AAM Hatch was engaged by Geoscience Australia to undertake a LiDAR survey over the BHMAR Phase 2 prject area, for the purpose of producing a DTM and vegetation structure analysis. The survey covers an area of approximately 7856 sqkm of the Lower Darling River, downstream from Wilcannia. LiDAR was acquired from a fixed wing aircraft between 19 June 2009 and 5 August 2009 with a vertical accuracy of 0.15m and horizontal accuracy of 0.25m in coordinated system GDA 94, MGA Zone 54 and vertical datum of AHD. File formats included las format and 1m DTM ESRI Grids in ArcGIS binary grid format. Producing a DTM and vegetation structure analysis for the BHMAR Phase 2 Project area for groundwater monitoring.

The 3 second (~90m) Smoothed Digital Elevation Model (DEM-S) Version 1.0 was derived from resampling the 1 second SRTM derived DEM-S (gridded smoothed digital elevation model; ANZCW0703014016). The DEM represents ground surface topography, excluding vegetation features, and has been smoothed to reduce noise and improve the representation of surface shape. The DEM-S was derived from the 1 second Digital Surface Model (DSM; ANZCW0703013336) and the Digital Elevation Model Version 1.0 (DEM; ANZCW0703013355) by an adaptive smoothing process that applies more smoothing in flatter areas than hilly areas, and more smoothing in noisier areas than in less noisy areas. This DEM-S supports calculation of local terrain shape attributes such as slope, aspect and curvatures that could not be reliably derived from the unsmoothed 1 second DEM because of noise. A full description of the methods is in progress (Gallant et al., in prep) and in the 1 second User Guide. The 3 second DEM was produced for use by government and the public under Creative Commons attribution. The 1 second DSM and DEM that forms the basis of the product are also available as 3 second products (DSM; ANZCW0703014216, DEM; ANZCW0703014182, DEM-S; ANZCW0703014217). <strong>Please note that all 1 second products are available for GOVERNMENT USERS ONLY.</strong>

10m contours were generated for the whole of Christmas Island from the August 2011 LiDAR digital elevation model.

The CHM grid covers the whole of the Christmas Island. It was provided by AAM in 1km by 1km tiles which were then joined together into a single tif file using ESRI ArcMap. Each grid cell (2m x 2m) contains the maximum vegetation height in metres derived from the 2011 LiDAR aerial survey data.

This Digital Elevation Model Image is a subset from the GLOBE Project (1km) . The data is stored at /d/geo/store/data/national_data/dem/1kilometre and dataset(s) in this directory include: dem1k (LAMBERT projected image), dem1kdd (GEODETIC projected image), dem1kg (LAMBERT projected image - greyscale) and dem1kddg (GEODETIC projected image - greyscale. Note that Jpeg representations are also stored with each image for a quick view. Images can be viewed using ERMapper, ERViewer and ARCGIS (with the cew plug-in, available free from www.ermapper.com ). Full GLOBE metadata is stored in GEOMET. For additional information contact Bruce Kilgour.

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

Metadata acquired by GA for the purposes of the National DEM Project from WA Landgate. DEMs are a mass of ground heights representing a terrain surface. In this instance they are spaced at a regular grid interval. This dataset has been developed from aerial photography to assist in the digital imagery Orthorectification program. The status of coverage or other information relative to specific DEM data may be obtained directly through the DOLA contact.

Metadata acquired by GA for the purposes of the National DEM Project from WA Landgate. DEMs are a mass of ground heights representing a terrain surface. In this instance they are spaced at a regular grid interval. This dataset has been developed from aerial photography to assist in the digital imagery Orthorectification program. The status of coverage or other information relative to specific DEM data may be obtained directly through the DOLA contact.

Metadata acquired by GA for the purposes of the National DEM Project from WA Landgate. DEMs are a mass of ground heights representing a terrain surface. In this instance they are spaced at a regular grid interval. This dataset has been developed from aerial photography to assist in the digital imagery Orthorectification program. The status of coverage or other information relative to specific DEM data may be obtained directly through the DOLA contact.

Metadata acquired by GA for the purposes of the National DEM Project from WA Landgate. DEMs are a mass of ground heights representing a terrain surface. In this instance they are spaced at a regular grid interval. This dataset has been developed from aerial photography to assist in the digital imagery Orthorectification program. The status of coverage or other information relative to specific DEM data may be obtained directly through the DOLA contact.