Contacts

Identifiers and Keywords

ANZLIC Id

ANZVI0008103448 

Topic category

• Elevation

Resource Constraints

Use limitation

General 

Classification

Unclassified  

Other Dataset Details

Format

ESRI Ascii 

Spatial

Spatial representation type

Grid  

Reference system identifier

MGA Zone 54 GDA2020

Resolution

Horizontal Accuracy

0.3m  

Vertical Accuracy

0.2m  

Row Resolution

1cm  

Column Resolution

1cm  

Quality

Conceptual Consistency

DTM is absent of excessive triangulation and data voids. In areas beyond the 200m buffer, the LiDAR ground class has not been edited beyond automatic classification and may contain minor surface errors. The DTM is considered accurate inside the River AOI, however outside the AOI, the surface may contain artefacts from uncorrected point cloud classification anomalies. 

Missing Data

Complete for river AOIs within the Mallee CMA 

Lineage

Description

The DTM was primarily generated from the point cloud class 2 (ground). Class 9 (water) was also used in the DTM in order to form a continuous surface across the river channel where DTM interpolation could not fill data voids caused by water. The decision to include water points in the DTM was based on the following: - Hydro flattening of the river channel was not undertaken. The hydro flattening would normally infill the river channel area with (flat) surface data, regardless of lidar returns from the water surface. However, without the hydro flattening process, large void spaces would be present in the river channel area if only ground points were used. - Hydro flattening was not undertaken because the process relies on the manual delineation of where the water line finishes and channel bank begins in the point cloud classification stage. For the purposes of the project, it was important for this delineation to be undertaken using the Frontier-SI River Line Toolkit. - Although void areas could have solely been filled in by a TIN interpolation process, the preference was to utilise all available LiDAR returns from the channel area (ie; points classified as water) and then rely on TIN interpolation where no LiDAR points were available. ArcGIS 9.2 Terrain Grids were derived using las2dem. This tool reads LIDAR points from the LAS/LAZ format (or some ASCII formats), triangulates them temporarily into a TIN, and then rasters the TIN onto a DTM. 

Acquisition Date

Begin date

2019-02-11 

End date

2019-02-14 

Instrument

Name

Optech Galaxy 

Type

LIDAR 

Platform Type

Aerial 

Acquisition Data (Common)

Status

complete  

Assembly

Mosaic  

Tile Size

1 km  

Raster Details

Number of Bands

1 

Band List

1  

Resampling Kernel

Nearest Neighbour  

Platform Name

Fixed Wing Aircraft  

Seamlessness

Full  

Rectification Type

Not Entered  

DEM Details

DEM Creator

Supplier  

Aerial Survey Details

Runs

78 

Run Orientation

Various  

Side Overlap

30 

Forward Overlap

60 

Flying Height Unit

agl metre  

Flight Height

1200 

About the Metadata Record

Metadata identifier

92dc4309-92c8-55d1-b890-4e51a124adb1

Resource Type

Dataset  

Date info ( Revision )

2023-03-22T00:22:23

Standard Name

ISO 19115-3:2018 

Profile Name

DELWP Profile 

Profile Version

Version 1 

Profile Date

2019-05-24  

Metadata Constraints

Classification

Unclassified