Contacts

Identifiers and Keywords

ANZLIC Id

ANZVI0803005783 

Jurisdiction

Victoria 

Topic category

• Elevation
• Environment
• Geoscientific information

Resource Constraints

Classification

Unclassified  

Creative Commons Attribution 4.0 (CC-BY)

• 
• License Text

Other Dataset Details

Date ( Revision )

2021-08-31

Status

Completed  

Purpose

Slope and slope classes, Aspect Insolation, Drainage network, Hydrological indicies and water table indicies, Climate variables, Input to estimation of soil parameters, Input to land component and soil type mapping, Viewshed analysis, Visualisation, Environmental modelling including salinity, species distribution, spread models etc. 

Format

ASCII tiles 3 

Supplemental Information

Current Design Issues: A DEM with wide general use is required, that is, the DEM must ideally meet the needs of a wide range of users. This implies a need for the highest possible quality model. Hydrological soundness is maximised by using the ANUDEM software. Interpolation is to a 20m grid. For some derivations it may be necessary to interpolate the DEM to a finer resolution. Continuity with surrounding sheets is essential. Future Design Issues: The cell size may need to be reviewed. The procedures may need to be reviewed in flat, featureless terrain where contour data are sparse. Related Documents: None 

Maintenance and update frequency

Not planned  

Spatial

Spatial representation type

Grid  

Description

General - Victoria 

Reference system identifier

4283

N

S

E

W

Temporal

Begin date

2017-03-07 

End date

2017-07-14 

Resolution

Horizontal Accuracy

25m  

Quality

Conceptual Consistency

Visual and computational coverage checks ensured the input datasets were represented in the final product and heights still aligned with input data. 

Missing Data

Will be completed on a needs basis, however the DEM can be readily generated for any tile with topological TOPO25 data. Complete Victorian Coastline Completeness Verification: Complete 

Attribute Quality

Not Relevant 

Positional Accuracy

Precision: 20m grid resolution; otherwise determined by topographic base. Bias: determined by topographic base Determination: The DEM is fixed to the topographic base maps 

Lineage

Description

Preparation 1. Acquire high resolution data from Deakin University, PoM and DELWP 2. Analyse datasets for project suitability 3. Convert suitable datasets to raster format if provided in LAS or XYZ formats 4. Convert horizontal datums to GDA94 (if not already) 5. Convert heights to AHD (if not already) 6. Check the datasets fit vertically with the 2010 VCDEM by comparing the difference of any overlap between input datasets and the 2010 VCDEM 7. Determine order of highest quality/most recent to lowest quality/oldest datasets where overlap occurs 8. Clip (remove) any distinct triangulation from derived rasters Updated High Resolution DEM 1. Aggregate or resample (with a cubic operator) high resolution datasets to 2.5m resolution 2. Create a TIFF mosaic (with a first operator) from all high-resolution datasets and 2010 VCDEM on a VicGrid94 projection 3. Create MGA Zone54 and 55 section TIFFs by clipping and re-projecting the TIFF mosaic 4. Convert both MGA TIFFs and the VicGrid94 TIFFs to 5km ESRI ASCII grid tiles 

Statement

Dataset Source: Bathymetric data supplied by Deakin University, Port of Melbourne and the Royal Australian Navy combined with exiting DELWP DEM datasets including the 2010 VCDEM, the 2014 Western Port DEM and National Elevation Data from Geoscience Australia to successfully create this new product. Dataset Originality: Derived 

About the Metadata Record

Metadata identifier

urn:uuid / 57a89a54-8adc-5e88-b2cf-e0f45496b36f