1. Import the cover;
2. Join the xcode and acode tables (containing the relevant information about the features on the coverage) to the point/polygon and arc tables respectively;
3. Alter the tables as required;
4. Build the Arc/Info coverages (points, lines and annotation -- polygons do not build in any of the AUSLIG WA coverages);
5. Unsplit the line work (in larger datasets where appropriate -- to speed up drawing); and
6. Create a spacial index for display speed.

For all datasets, except annotation, shapefiles were created both for consistency and loading speed. Checks done by GA comparing shapefiles and coverages found that shapefiles were not significantly faster in drawing or calculation (and were in some cases slower), but were significantly quicker when loading. Since annotation does not convert to a shapefile, it was therefore left as an Arc coverage.  In September 2003 this dataset was converted to the MGA(GDA94) projection using an x y shift (550015 = x, 8780001 = y) on the CIG85 projection.

The dataset includes contours where the ground could be estimated using a stereo plotter. These contours do not have a height value attached as the source CAD file did not include this. However, Geoscience Australia has observed 1m contours in the urban and industrial areas and 2m contours elsewhere. The accuracy of these contour lines was confirmed by looking at the 1:1000 and 1:2000 AUSLIG 1987 maps.

The national park boundaries in this directory cover the whole of Christmas Island and are the best MREB could obtain. They originate from AUSLIG Perth as part of the 1987 cadastre data set and are accurate to 1:1000 scale. The cadastral data did not include internal boundaries of the park. Thus it was necessary for MREB to add the mining lease boundaries (supplied as part of the cadastral data) to the data national park boundaries to create the full national park boundaries.