The datum of this dataset is as described in GIS dataset AAT_Coastline_Landsat7. The Landsat 7 image (2002-01-30 Path 126 Row 109) georeferencing was checked using Ground Control Points derived from a survey report prepared by Hydro Tasmania for the Mapping Officer of the AAD, summer 2000/2001. The Ground Control Point locations were found to be within the image pixel resolution. The georeferencing of the image could not be improved on. Therefore no transformation, scaling or rotation was applied to the Landsat 7 image.
gis136 (Larsemann Hills - mapping from Landsat 7 data captured January 2000) data were merged with the newly mapped Larsemann Hills aerial photogrammetric plotting dataset gis135.
A report on the project is available at the url given below.
This dataset includes topographic information digitised by Geoscience Australia from Landsat 7 satellite imagery captured on 2000-01-30 Path 126 Row 109 (Qinfo = 489) and topographic information copied from the Larsemann Hills 1:25000 Topographic GIS Dataset (Qinfo = 509).
The Landsat 7 image was supplied to the AAD by Geoscience Australia, AMBIS Group.
Quote from ... metadata record AAT_Coastline_Landsat7: &The Landsat 7 images were supplied with systematic correction determined by satellite ephemeris data, which is a satellite model based on information about spacecraft position and attitude. This information is transmitted with the imagery, or provided by the satellite operator at the time of image acquisition. It allows the imagery to be located to a limited absolute accuracy (i.e. its position on the Earth). Landsat 7 ETM+ imagery was compared with various geodetic control points whose accuracy is estimated at being less than 1m. A visual estimation of their positional accuracy against Landsat 7 ETM+ showed an average accuracy of approximately 150m or less.&
The specifications for gis135 (Larsemann Hills mapping from aerial photography flown on 1998-02-01) stated that the data derived from the Landsat 7 image and the Larsemann Hills 1:25000 Topographic GIS Dataset was to be compared with gis135 and the necessary transformation made, if required. On comparison, the two topographic data sets compared very closely - within metres and no block shift or rotation was obvious. The gis135 data were also checked against the Landsat 7 image and matched the image. The gis136 data were also checked against the newly mapped Larsemann Hills vector dataset (gis135) and was found to correlate, however the newly mapped data were found to contain far more detail.
No further transformation was applied to the image or topographic data.
This dataset was integrated with the newly mapped Larsemann Hills features (gis135). To integrate the data the extent of the new mapping was inserted into the layers of this datasets. All data within this extent was deleted and the remainder integrated into the newly mapped data. Nodes in the Coastline, Continent and Ice layers were moved to ensure correct snapping with the newly mapped data. Only the rock layer was edited. There were no contour data in gis136 to integrate with gis135.
The data are on WGS reference frame ITRF2000 at 2000 on the GRS80 ellipsoid and all GIS data processing was computed on UTM zone 43. The data was un-projected and delivered in geographical coordinates.
Stored data format: ArcView shapefiles Available format type: ArcView shapefiles. Stored as geographicals with a projection file. Access constraint: ArcView shapefiles are available on the web. Refer to the URLs below. Conditions apply.
A copy of the mapping report is available for download as pdf at the url given below.