Layer 08A Base of Evergreen and Marburg formations Surface produced for the Great Artesian Water Resource Assessment (GABWRA) by Geoscience Australia (http://www.ga.gov.au). This surface was created for 3D visualisation of the Base of Poolowanna Formation. The surface is available in the following formats 1. GOCAD surface (.ts) 2. ESRI grid 3. ASCII grid (.grd) Use limitations: 1. GOCAD surface requires program capable of reading GOCAD *.ts (triangulated surface) files 2. ASCII grid data requires re-interpolation by end-user resulting in minor differences to accompanying GOCAD *.ts surface. This layer is part of a set comprised of: Layer 01 3-second Digital Elevation Model surface (catalogue #75990) Layer 02 Base of Cenozoic surface (catalogue #75991) Layer 03 Base of Mackunda Formation and equivalents surface (catalogue #76021) Layer 04 Base of Rolling Downs Group surface (catalogue #76022) Layer 05 Base of Hooray Sandstone and equivalents surface (catalogue #76023) Layer 06 Base of Injune Creek Group surface (catalogue #76024) Layer 07 Base of Hutton Sandstone surface (catalogue #76025) Layer 05-07 Base of Algebuckina Sandstone surface (catalogue #76952) Layer 08A Base of Evergreen and Marburg formations (catalogue #76026) Layer 08B Base of Poolowanna Formation (catalogue #76953) Layer 09 Base of Precipice Sandstone and equivalents surface (catalogue #76027) Layer 10 Base of Jurassic-Cretaceous sequence surface (catalogue #76028) This dataset and associated metadata can be obtained from www.ga.gov.au, using catalogue number 76953.

The data covers an area of approximately 4600 sq km in the Namoi Valley, located around Narrabri, NSW. The LiDAR was captured in September and October 2013 with a point density of two points per square metre. The specified accuracies; 30cm vertical and 80cm horizontal, were achieved and verified through a rigorous network of check points and base stations. A set of seamless products were produced including hydro-flattened bare earth DEMs, DSMs, Canopy Height Models (CHM) and Foliage Cover Models (FCM). The outputs of the project are compliant with National ICSM LiDAR Product Specifications and the NEDF. The survey was conducted over two areas along the Namoi River: one from Boggabri to Narrabri, and the other between Wee Waa and Walgett including a newer extension to this original area to the north east of Wee Waa.

Geoscience Australia has created a seamless national 1-second Digital Elevation Model with consistent resolution, elevation units, and projection, incorporating the best possible source data. Data sources include the 1-second Shuttle Radar Topography Mission (SRTM) data as a baseline, and higher resolution LiDAR-derived data where available. The SRTM and LiDAR platforms produce data with very different horizontal resolutions: 1-second (approximately 30-metres) and 1-metre respectively. The vertical resolution of the datasets varies from 5-metres to 15-centimetres. In order to combine these datasets the higher resolution LiDAR is resampled to the same horizontal resolution as the SRTM dataset. The two platforms use different sensors, and detect different features. Some of the above-ground features can be automatically removed from the SRTM dataset while nearly all are removed from the LiDAR dataset. This leads to a discontinuity between the datasets that must be handled when mosaicking the two datasets together. There are several standard mosaic methods available, but none of them work suitably when combining these datasets. The elevation difference between these datasets has been overcome by using a distance-weighted mean mosaic method. This method applies a mean mosaic method that favours one dataset over the other depending on how far the seam line between the datasets is: if a point is near the edge of the LiDAR dataset, then the elevation is more similar to the SRTM dataset, and vice versa. This mosaic method has been applied to all of GA's LiDAR data holdings to create a new 1-second DEM covering all of Australia.

Moreton Bay 2009 LiDAR data was captured over the Moreton Bay Regional Council area between March and June 2009. The data was acquired by AAM Hatch (now AAMGroup) and funded by Queensland and Commonwealth governments. The project area covering 2440sqkm is licenced for use by all Commonwealth, State and Local Government organisations. 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.

Redland 2009 LiDAR survey was captured over the Redland City Council region between 25th March and 9th June 2009. The data was acquired by AAM Hatch (now AAMGroup) and funded by Queensland and Commonwealth governments. The data is licensed for use by all Commonwealth, State and Local Government. Data acquisition and post-processing has been controlled to achieve a vertical accuracy within 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. The data are available as a number of surface types, products and formats including: mass points, digital elevation model (DEM) and hydrologically enforced DEM (HDEM) for the low lying coastal areas. Redland DEM forms part of the Brisbane HDEM which is a combination of the Brisbane 2009 LiDAR, Redland 2009 LiDAR, Moreton Bay 2009 LiDAR and Logan 2009 LiDAR survey areas.

These datasets cover approximately 1400 sq km in the northern sector of the Lockyer Valley Regional Council and comprise the 2010 Lockyer Valley 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

Presented here is a method to create a 1-second Seamless Coastal Digital Elevation Model (SCDEM) from 1-meter resolution LiDAR-derived DEMs The process is used to make three surfaces using three statistics: -Mean - provides elevation for each cell -Range - an absolute indication of roughness or terrain variability for each cell -Standard Deviation - a normalised indication of roughness or terrain variability for each cell The Seamless Coastal DEM creation process can be broken into several phases: 1.Calculation of summary statistics and creation of DEMs for each survey area at the desired resolution (projected coordinate system) 2.Resampling all DEMs to 1-second (geographic coordinate system) 3.Identifying the area of least difference (seamline) using a delta-surface of overlapping survey areas 4.Re-shaping survey outlines along seamlines 5.Clipping summary statistic DEMs along re-shaped survey outlines 6.Mosaicking all surveys together into a seamless DEM The SCDEM creation process has been largely automated; scripts have been created to accomplish steps 1, 5 and 6 (which are the most time-intensive steps). Steps 2, 3, and 4 are conducted manually for each area where overlapping surveys exist. The SCDEM has been tested against the control points provided with the original LiDAR surveys, and it has been found to have a lower RMSE [2.02m] than any existing 1-second elevation datasets: the Shuttle Radar Topography Mission (SRTM) DEM [2.78m] and the smoothed version of the SRTM DEM [2.61m].

This project consists of data that has been reprocessed by RPS and AAM for the purpose of creating an improved Victorian coastal DEM including contours based on the original data acquired in 2007. The purpose of this project is to reclassify the original level 2 classification LiDAR data into level 3 for input to a higher accuracy ICSM Level 3 classification (Level 3 DEM). LiDAR (Light Detection and Ranging) is an airborne remote sensing technique for rapid collection of terrain data. The sensor used for this LiDAR project collected XYZ and Intensity data for first and last return by bouncing a pulse from the aircraft to the surface that enables the height and intensity values to be calculated. From the raw LiDAR data, a suite of elevation products was generated including DEM and Contours. Project Products: DEM, Contours, raw LiDAR.

Melbourne Geelong LiDAR 2007

These datasets cover approximately 1100 sq km in the central sector of the Hinchinbrook Shire Council and over all of Orpheus Island and are part of the 2009 Tropical Coast LiDAR capture project. This project, undertaken by Fugro Spatial Solutions Pty Ltd on behalf of the Queensland Government captured highly accurate elevation data using LiDAR technology. Available dataset formats (in 2 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