Difference between revisions of "Tutorial M02 002 Check Files QGIS GPKG"
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<li>Use the Profile Tool plugin to compare the DEM_Z files from both model runs. <br> | <li>Use the Profile Tool plugin to compare the DEM_Z files from both model runs. <br> | ||
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| − | + | {{Video|name=Animation_M02_Check_002_01.mp4|width=1279}}<br> | |
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<li>The first no merge region raises all elevation points to a single value.<br> | <li>The first no merge region raises all elevation points to a single value.<br> | ||
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| − | + | {{Video|name=Animation_M02_Check_002_03.mp4|width=1279}}<br> | |
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<li>The second no merge region adds a specified value to all elevation points.<br> | <li>The second no merge region adds a specified value to all elevation points.<br> | ||
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| − | + | {{Video|name=Animation_M02_Check_002_02.mp4|width=1279}}<br> | |
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<li>The merge region used for the farm dam rehabilitation interpolates between all perimeter elevation points.<br> | <li>The merge region used for the farm dam rehabilitation interpolates between all perimeter elevation points.<br> | ||
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| − | + | {{Video|name=Animation_M02_Check_002_04b.mp4|width=1279}}<br> | |
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<li>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.<br> | <li>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.<br> | ||
<br> | <br> | ||
| − | + | {{Video|name=Animation_M02_Check_002_05b.mp4|width=1279}}<br> | |
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<li>Zoom to the landscape files and review the TIN triangles and elevations created by the points, line and region using the merge option. <br> | <li>Zoom to the landscape files and review the TIN triangles and elevations created by the points, line and region using the merge option. <br> | ||
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| − | + | {{Video|name=Animation_M02_Check_002_06b.mp4|width=1279}}<br> | |
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<li>Open the following file from the '''Module_02\TUFLOW\check''' folder: | <li>Open the following file from the '''Module_02\TUFLOW\check''' folder: | ||
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<li>The DEM_M shows the final material ID values. Change the labels to match the material class as shown below.<br> | <li>The DEM_M shows the final material ID values. Change the labels to match the material class as shown below.<br> | ||
<br> | <br> | ||
| − | + | {{Video|name=Animation_M02_Check_002_07b.mp4|width=1279}}<br> | |
</ol> | </ol> | ||
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Revision as of 12:31, 14 August 2023
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:
- Open the file, either:
- Within the QGIS Browser Panel, navigate to Module_02\TUFLOW\check\M02_5m_002_Check.gpkg and double click the following layer, or
- M02_5m_002_sh_obj_check_R
- In File Explorer, navigate to the Module_02\TUFLOW\check folder, drag and drop the M02_5m_002_Check.gpkg into the QGIS workspace and select the layer above.
- 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
- Use the 'Apply TUFLOW Styles to Open Layers'.
- Use the 'Apply GPKG Layer Names'.
- The DEM_Z grid shows the final elevations including any topographic modifications used for the model calculations.
- 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.
- Use the Profile Tool plugin to compare the DEM_Z files from both model runs.
- The first no merge region raises all elevation points to a single value.
- The second no merge region adds a specified value to all elevation points.
- The merge region used for the farm dam rehabilitation interpolates between all perimeter elevation points.
- 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.
- Zoom to the landscape files and review the TIN triangles and elevations created by the points, line and region using the merge option.
- Open the following file from the Module_02\TUFLOW\check folder:
- M02_5m_002_DEM_M.tif
- Right click on the DEM_M file and select 'Properties'.
- From 'Render Type', select 'Palletted/Unique Values'.
- Click 'Classify', five unique values appear referring to the material specified in the 2d_mat_M02_landscape and materials.csv file. Click 'OK'.
- The DEM_M shows the final material ID values. Change the labels to match the material class as shown below.
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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