3D Modeling of Trees using DSM for forest Application

Presented byPresented byAnand R,Anand R,

200712101200712101ME Geoinformatics, final yearME Geoinformatics, final year

IRS, Anna UniversityIRS, Anna University

GUIDE : Dr.L.Subbaraj, GUIDE : Dr.L.Subbaraj, Scientist Scientist IRS ,Anna UniversityIRS ,Anna University

Objectives completed :

1. Tree parameters have been extracted using MicroStation with TerraScan & TerraModel It includes

• Tree height• Attributes height range• Distance between two crown points • Shape of trees (ie circle or ellipse)• Top canopy area

2. 3D Tree Model

• Algorithm framed• Coding completed for coordinates display in 3D space

• 3D tree model (in progress)..

Stages of Work : (using Micro Station)

1. File.XYZ points are loaded and displayed in 3D space.

2. DSM is created for the entire area with default classes which include ground ,high vegetation, medium vegetation, low vegetation, low points.

3. The points are classified based on ground, low vegetation and low points.

4. Now the ground and non-ground points are classified and separated.

5. Contour is generated for the non-ground points and the crown points are identified manually.

6. It gives the Tree height information and attribute height range.

Point cloud with default classes

Classified ground points

Low points are classified

Contour generated (3000m x 3500 m)

Zoomed view of contour 5m interval

Showing contour top elevation

Showing contour bottom elevation

Distance between two tree crown points

3D Tree algorithm

Display 3D co-ordinates

Start

Create 3D contour

Input1 : Tree.xyz data

Create solid tree model

Interpolation

End

Input 2: Image. tiff Image Processing

Create 2D Contour

Matching Fitting

ConnectingFilling

Surface

Each layers boundary points are separately connected. Creating 2D contour

fig 1 - 2D Contour

Connecting Points

Create solid surface of each layer.

layer 1 layer 2 layer 3

2D Solid Surface

layers converted to filled surface

Filled surface

Conclusion

• Tree parameters are identified by processing data using

microstation with terrascan and terramodel.

• Creating tree model in progress..

Thank you