geoid) subtracted. Then known as 'Free Air Gravity Anomaly'. Function of elevation only.

boug - 'Bouguer Gravity' - Free Air anomaly further adjusted, approximately, for the mass of material between the station and the datum plane. This is the Bouguer Adjustment (often Bouguer Correction, but it is not a correction as there is nothing wrong with the data), and the value is known as the Bouguer Anomaly. The header should state the density of material assumed in the calculation, but if it is not stated it would be assumed to be 2.67 t.m3 . (Given elevation, free, and boug, density can be reverse-engineered trivially anyway.)

terr - 'Terrain Anomaly' - Bouguer Anomaly corrected for difference between the Bouguer Plate assumption and actual topography. The Bouguer Adjustment assumes that mass between station and datum is represented by a parallel-sided, horizontal slab; the Terrain Correction attempts to take care of the difference between that model and the real terrain.

Issued: 2000-08-04

Data time period: 1993-12-01 to 1994-01-20

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110,-66

110,-66

text: northlimit=-66.0; southlimit=-66.0; westlimit=110.0; eastLimit=110.0; projection=WGS84

Subjects
ANTARCTICA | BOUG | CASEY | CONTINENT > ANTARCTICA > Windmill Islands | EARTH SCIENCE | EASTING | ELEVATION | FREE | GEOGRAPHIC REGION > POLAR | GEOLOGY | GOBS | GRAVITY | GRAVITY/GRAVITATIONAL FIELD | ISGN 71 | LATITUDE | LONGITUDE | METAMORPHIC ROCKS | NORTHING | ROCKS/MINERALS/CRYSTALS | SOLID EARTH | TERR | WINDMILL ISLANDS | geoscientificInformation |

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

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