Data in high resolution can cause many problems with hydraulic modelling. There are several methods for thinning out datasets without loosing much accuracy of elevation data. Regular dawngridding or preparing irregular networks are in use.
I would like hear from people who have experience with processes such reduced data (especially irregular networks) in DHI software and if it was more effective for large areas.
Dear Sir,
Use Global mapper software to reduce the size and convert the dataset with relevant format to use in MIKE21
I agree there is a such possibility in mentioned software as well as in others but do you know some results of experiments concerning this subject. Simple grid downgrading is not a proper solution what was proved in reach literature...
You must convert the file of LIDAR to XYZ before using Mike 21. Then, use Mesh Generator in Mike21 of DHI to reduce data: http://s3.amazonaws.com/dhiuk_blog_storage/Guides_UK/Mesh_Generator_Step_By_Step.pdf
Mr. V.V.THAN
I found this option and I had used it - I also used Mike for flood wave simulation.
By the way, there were another task after Mesh Generator usage. How to use Mike tools to moderate resolution of mesh? I decided to change it manually in areas more critical (embankments etc). The second way I see is to moderate mesh file to have vertex in critical points saved in *.xyz file for instance obtained in Terrasolid software. What do you thing about this two ways?
You can take a look to the following study from Journal of Hydrology:
Comparison of new generation low-complexity flood inundation mapping tools with a hydrodynamic model
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