A useful spin off of the soft photogrammetry is the opportunity to get one metre contours over the disturbed areas of the Island. For the north-east area of the Island 2km X 2km DEM contour tiles have been trialed in the CIGIS. Most are at a contour interval of 5 metres but tiles 2269 and 2469 have been done at a one metre contour interval. The DEM contours are surface contours. They pick up the reflective surface beneath the aircraft. The reflective surface may be the ground or it may be a dense vegetation canopy or rooftops etc. Further one metre contour coverage can be prepared on a cost recovered basis.

Product no longer exists, please refer to GeoCat #30413 for the data

Product no longer exists, please refer to GeoCat #30413 for the data

The pinnacle field boundaries dataset covers the whole of Christmas Island. It contains polygons that have been digitised around areas or fields of pinnacles. The polygons were digitised in two goes. The first was a animated process initiated by Geoscience Australia using Erdas software, this resulted in high resolution polygons located over the north east portion of Christmas Island. This turned out to be a slow process so the task was then taken up by manual digitising off the screen using orthphotography as a back drop. This method was used in digitising the rest of the island. The lack resolution for these polygons can be seen by their blocky appearance, these are visible at scales of 1:10,000. The pinnacle boundaries shapefile is pinclbnd.shp and contains the following fields: Field Type Width Decimal ---------------------------------------------------Shape FIELD_SHAPEPOLY 8 0 Area FIELD_DECIMAL 12 3 Perimeter FIELD_DECIMAL 12 3 Altpinn_cn FIELD_DECIMAL 11 0 Altpinn_cn FIELD_DECIMAL 11 0 Single_tre FIELD_CHAR 16 0 Dxf_color FIELD_DECIMAL 2 0 Dxf_thickn FIELD_DECIMAL 12 3 Dxf_type FIELD_CHAR 10 0 Dxf_elevat FIELD_DECIMAL 12 3 Dxf_angle FIELD_DECIMAL 12 3 Dxf_size FIELD_DECIMAL 12 3 Dxf_text FIELD_CHAR 80 0 Dxf_attrib FIELD_CHAR 16 0 Dxf_iid FIELD_DECIMAL 11 0 Hectares FIELD_DECIMAL 16 3

After 1985, in preparation for rehabilitation of some previously mined areas, ANCA commissioned ground surveys of those areas. Three of these, Fields 20s and 22a, and Field 19a are included in the GIS. Fields 20s and 22a were provided in CIG85, while Field 19a, the most recently completed, is probably in Christmas Island Grid 1992 (CIG92).

Demtiles (a concatenation of DEM tiles) contains some samples of a representation of the Digital Elevation Model as TIFF images.

ACRES acquired SPOT 2 satellite images over the Namoi River, between the towns of Walgett and Wee Waa in December 1997 and November 2000. The November 2000 image consists of 12 scenes in which floodwaters, peaking at 8 metres, inundating the region are visible as green and light blue. Extensive flooding is evident. The December 1997 image shows the area of the Namoi River without floodwaters. The Namoi River catchment area is more than 350 kilometres long and stretches from Walcha in the east to Walgett in the west. Other river systems in the region include the Gwydir, Castlereagh, Hunter, Macquarie, Macleay, Manning, Culgoa and Condamine. You can find these rivers on Geoscience Australia's interactive Map of Australia.

H4 Quarterly Report Mar-Oct 2003

Exploration fundamentals related to predicted world economic growth and higher oil prices suggest a resurgence in exploration for oil and gas liquids in the Timor Sea in the next two years, despite a slow down in exploration drilling in the last 12 months.

The Valley Networks dataset covers the whole of Christmas Island. It contains low elevation lines that were constructed from the 25K Digital elevation map. The lines were obtained by running a series of ArcView grid commands using the Hydrologic Modeling v1.1 extention. The valley_net.shp contains the following fields: Field Type Precision Decimal---------------------------------------------------Shape FIELD_SHAPELINE 0 9Id FIELD_DECIMAL 0 11Gridcode FIELD_DECIMAL 0 10Length FIELD_DECIMAL 3 16