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4. scul_mur

Description

Scullin and Murray Monoliths 1:25000 Topographic GIS Dataset.
Features include coastline, areas of exposed rock, melt lakes, spot heights and 100 metre interval contours.

Quality

The data were compiled in the Canberra office of the Australian Survey and Land Information Group (AUSLIG - now Geoscience Australia - GA) in July 1995. It was sourced from AAD aerial photography. A map in CAD format was produced at an approximate scale of 1:25000 (refer to a Related URL below). The CAD data were converted to GIS format.

The following information was provided by Noel Ward 4 July 2003. Noel worked with AUSLIG at the time the work was done. The data was plotted on a Wild BC2 using Film CASC4000, Run 3, Frames 78-80. These constitute two models. These models were controlled using two NatMap control points on the summits of each Monolith, NMS235 and NMS266. Common terrain points including some at sea level were selected in the model overlap area. The absolute orientation of each model was achieved by repeatedly observing common points in each model iteratively until the coordinate value derived from each converged (+/- 5-10m ?). Additional sea level terrain points were used to check that each model was levelled adequately. Given the method used to control the photography and taking into account the likely absolute accuracy of the control points, the absolute accuracy of these data cannot be quantified with certainty. The horizontal absolute accuracy is certainly not better than 10-20m. Similarly, the vertical accuracy is difficult to quantify but may be around the 5-10m level. From personal communications with Brian Murphy I understand that the MSL height associated with either Murray Monolith or Scullin Monolith was derived by parallax bar measurements on the above photography.

This data were translated and rotated to match the Landsat ETM image path 133 row 108, captured on 31 January 2000.

The data is usually mapped to a Universal Transverse Mercator projection, Zone 42.

Access

The topographic data are available for download in shapefile format. The CAD map from which the GIS data was extracted is also available for download. See the provided URLs.

Temporal Coverages

• Start date: 1995-01-01 - Stop date:

Spatial Coverages

Science Keywords

• EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > CONTOUR MAPS

Use Constraints

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=scul_mur when using these data.