Abstract:
These data were collected during an AAD conservation expedition to Mawson's Huts, Cape Denison, Commonwealth Bay, Antarctica in 2002 (October to December). The expedition travelled to Commonwealth Bay on board the Astrolabe (French Antarctic supply ship). An expedition report was written, a large number of photographs were taken, and a large number of artefacts were catalogued. Several GIS shapefiles were created from these data. They are point, line and poygon data showing the location of the artefacts.
Quality
See the expedition report for further information. These data are related to two other metadata records - "Cape Denison Historic Site, Commonwealth Bay - GIS DataSet Digitised from Cape Denison Map [cden_gis]" and "Cape Denison Detail Survey, December 1985, GIS Dataset [cden_survey_gis]". Data for this metadata record were collected by Mike Staples and Estelle Lazer. Below are some notes ... recorded by Mike Staples: Instrument Operator: Mike Staples Data processed by Robert Walch (Walch Optics Hobart), Nick Bowden DPIWE Hobart. Instrument: Leica TCR 703 3 second angular accuracy, 2mm EDM accuracy. Coordinate system used matched Greg Crispo's 1985 work. (Wild T2 and DI1000) Most of Gregs 1985 marks were found and several were re-measured and confirmed. Two new marks were created and permanently marked with aluminium tags AUS2000 and AUS2001. All artefact data were collected from these points and Beryl Hill Survey mark. All raw data were coordinated onto Crispo's grid. Crispo was contacted and he indicated that the orientation of his coordinates were based on sun observations. Crispos orientation has been assumed correct as no better options were available. The block shift of raw data to UTM was by applying an Easting and Northing correction without adjusting the orientation. Based on coordinates for the transit block, the data were shifted from: Crispos 841.926E, 1117.089N and 7.877H (see AS4) To 572420.117E, 2566696.669N and 7.877H. (see AS5) These coordinates were from http://www.auslig.gov.au/geodesy/ngdb/antwgs84.txt WGS84 is coincident with ITRF2000 to an accuracy better than the transit block fix. Here the Transit block is called the Commonwealth Bay Survey Control Point, derived from JMR satellite doppler fix on 18/01/1978 by P Quinn. S67deg 00' 30.886" E142deg 59' 00". This block shift has proven to be accurate although there is possibly a small rotational error. This is insignificant for points close to the Transit Block, but may be significant if work was to be done kilometres from this point. The data were reduced using Liscad and handed to the AAD as AS5.asc, AS5DXF, AS5.SEE and Com Bay Survey Data.see. These three formats are ASCII, Autocad and Liscad respectively.
