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.

Laser DEM Grids consists of 27 digital elevation model grids. The Arcview grid files were constructed from the Airborne Laser Scanning shapefiles. The Laser DEM grid tiles cover the eastern portion of the Christmas Island. Each grid contains the height in metres of the ground surface with a value every one metre on the ground.

This is a national seamless data product aimed at regional or national applications. TOPO 2.5M 1998 contains a small scale vector representation of the topographic mapping features of Australia. The data include the following themes: Hydrography - drainage networks including rivers, lakes and offshore features; and Infrastructure - roads, railways, localities and built-up areas. Data was primarily sourced from Geoscience Australia`s GEODATA TOPO-250K data set however all features were revised in 1998. Free online and CD-ROM (fee applies).

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

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

Contains the Australia Post Postcode boundaries, numbers and centroids plus postal facilities locations and sorting division boundaries for all Australia. Three levels of boundary detail are available from highly detailed to highly generalised as follows: - OPTIMAL - the as-digitised Postcode boundaries have been filtered to remove what are essentially coincident points. The Optimal Postcode boundary file is highly detailed, includes special boundary line attributes and is workstation ready. - UNIVERSAL - the Postcode boundaries have been filtered to make the resultant file suitable for use with most PC-based desktop mapping and GIS software. It is still geographically accurate. - MINIMAL - the Postcode boundaries have been heavily filtered. The Minimal Postcode boundary file represents only the approximate shape of the postcode area. This product was produced in conjunction with Australia Post.

Digital orthophotography was prepared from aerial photography flown on the 16th, 20th, and 21st of August 1987 and the 1st September 1987 by the Australian Survey Office (now Geoscience Australia) Canberra. AGSO commissioned BHP Engineering, Land Technologies Division to generate orthophotography from the 1987 aerial photography as a component of this Christmas Island GIS project that AGSO undertook on behalf of Territories Office. The orthophotography has a 30cm on-the-ground pixel size. The quality and resolution of the orthophotography is reasonable down to 1:500 scale. An orthophotograph is a computer image of an aerial photograph in which various distortions due to the landscape and camera lens have been removed. This data is based on the aerial photography of Christmas Island flown in August and September 1987. This has been converted to detailed colour orthophotography (at a 30cm ground resolution) presented as one hundred and fifty-seven 1km tiles for the whole of the Island. On most systems not all the orthophotography will be in this directory, due to limitations of disk size. Most orthophotography of disturbed areas (mining or township) is on the core CD-ROM.

Lord Howe Island is a small, mid-ocean volcanic and carbonate island in the southwestern Pacific Ocean. Skeletal carbonate eolianite and beach calcarenite on the island are divisible into two formations based on lithostratigraphy. The Searles Point Formation comprises eolianite units bounded by clay-rich paleosols. Pore-filling sparite and microsparite are the dominant cements in these eolianite units, and recrystallised grains are common. Outcrops exhibit karst features such as dolines, caves and subaerially exposed relict speleothems. The Neds Beach Formation overlies the Searles Point Formation and consists of dune and beach units bounded by weakly developed fossil soil horizons. These younger deposits are characterised by grain-contact and meniscus cements, with patchy pore-filling micrite and mirosparite. The calcarenite comprises several disparate successions that contain a record of up to 7 discrete phases of deposition. A chronology is constructed based on U/Th ages of speleothems and corals, TL ages of dune and paleosols, AMS 14C and amino acid racemization (AAR) dating of land snails and AAR whole-rock dating of eolianite. These data indicate dune units and paleosols of the Searles Point Formation were emplaced during oxygen isotope stage (OIS) 7 and earlier in the Middle Pleistocene. Beach units of the Neds Beach Formation were deposited during OIS 5e while dune units were deposited during two major phases, the first coeval with or shortly after the beach units, the second later during OIS 5 (e.g. OIS 5a) when the older dune and beach units were buried. Large-scale exposures and morphostratigraphical features indicate much of the carbonate was emplaced as transverse and climbing dunes, with the sediment source located seaward of and several metres below the present shoreline. The lateral extent and thickness of the eolianite deposits contrast markedly with the relatively small modern dunes.

Airborne Laser Scanning contains ESRI shapefiles constructed from ground height data points. The heights were obtained from an airborne laser scanning survey conducted by AAM Surveys Pty Ltd. The shapefiles contain surface heights in metres for the eastern half of Christmas Island.

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