Tutorial M02 002 Check Files QGIS

Introduction

QGIS is used to import the check files and review the modified elevations between both model runs.

Method

This tutorial introduces:

• _DEM_Z.flt
• _sh_obj_check_R.shp

Review the check files:

1. Open the following files from the Module_02\TUFLOW\check folder:

   • M02_5m_001_DEM_Z.flt
   • M02_5m_002_DEM_Z.flt
   • M02_5m_002_sh_obj_check_R.shp

2. Use the 'Apply TUFLOW Styles to Open Layers'.
3. The DEM_Z grid shows the final elevations including any topographic modifications used for the model calculations.
4. The sh_obj_check file displays the TIN triangles created by TUFLOW during the model initialisation and is useful to review for all merge polygons.
5. Use the Profile Tool plugin to compare the DEM_Z files from both model runs.
   
   
   
   
6. The first no merge region raises all elevation points to a single value.
   
   
   
   
7. The second no merge region adds a specified value to all elevation points.
   
   
   
   
8. The merge region used for the farm dam rehabilitation interpolates between all perimeter elevation points.
   
   
   
   
9. The merge region with negative Shape_Option attribute cuts through the embankment. The manually added vertices allow the modification to follow the cross section of the channel.
   
   
   
   
10. Zoom to the landscape files and review the TIN triangles and elevations created by the points, line and region using the merge option.
    
    
    

Conclusion

• The topographic modifications representing different development sites were assessed using the Profile Tool.

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