Ballarat & Colac - LiDAR

dataset
Dataset: Ballarat & Colac - LiDAR Assembly: Single
 
Citation proposal Citation proposal

Ballarat & Colac - LiDAR

Department of Transport and Planning

Description

Title
Ballarat & Colac - LiDAR 
 
 

Temporal

Time period
2012-01-252012-02-14 
 
 

Spatial

Horizontal Accuracy
0.2m 
Vertical Accuracy
0.1m 
Code
MGA Zone 54 GDA94 
 
 

Format

Title
LAS 1.2 Classification Level 2 
 
 

Contacts

  Point of contact

  Custodian

 
 

Keywords

Topic category
  • Elevation
 
 

Resource Constraints

Use limitation
General 
Classification
Unclassified 
 
 

Lineage

Description
LiDAR was acquired over the project area and transformed into an ellipsoid (ITRF2005) point cloud using a solution from the onboard GPS and IMU supplemented by Victorian CORS basestations. The point cloud was then adjusted to AHD (AusGeoid09) and checked against a network of ground control points. Laser strikes where classified into ground and non-ground classes using a single algorithm across the entire project before further automatic classification was performed to differentiate between non ground features. Following this, manual checking and editing was undertaken to further improve the classification of the terrain model. 
 
 

Metadata Constraints Metadata Constraints

Classification
Unclassified 
 
 

Quality

Attribute Quality
Positional Accuracy
Conceptual Consistency
Comments
Accuracy of the ground surface under dense canopy may be reduced due to diminished returns. Laser accuracy at swath edges may be reduced. Classification algorithms have been tailored for common terrain/vegetation combinations across the project area. Classification accuracy and ground definition may be less accurate in uncommon terrain/vegetation combinations. 
 
Missing Data
Comments
Gaps may occur due to diminished returns over water, under canopy and on materials with low laser reflectivity, such as black composite roofing. 
 
Excess Data
 
 

Acquisition Info

Platform Type
Aerial 
Assembly
Single 
Tile Size
2 km 
 
 

Point Cloud Data Details

Scan Rate (Hz)
31Hz 
Footprint Size (m)
0.36000001m 
Point Density Actual (pts/m2)
2points/m2 
Ellipsoid Provided
0 
 
 

Survey Details

Sensor

Title
Optech ALTM Pegasus 
Identifier
Aerial

Type
LIDAR 
 

Aerial Survey Details

Runs
34 
Run Orientation
Various 
Swath Width
872 
Side Overlap
25 
Flying Height Unit
agl metre 
Flight Height
1200 
 
 


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