The 1 Second DSM Version 1.0 is a gridded digital surface model representing the radar reflective surface (bare earth, vegetation and built structures) as observed by the Shuttle Radar Topographic Mission in February 2000. It was derived primarily from the 1 second SRTM version 2 provided by DIGO, supported by the Geodata 9 Second DEM in void areas and the SRTM surface water database. Stripes and voids have been removed from the 1 second SRTM data to provide an enhanced and complete digital surface model for Australia and near-shore islands. The grid spacing is 1 second in longitude and latitude (approximately 30 metres).

GA acts as a portal for all State geophysical datasets with the exception of South Australia. The data is located in the Geophysical Archive Data Delivery System (GADDS) and also mirrored on the externally located GA website. An internal link to the data is: \\Marl\export\jet\3\data (GA specific data is located here and State data is further segregated into folders). OEMD adds new survey datasets to GADDS as they become available. Each State Government requires a different license statement (refer to Licence Details). The height component of these surveys is acquired using radar altimetry. Errors inherent to this process are included in the attached .pdf document http://www.ga.gov.au/about/corporate/ga_authors/dem_errors.jsp#report or http://www.ga.gov.au/image_cache/GA2080.pdf

GEODATA 9 Second Digital Elevation Model (DEM-9S) Version 3 is a grid of ground level elevation points covering the whole of Australia with a grid spacing of 9 seconds in longitude and latitude (approximately 250 metres) in the GDA94 coordinate system. Version 3 was calculated by ANUDEM Version 5.2.2 elevation gridding procedure using comprehensively revised and augmented national GEODATA TOPO-250K Series 1, 2 and 3 from Geoscience Australia. The source data included revised versions of elevation points, streamlines, cliff lines and water bodies as well as trigonometric points from the National Geodetic Database and additional elevation and sink point data digitised by the Fenner School from 1:100 000 scale source material. ANUDEM Version 5.2.2 incorporates major upgrades to the modelling of streamlines, lakes, cliff lines and the coastline. GEODATA 9 Second Flow Direction Grid (D8-9S) has been released for the first time with Version 3. The D8-9S is a corresponding grid describing the principal directions of surface drainage across the whole of Australia. This grid was calculated by the ANUDEM procedure as it derived the DEM-9S. It incorporates the data streamline structure and describes the drainage structure continent-wide. It can be used to delineate streamlines and associated catchment boundaries for the DEM-9S. This is particularly useful in low relief areas where drainage structure is not reliably defined by the DEM-9S elevations alone. The product can be used for applications requiring accurate representation of absolute elevation values. The elevation of source data high points (hills or mountains) is well represented in Version 3. The 1:250 000 source scale of the elevation grid makes the product useful for national, State-wide and regional applications. For more detailed information please refer to the User Guide.

As part of the Urban Digital Elevation Modelling (UDEM) Project (July 2008- June 2010), Airborne LiDAR data were acquired in partnership with State jurisdictions over priority areas including Perth-Bunbury, Adelaide, Brisbane and the Gold Coast, Melbourne, Sydney and the NSW Hunter and Central Coast. These datasets were then further processed to produce hydrologically enforced and conditioned DEMs (Hydro-DEMs).

This metadata file and associated files contain metadata for the Geoscience Australia Kakadu LiDAR project carried out in 2011. This metadata is for the Digital Elevation Model created as 1m grid generated from the LiDAR point data classified as ground. The grid was generated employing a point to TIN and TIN to grid point process with nearest neighbour interpolation. The DEM was generated in ESRI ArcGIS V10 format.

The Murray Darling Basin Elevation Project (MDBEP) data covers the areas of the Murray Floodplain (Wakool and Edward Rivers) and Darling catchment areas (Balonne, Barwon, Bokhara, Boomi, Culgoa, Gwydir, Namoi, Macintyre, Macquarie, Mooni and Narran rivers).

RPS Group were awarded a contract by CO2CRC (Geoscience Australia) to carry out a Aerial LiDAR survey over the Nirranda South region of the Victorian Coast. The data will be used for the CO2CRC Otway project which will demonstrate that carbon capture and storage is a technically and environmentally safe way to reduce Australia's greenhouse gas emissions.

South East Queensand (SEQ) 2009 LiDAR data was funded by Queensland Department of Environment and Resource management (DERM) , which was captured and delivered by AAMHatch between March 25th 2009 and June 9th 2009. The project area covering 5300 sqkm was divided into three sub areas, namely South East Queensland Priority Area, Gold Coast and the Balance of SEQ. Data acquisition and post-processing has been controlled to achieve a vertical accuracy witihn 0.15m (RMS, 68% CI) and horizontal accuracy within 0.45 m. Horizontal coordinates are based upon Map Grid of Australia (MGA) Zone 56 projection. Vertical coordinates are referenced to Australian Height Datum (AHD). The data was captured with point density of 2.5 points per square metre and the data is available as mass point files (ASCII, LAS) and ESRI GRID files with 1m grid spacing in 1km tiles and inundation contours (0.25m). A hydrologically conditioned and drainage enforced 2m DEM or HDEM has also been developed in 2010 as part of the Urban DEM project managed by the CRC for Spatial Information and Geoscience Australia. The HDEM was produced by SKM using the ANUDEM program. Hydrologic enforcement and conditioning has included the testing of data for sinks, the referencing of transport and hydrology vector layers for intersections and flow, and the use of high-resolution imagery for visual validation. The methodology for hydrologic enforcement has required deriving a stream network based on flow direction and accumulation, using TIN and ANUDEM processes to analyse sinks and artificial damming affects caused by objects such as roads, bridges and trees which have not been previously filtered. Break lines have been included via the insertion of culvert/drainage channels, which has been used to interpolate these features into the main DEM as descending grid values. All data are referenced to GDA94/MGA Zone 56.

These datasets cover approximately 1230 sq km in the middle sector of the Southern Downs Regional Council and are part of the 2010 Southern Downs LiDAR capture project. This project, undertaken by AAM Pty Ltd on behalf of the Queensland Government captured highly accurate elevation data using LiDAR technology. Available dataset formats (in 1 kilometre tiles) are: - Classified las (LiDAR Data Exchange Format where strikes are classified as ground, non-ground or building) - 1 metre Digital Elevation Model (DEM) in ASCII xyz - 1 metre Digital Elevation Model (DEM) in ESRI ASCII grid - 0.25 metre contours in ESRI Shape

These datasets cover approximately 1990 sq km over the town of Bundaberg and the surrounding area in the Bundaberg Regional Council and are part of the 2011 Bundaberg LiDAR capture project. This project, undertaken by AAM Pty Limited on behalf of the Queensland Government captured highly accurate elevation data using LiDAR technology. Available dataset formats (in 1 kilometre tiles) are: - Classified las in ellipsoidal datum(LiDAR Data Exchange Format where strikes are classified as ground, non-ground, vegetation or building) - Classified las in AHD datum - 1 metre Digital Elevation Model (DEM) in ASCII xyz - 1 metre Digital Elevation Model (DEM) in ASCII grid - 1 metre Digital Elevation Model (DEM) in ESRI grid - 0.25 metre contours in ESRI Shape