Authors / CoAuthors
Wilson, N. | Tickle, P. | Inskeep, C. | Clive, A. | Green, K.
Abstract
Geoscience Australia (GA) was invited by Murray-Darling Basin Authority (MDBA) in 2010 to participate in an evaluation of the Intermap IFSAR (Interferometric Synthetic Aperture RADAR) data that was acquired as part of the Murray-Darling Basin Information Infrastructure Project Stage 1 (MDBIIP1) in 2009. This evaluation will feed into the business case for Stage 2 of the project. As part of the evaluation GA undertook the following: 1. A comparison of the IFSAR Digital Surface Model (DSM) and Digital Terrain Model (DTM) with a recent LiDAR acquisition, covering approximately 9000Km2 of the Lower Darling Region. It focused on assessment of the data over various land cover and terrain types and identified opportunities and issues with integrating IFSAR with LiDAR. 2. A comparison of the IFSAR Vegetation Canopy Surface (DSM minus DTM) with the Lower Darling LiDAR Canopy Elevation Model (CEM). 3. A comparison between currently mapped man-made and natural water bodies over the Murray-Darling Basin with the IFSAR derived products (water mask). 4. Application of the National Catchment Boundaries (NCBs) methodology to the IFSAR data and comparison with the delineated watersheds from PBS&J (Intermap's sub-contractor). This report outlines the findings of this evaluation based on the 4 items above MDBA requested.
Product Type
nonGeographicDataset
eCat Id
72795
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
Australia
Keywords
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- Report
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- DEM
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- topography
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- vegetation
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- water resources
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2011-01-01T00:00:00
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geoscientificInformation
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1
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Intermap flew 55,000Km2 of IFSAR data over the Murray-Darling Basin in 2009. Several surface products were used in this evaluation - the DSM and DTM created by Intermap and the water mask and watersheds created by PBS&J. Aerial imagery and orthorectified RADAR Images (ORI) were also used to look at the major differences between the LiDAR and IFSAR elevation models. AAM Hatch was engaged by GA to undertake a LiDAR survey as part of the Broken Hill Managed Aquifer Recharge (BHMAR) Phase 2 Project (Figure 3). The area of approximately 7856Km2 of the Lower Darling River, downstream from Wilcannia (and including the Menindee Lakes) was flown between 19 June 2009 and 5 August 2009. The reported accuracy of the survey was specified as ± 0.15m vertical accuracy (at 68% confidence interval), approximately ± 0.29m vertical accuracy at 95% confidence interval and ±0.25m horizontal accuracy (at 68% confidence interval). The DEM, Canopy Elevation Model (CEM), Foliage Canopy Model (FCM) and the raw LAS files were supplied for the BHMAR Project. For this evaluation, the DEM, FCM and CEM were used. The CEM was provided in 1Km tiles and IFSAR data did not provide a canopy surface so this was calculated using the DSM & DTM at 5m resolution. Further information on this LiDAR survey can be provided upon request.
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