North East CMA - LiDAR

dataset
Dataset: North East CMA - LiDAR Assembly: Single
 
Citation proposal Citation proposal

North East CMA - LiDAR

Department of Transport and Planning

Description

Title
North East CMA - LiDAR 
 
 

Temporal

Time period
2012-03-062012-03-06 
 
 

Spatial

Horizontal Accuracy
0.2m 
Vertical Accuracy
0.1m 
Code
MGA Zone 55 GDA94 
 
 

Format

Title
LAS 1.2 
 
 

Contacts

  Point of contact

  Custodian

 
 

Keywords

Topic category
  • Elevation
 
 

Resource Constraints

Use limitation
General 
Classification
Unclassified 
 
 

Lineage

Description
LiDAR was acquired in ellipsoid co-ordinates by logging against a position solution obtained from the onboard IMU and GPS and the Victorian CORS network. The LiDAR was then checked against an ellipsoid control composed of surveyed ground control points and adjusted if required. The ellipsoid co-ordinates were then reduced to AHD using AusGeoid09 (Beta 7 and V1.01). Checks against AHD control resulted in a further general and local adjustments where required. An automated algorithm, tailored to the project, was used to classify ground and non ground returns. The results were manually checked using intensity imagery and the algorithm adjusted and the process reiterated until a clean ground surface was produced. Points more than 30cm above the classified ground surface are classified as non ground. 
 
 

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. Laser accuracy at swath edges may be reduced. There is no difference in the processing of returns over water and over land. 
 
Missing Data
Comments
Gaps in the point cloud may have occurred due to gate range restrictions over areas with large terrain elevation differences. These were reflown to ensure full coverage. Gaps may occur due to diminished returns over water and materials with low laser reflectivity, such as black composite roofing. 
 
Excess Data
 
 

Acquisition Info

Platform Type
Aerial 
Assembly
Single 
Tile Size
1 km 
 
 

Point Cloud Data Details

Scan Rate (Hz)
37Hz 
Footprint Size (m)
0.36000001m 
Point Density Actual (pts/m2)
2points/m2 
Ellipsoid Provided
0 
 
 

Survey Details

Sensor

Title
Leica ALS50-II 
Identifier
Aerial

Type
LIDAR 
 

Aerial Survey Details

Run Orientation
Not Entered 
Flying Height Unit
Not Entered 
 
 


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