Contacts

Identifiers and Keywords

ANZLIC Id

ANZVI0008103660 

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 55 GDA94

Resolution

Horizontal Accuracy

0.4m  

Vertical Accuracy

0.2m  

Row Resolution

1cm  

Column Resolution

1cm  

Quality

Conceptual Consistency

The data adheres to the logical rules of data structure, attribution and relationships as per project specifications. 

Missing Data

Dataset is complete for the defined project extent. 

Lineage

Description

A difference analysis was carried out over the entirety of the dataset in comparison to a series of historical DTM datasets covering the same area (summarily described as 2009 Melbourne DTM data). Difference rasters were calculated on an Old Minus New methodology in order to calculate summary statistics. This means that when viewing the difference raster, a negative value represents a cell which appeared higher in the 2018 dataset than the 2009 data, and a positive value represents a cell which appeared lower in the 2018 dataset than the 2009 data. Analysis was done on a per 1km x 1km tile basis, meaning that on average each tile summarises the values of approximately 1,000,000 individual DTM values, each of which is the averaged value of approximately 8 LiDAR measurements, meaning these summary statistics are a broad measure only. For more accurate assessments of the absolute accuracy of each individual section of the dataset, comparison checks have been carried out throughout the QA4LiDAR process and should be used for an accurate assessment on a per site basis. Having said this, the difference analysis is a useful tool for the assessment of the overall difference of the dataset in comparison to previously collected data. 

Acquisition Date

Begin date

2017-11-28 

End date

2018-10-27 

Instrument

Name

Trimble AX60 

Type

LIDAR 

Platform Type

Aerial 

Acquisition Data (Common)

Status

complete  

Assembly

Mosaic  

Tile Size

1 km  

Cloud Cover Percentage

0 

Raster Details

Number of Bands

1 

Band List

1  

Resampling Kernel

Nearest Neighbour  

Platform Name

Fixed Wing Aircraft  

Seamlessness

Full  

Rectification Type

Not Rectified  

Aerial Survey Details

Runs

4567 

Run Orientation

E-W and N-S  

Swath Width

520 

Side Overlap

30 

Flying Height Unit

agl metre  

Flight Height

450 

About the Metadata Record

Metadata identifier

c0d4fb08-1c2f-5252-ab80-046d987fa1ca

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