This document describes a format of the AVNIR-2 (Advanced Bisible Near-Infrared Radiometer) products generaged by the ALOS Data Processing Subsystem.

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

The ANCA directory contains two scanned images, geology.tif and veg.tif. The geology map contains the following information: Base map compiled from topographic base sheets prepared by Australian Aerial Mapping Pty. Ltd. and supplied by The British Phosphate Commissioners. Geology and compilation by J. Barrie 1965-66 Drawn by J. Kopros Bureau of Mineral Resources, Geology and Geophysics CHRISTMAS ISLAND SURVEY 1965-66. To accompany Record 1967/37. The vegetation map contains the following message: Vegetation map - Accompanies Mitchells 1985 Report. ONLY COPY!! See File 80/13 for Report. It is based on J Barries geology map.

The Crazy Ants shapefile included in the CIGIS release was built from Parks Australia North Christmas Island (PANCI) working database file as at December 2001. This data contains observation data made by PANCI employees during their research of Crazy Ants colonies on 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

This dataset shows the approximate flight lines and centres of the aerial photography in relation to Christmas Island

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 seismic stacking velocity data in the Otway Basin are a useful dataset for calculating depths and sediment thicknesses. This work presents time-depth relationships computed from unsmoothed stacking velocities and compares these with functions obtained from sonobuoy refraction data and exploration well sonic logs. The comparison suggests that a total sediment thickness over-estimate for the Otway Basin of about 15% can be expected from the depths derived from stacking velocities alone. On the other hand, for sediment thickness calculations down to ~3 s two-way travel time below sea floor, stacking velocity data give comparable depths to those obtained from the sonic logs. A piece-wise formula is offered which scales the time-depth function for the Otway Basin in order to compensate for the depth overestimate inherent in using stacking velocities to calculate total sediment thickness.

Geoscience Australia conducted a survey to measure the benthic nutrient fluxes in Wallis Lake, during February 2003. The objectives were to: 1. measure the nutrient (and other metabolite) fluxes across the sediment-water interface at sites in Pipers Creek, Muddy Creek, Wallis Creek and in the Central Basin of Wallis Lake; 2. describe key processes controlling the nutrient fluxes across the sediment-water interface at each of the four sites; and 3. determine the trophic state and assess the estuarine condition of the four selected sites in Wallis Lake. The results of this recent summertime survey were compared to the observations made during the winter survey conducted in June, 2000. Pipers Creek and muddy Creek were similar in that they were both poorly flushed and close to nutrient discharges. These sites are at risk of experiencing eutrophic conditions. Wallis Creek had a high carbon loading, however the presence of seagrass and high denitrification efficiencies means this site remains in a 'good condition. Similarly, the Central Basin remains in a 'good' condition despite an increase in the carbon loading between winter and summer.