Progress, Directions & Challenges
Presented at LiDAR Technologies 2011
May 30-31, Cairns, Australia
by: Nerida Wilson
(Phil Tickle & Chris Inskeep)
Geoscience Australia
42. More Information…. Contact: Nerida Wilson 02 6249 9254 Email: [email_address] NEDF-Portal: http:// nedf.ga.gov.au GA website: http://www.ga.gov.au/topographic-mapping/digital-elevation-data.html
Notes de l'éditeur
Data Needs for Australia Climate Change – Monitoring sea level rise over time, prioritiising land zoning, land use Water Resources – improving the Australian Hydrological Geospatial Fabric by including higher resolution data to resolve network anomalies. Environmental and Natural Resource Management – Developing higher resolution elevation databases to meet the needs of resource managers. The use of LiDAR data to understand bare earth models with Canopy models. Modeling fuel loads, forest biomass, ability to give advice of forest health. Communications and Transport – the use of elevation data to plan communications infrastructure (Mobile Phone Towers,and other). Use of elevation data to develop engine management systems for heavy transport (eg US transport savings of $40m) urban/industrial infrastructure development – the use of high resolution data for modeling proposed developments as a pre survey option Emergency Management –the use of elevation data along with other GIS data sets to model fire behaviour (expert systems in GIS)
9”, SRTM 3” , SRTM 1” cleaned, 25 m NSW, Lidar Main message here: 1 second SRTM captures shapes markedly better than 3 second, and in a lot of cases better than regional contour-based 20-30 m DEMs. Apart from the LIDAR, the 1” SRTM is the best of the bunch (or will be once the smart smoothing has been done) Option 2- is this better than the greyscale one. Check regional DEM res and is it 5m LiDAR or 1m? 9”, SRTM 3” , SRTM 1” cleaned, 25 m NSW, Lidar Main message here: 1 second SRTM captures shapes markedly better than 3 second, and in a lot of cases better than regional contour-based 20-30 m DEMs. Apart from the LIDAR, the 1” SRTM is the best of the bunch (or will be once the smart smoothing has been done)
Geodata 9 sec DEM – Developed by ANU over a 20 year period, is the base product for the development of the Australian Hydrological Geospatial fabric Free unrestricted national dataset. Regional DEM’s in a variety of resolutions developed by state organisations for specific purposes. Example: Victorian VicMap Elevation 5m DTM. Existing contours spot height hydro-network data for the development of 9 second DEM SRTM (Shuttle Radar Topographic Mission) 3 Second unrestricted National Dataset to be released under creative commons (Work still in progress), and 1 Second Government Restricted National Dataset (version 1.0 Released Dec 2009) ALOS (The Advanced Land Observing Satellite) and Spot HRS (High Resolution stereo imagery) Tandem-X (space borne radar remote sensing) Lidar (Light detection and Ranging) Traditional ground surveys Note: All data within the portal has value from the coarse 9 second Dem to the high resolution LiDAR the portal provides, it relates to the purpose the data is to be used for.
Governance structures that enhance coordination and cooperation across all levels of government and industry Mechanisms for funding which promote cost sharing, and coordination of data acquisitions which meet whole of government requirements. Technical standards which maximise the utility and interoperability of data Access, distribution and use arrangements which ensure information is discoverable, accessible and able to be used (without restriction) by government, industry and the community for improved decision making. Industry development and capacity building to help grow the ability of industry to meet the expanding needs of Australia in this area of technology. Enhancing access to information across all levels of government, industry, academia and the community Minimising duplication of effort Increasing the utility of data by developing and promoting flexible standards that meet the needs of users and providers and “future proof” our investment in data. Promoting industry development through the coordination of acquisition programs, adoption of standards, partnerships and development of appropriate licensing arrangements. Influencing the development of national and international capacity to mitigate and adapt to the impacts of climate change
Example of the better quality information from SRTM compared to best available information on catchment boundaries. 10 km shift in catchment boundary. Grey – 9 sec derived catchments (MDB derived catchment using 9 sec) Black – 1 sec derived catchments AWRC – derived from 9 sec DEM drainage divisions Profile – differences between heights of black and grey line.
Managed by the CRCSI under contract to the Department of Climate Change with significant project and technical support from GA and ANZLIC LiDAR and imagery valued at approximately $5 million has been acquired for ~$1 million in project funding with whole of government licensing. An additional ~$10 million of LiDAR has also been accessed under restricted Commonwealth licensing in VIC and WA.
Approximately 20,000sqkm of LiDAR has been acquired over Darwin, greater Perth, Adelaide, Melbourne, Sydney, NSW Hunter coast and South East Qld with Whole of Government Licensing.
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