Title

Tungamah LiDAR 

Time period

2013-10-252013-10-25 

Horizontal Accuracy

0.18m  

Vertical Accuracy

0.1m  

Code

MGA Zone 55 GDA94 

Title

LAS 1.2 Classification Level 2 

Topic category

• Elevation

Use limitation

General 

Classification

Unclassified  

Description

LiDAR data captured using onboard GPS, IMU and network of ground basestations. Trajectories and laser data corrected initially using the AusGeoid09 and then adjusted to AHD using local PSMs. LiDAR data is classified into multiple ground and non-ground classes. Project model key points classified from Ground class automatically; Vegetation (high, medium and low) classified automatically; Bridges classified manually. Ground points are selected from the laser point cloud through iteratively building a triangulated surface model. The building size gives the starting surface point density and the iteration angle determines how close a point has to be to the surface to be included. Ground point thinning is an iterative process similar to ground point classification. 

Classification

Unclassified  

Attribute Quality

Positional Accuracy

Conceptual Consistency

Comments

Consistent with specification 

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

Platform Type

Aerial  

Assembly

Single  

Tile Size

2 km  

Scan Rate (Hz)

31Hz  

Scan Frequency (kHz)

70kHz  

Scan Angle (degrees)

25degrees  

Footprint Size (m)

0.30000001m  

Point Density Actual (pts/m2)

1points/m2  

Point Spacing Actual (pts/m)

1points/m2  

Ellipsoid Provided

1 

Ellipsoid Vertical Datum

GRS80 Ellipsoidal (ITRF2008)  

Ellipsoid Format

LAS 1.2 Classification Level 2  

Geoid Vertical Datum

AUSGEOID09  

Additional Adjustments

PMs were used as fixed reference points to which the surveyed control was adjusted. The final adjusted control was then used to adjust the laser to AHD. 

Class Level

2 

Classification

Class Level	Class 0 - Unclassified	Class 1 - Default	Class 2 - Ground	Class 3 - Low Vegetation	Class 4 - Medium Vegetation	Class 5 - High Vegetation	Class 6 - Buildings/Structures	Class 7 - Low/High Points	Class 8 - Model Key Points	Class 9- Water	Class 10 - Bridge	Class 12 - Flightline Overlap Points
2	0	0	1	1	1	1	1	0	1	1	0	1