Tutorial M02 002 Check Files QGIS GPKG

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Introduction

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

Method

This tutorial introduces:

Review the check files:

  1. Navigate to the Module_02\TUFLOW\check folder and open the following layers into QGIS:
    • M02_5m_001_DEM_Z.tif
    • M02_5m_002_DEM_Z.tif
  2. Drag and drop M02_5m_002_Check.gpkg into QGIS and select the M02_5m_002_sh_obj_check_R layer.
  3. Use the 'Apply TUFLOW Styles to Open Layers'.
  4. Use tge 'Apply GPKG Layer Names'.
  5. The DEM_Z grid shows the final elevations including any topographic modifications used for the model calculations.
  6. 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.
  7. Use the Profile Tool plugin to compare the DEM_Z files from both model runs.

    Animation M02 Check 002 01.gif

  8. The first no merge region raises all elevation points to a single value.

    Animation M02 Check 002 03.gif

  9. The second no merge region adds a specified value to all elevation points.

    Animation M02 Check 002 02.gif

  10. The merge region used for the farm dam rehabilitation interpolates between all perimeter elevation points.

    Animation M02 Check 002 04b.gif

  11. 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.

    Animation M02 Check 002 05b.gif

  12. Zoom to the landscape files and review the TIN triangles and elevations created by the points, line and region using the merge option.

    Animation M02 Check 002 06b.gif

  13. Open the following file from the Module_02\TUFLOW\check folder:
    • M02_5m_002_DEM_M.tif
  14. Right click on the DEM_M file and select 'Properties'.
  15. From 'Render Type', select 'Palletted/Unique Values'.
  16. Click 'Classify', five unique values appear referring to the material specified in the 2d_mat_M02_landscape and materials.csv file. Click 'OK'.
  17. The DEM_M shows the final material ID values. Change the labels to match the material class as shown below.

    Animation M02 Check 002 07b.gif


Conclusion

  • The topographic modifications representing different development sites were assessed using the Profile Tool.
  • The DEM_M grid was used to review the land use.


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