The Continuous Seamless 10m DEM is derived from the Updated High Resolution 2.5m VCDEM as well as parts of the SRTM 1 second
DEM data and the Australian Bathymetry and Topography grid with all gaps interpolated smoothly to create a comprehensive
gap free DEM for the Victorian Coastal Region.
Positional Accuracy: The final product is derived from various data sources - from DELWP, Port of Melbourne, Deakin University,
CRCSI, Royal Australian Navy, and Geoscience Australia.
The 2010 VCDEM product consisted of a 1m Topography DEM and 2.5m Bathymetry product that covered 90% of the Updated High
Resolution DEM. The 1m Topography DEM is stated to have a horizontal accuracy of ± 35cm and a vertical accuracy of ± 10cm
@ 68% confidence interval. The 2.5m Bathymetry DEM accuracy meets the International Hydrographic Organization (IHO) Order
1 specifications of ± 50cm vertical and ± 3.17m horizontal accuracy @ 2σ.
The multibeam data obtained from Deakin University was acquired using a Kongsberg EM 2040 MBES with a capability of achieving
IHO Order of Special for hydrographic standard. The final accuracy of the data acquired exceeded that required for Order
1b of the IHO S-44 standard for hydrographic surveys.
MBES and LiDAR data obtained from Port of Melbourne was acquired using systems designed to meet IHO Order 1 for horizontal
and vertical accuracy.
Reprojection, aggregation, resampling and slight re-alignment of datasets will have had a negative impact on the final accuracy.
Datums are as follows:
Vertical Datum: AHD71 (EPSG:5711)
Horizontal Datum GDA94 - Projection: VicGrid 94 (EPSG:3111)