This documents presents the new features available in the CFD meteodyn WT in version 4.5. Improvements in terms of performance and available input datafiles are presented as well as new tool like overlapping or smoothing algorithm.

1. New features in Meteodyn WT 4.5
March 2013

2. Release information
• New input formats for topography data
• Improvement of the input data process
• New overlapping tool
• New smoothing tool
• Improvement in the Statistical graphics tools

3. Release information
• New input formats for topography data
• Improvement of the input data process
• New overlapping tool
• New smoothing tool
• Improvement in the Statistical graphics tools

4. New formats
• New input formats for topography data
– Shape file for topography (orography and roughness)
– Color Tiff file for roughness
Available formats in Meteodyn WT
Orography: map, xyz, dxf, shp
Roughness: map, xyz, chm, shp, tiff/tif
Topography: map
Pre loaded database available for roughness value(Corine Land Cover for
Europe, NLCD for US, …)

5. SHAPE in practice
A *.shp file is a vector data format describing geometries like points, polylines
or polygones which contain different types of information.
Mandatory files related to shape file:
- SHP: shape format  geometry
- SHX: shape index format –> a positional index of the feature
geometry to allow seeking forwards and backwards quickly.
- DBF: attribute format
When using a shp file it is necessary to have the .DBF and .SHX files associated with your
shape file in the same folder.

6. SHAPE in practice
Orography
The user is able to specify a new attribute
for elevation data

7. SHAPE in practice
Roughness

8. SHAPE in practice
Roughness
Roughness length code available database
CLC Corine Land Cover 100m resolution
Europe
LULC Croatia, Bosnia, 5m resolution
Macedonia, Serbia
NLCD National Land Cover 30m resolution
Database  US and
Puerto Rico

9. TIFF in practice
TIFF COLOR
Not TIFF index (in
progress)
Automatically
deduced from the
file
Available database :
CLC, NLCD, UCL
+
User database

10. TIFF in practice
In case of user database:
Roughness
length

11. New formats: in practice
In progress:
Global roughness database with a resolution of
around 300 meters
Generated by ESA(European Spatial Agency)

12. Release information
• New input formats for topography data
• Improvement of the input data process
• New overlapping tool
• New smoothing tool
• Improvement in the Statistical graphics tools

13. Input data process
Roughness and elevation data process is now optimized
 “save and check” faster
“Display”  faster view of the site
Mesh and global computation faster
Time reduced by a factor of 3 to 5 thanks to improvements and
optimization in the code of the software

14. Input data process
Example for 5 sites
Site Name Characteristics Radius (m)
Site 1 Semi complex and forested terrain 4,000
Site 2 Complex and forested terrain 6,000
Site 3 Coastal area 9,500
Site 4 Complex and forested area 5,000
Site 5 Coastal area 15,000

15. Release information
• New input formats for topography data
• Improvement of the input data process
• New overlapping tool
• New smoothing tool
• Improvement in the Statistical graphics tools

16. Overlapping tool
Before: it was possible to overlap several files but was not adapted to customers’ problematic
The idea is to have the possibility to define two neighboring forested zones with different
densities
Overlapping parameters:
By default, grid resolution = 25 m
What kind of files can be overlapped?
Only files that have the same format
(extension)
For orography:
No process on data files
A large file is created: merge of the different
orographic files
For roughness:
Hierarchy in the files in the site windows

17. Overlapping tool
Example of roughness maps – map format
roughness11.map
roughness3.map

18. Overlapping tool
Example of roughness maps – map format

19. Overlapping tool
Example of roughness maps – shape format
Shp1_1.shp
Shp1_2.shp
312
Rugo = 0,7
211
Rugo = 0,06
No information outside the blue lines
Shp1_3.shp
324
Rugo = 0,35
No information inside and outside the pink lines

20. Overlapping tool
Example of roughness maps – shape format

21. Overlapping tool
Example of roughness maps – shape format

22. Release information
• New input formats for topography data
• Improvement of the input data process
• New overlapping tool
• New smoothing tool
• Improvement in the Statistical graphics tools

23. Smoothing tool
The smoothing can be activated by
the user in case of divergence
problem due to hilly areas
In case the user is sure that the
divergence comes from sharp
elevation data, smoothing is the first
thing to try to avoid divergence
Better convergence rate in
case of very sharp elevation
data

24. Smoothing tool
1. Smoothing of the 4 boundaries
2. Propagation of the smoothing
until the radius is reached
3. At the radius distance, there is no
smoothing
Do not use this option for small sites
(less than 10 km for radius)

25. Smoothing tool
Results on a complex site
more than 900m difference in elevation for a radius domain of 12 km
Convergence rate obtained with / without smoothing tool

26. Release information
• New input formats for topography data
• Improvement of the input data process
• New overlapping tool
• New smoothing tool
• Improvement in the Statistical graphics tools

27. Statistical graphics tools
More information on Weibull parameters directly available in this window
Useful for customers who work with other software (windpro / windfarmer/ …)
These software use Weibull parameter for production estimation

28. Statistical graphics tools
Example for a directional display