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  • The Gold Coast hydrologically enforced digital elevation model (DEM) was created from a combination of the following surveys; Redland 2009 LiDAR, Gold Coast 2009 LiDAR and Logan 2009 LiDAR survey areas. The data is licensed for use by all Commonwealth, State and Local Government. Data acquisition and post-processing for all of the input surveys has been controlled to achieve a fundamental vertical accuracy of <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 hydrologically conditioned and drainage enforced 2m DEM or HDEM was 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. The HDEM ensures that primary stream/channel flow, and water flow across the land surface are accurately represented. The hydrologically enforced elevation model should be used for hydrological modelling.

  • City Yarra LiDAR 2007

  • This summary relates to a suite of LiDAR products for the NSW Central and Hunter Coasts. The data was collected by Fugro Spatial Solutions Pty. Ltd. Under contract to the NSW State Government in January 2007. The survey was funded by the NSW Greenhouse Office (The Cabinet Office) with contributions from the Hunter Water Corporation and Lake Macquarie Council. The source data are available as mass points (ASCII, LAS) and Gridded 1m and 10m DEMs in 1km tiles. There are 1429 tiles covering the survey area. 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. The HDEM ensures that primary stream/channel flow, and water flow across the land surface are accurately represented. The hydrologically enforced HDEM depicts water bodies as being flat, and water courses depict consistent downward flow of water unimpeded by vegetation or man-made structures such as bridges and major culverts. For the purposes of inundation modelling inundation contours have been developed using the HDEM. The inundation extents were extracted at 0.2m intervals below 2m AHD and 1m intervals up to 10m. The inundation contours are available as polylines. The inundation contours have also been flagged as to whether the area connects directly to the sea. All data are referenced to GDA94/MGA Zone 56 and AHD. A survey report documenting LiDAR performance was prepared by the contractor Fugro Spatial Solutions Pty Ltd.

  • These datasets cover approximately 400 sq km in the central, northern and eastern sectors of the Townsville City Council 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

  • This job is part of the town capture program

  • AAMHatch acquired Airborne Laser Scanning (ALS) data for the Sydney Metropolitan area between 11 June 2007 & 7 July 2007 and again in February to June 2008. The source data are available as mass points (ASCII XYZ, LAS) and Gridded 2m and 10m DEM tiles or 2m Mosaic. The vertical accuracy is 0.15m at 1 sigma in open clear ground as specified in the project scope. A hydrologically conditioned and drainage enforced 2m DEM or HDEM has also been developed by SKM in both MGA Zone 56 and in GCA GDA94 projection in ESRI GRID format. 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 and AHD using independent survey control which means the project area is not seamless and height difference between the 2007 and

  • Victoria Coast 2007-2008

  • 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.