Authors / CoAuthors
Sullivan, J.
Abstract
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.
Product Type
nonGeographicDataset
eCat Id
81898
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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- GA PublicationRecord
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2014-01-01T00:00:00
Creation Date
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Purpose
Maintenance Information
asNeeded
Topic Category
elevation
Series Information
Lineage
Unknown
Parent Information
Extents
Reference System
Spatial Resolution
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