View source for Tutorial M02 002 Check Files QGIS GPKG

= Introduction =
QGIS is used to import the check files and review the modified elevations between both model runs. <br>
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= Method =
This tutorial introduces:
:*[[Check_Files_2d_DEM_Z | _DEM_Z]]
:*[[Check_Files_2d_sh_obj | _sh_obj_check_R]]
:*[[Check_Files_2d_DEM_M | _DEM_M]]

Review the check files: <br>
<ol>
<li>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.
<li>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'''
<li>Use the 'Apply TUFLOW Styles to Open Layers'.
<li>Use the 'Apply GPKG Layer Names'.
<li>The DEM_Z grid shows the final elevations including any topographic modifications used for the model calculations.
<li>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.
<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>
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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>
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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>
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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>
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{{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>
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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:
:*'''M02_5m_002_DEM_M.tif'''
<li>Right click on the DEM_M file and select 'Properties'.
<li>From 'Render Type', select 'Paletted/Unique Values'.
<li>Click 'Classify', five unique values appear referring to the material specified in the 2d_mat_M02_landscape and materials.csv file. Click 'OK'.
<li>The DEM_M shows the final material ID values. Change the labels to match the material class as shown below.<br>
<br>
{{Video|name=Animation_M02_Check_002_07b.mp4|width=1279}}<br>
</ol>
<br>

= 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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