Authors / CoAuthors
Abstract
Adelaide LiDAR 2008 data was flown by AAMHatch between 13th to 19th September 2008 as part of the Urban Digital Elevation Modelling in High Priority Areas Project funded by the Federal Department of Climate Change. Several data gaps existed in the intital survey due to operational instrumentation errors and a subsequent refly was conducted on 5th January 2009 to complete the dataset. The data was captured with point density of 0.8m point per square metre and overall vertical accuracy has been confirmed at <15cm (68% confidence level). The data are available as mass point files (LAS) comprising ground, thinned ground and non ground points in 2km tiles. 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. 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. The hydrologically enforced elevation model should be used for any water modelling. Adelaide Hydrological Enforced DEM(HDEM) 2008
Product Type
dataset
eCat Id
70668
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- DEM topographic
- ( Theme )
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- DEM
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- AU-SA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Topology
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- Published_Internal
Publication Date
2008-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Special, MOU, etc.
Access - restricted
Use - license
Status
Purpose
Maintenance Information
notPlanned
Topic Category
elevation
Series Information
Lineage
Ground support: GPS base station data was provided by the Victorian Fovernment GPSnet Adelaide CORS station without incident. Ground data has been compared to 400 test points obtained by field survey and ssumend to be error-free. Test points were distributed in five groups across the mapping area and located on open clear ground. Comparison fo the field test points with elevations interpolated from measured data resulted in a mean difference of 0.2834m being removed from the data. Data processing: Reduction of the ALS data proceeded without any significant problems. Laser stikes were classigied into ground and non-ground points using a single algorith accross the project area. Manual checking and editing fo the data classidication further improved the quality of the terrain model. Data Presentation: The data provided has been supplied in accordance with a specification agreed with the primary client. The definition fo the ground under trees may be less accurate. HDEM Generation: 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. Drainage enforcement was limited to watercourse lines depicted on 1:25,000 topographic mapping and to the intersection of the water course layer and transport layer. Inundation Contours: 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. NEDF Metadata Acquisition Start Date: 13/09/2008 Acquisition End Date: 5/01/2009 Sensor: LiDAR Device Name: Leica ALS50-II (S/N: 091) Flying Height (AGL): UNK INS/IMU Used: - Number of Runs: UNK Number of Cross Runs: UNK Swath Width: UNK Flight Direction: - Swath (side) Overlap: UNK Horizontal Datum: GDA94 Vertical Datum: AHD71 - using local Geoid model Map Projection: MGA54 Description of Aerotriangulation Process Used: - Description of Rectification Process Used: - Spatial Accuracy Horizontal: 0.25 Spatial Accuracy Vertical: 0.15 Average Point Spacing (per/sqm): 0.8 Grid Resolution: 2 Laser Return Types: 1st and last Data Thinning: - Laser Footprint Size: 0.3 Surface Type: HDEM Product Type: GRID Distribution Format: ESRI GRID Calibration certification (Manufacturer/Cert. Company): AAM Hatch Pty Ltd Limitations of the Data: The definition of the ground under trees may be less accurate. Processing/Derivation Lineage: AAM Hatch Pty Ltd WMS: http://WIN-UDEM2:8399/arcgis/services/Adelaide_2009/MapServer/WMSServer?
Parent Information
Extents
[-35.0619, -34.7639, 138.4539, 138.773]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Adelaide Hydrological Enforced DEM(HDEM) 2008