Tutorial M02 002 GIS Inputs QGIS: Difference between revisions
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= Introduction =
QGIS is used to create, import and view input data.<br>
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= Method =
:*'''2d_zsh_M02_landscape_002_L'''▼
:*'''2d_zsh_M02_landscape_002_P'''▼
:*'''2d_zsh_M02_landscape_002_R'''▼
:*'''2d_mat_M02_landscape_002_R'''▼
▲Within the QGIS Browser Panel, navigate to the '''Module_02\Tutorial_Data''' folder. Drag and drop the following layers into the '''M02_002.gpkg''' database:
▲:*2d_zsh_M02_landscape_002_L
▲:*2d_zsh_M02_landscape_002_P
▲:*2d_zsh_M02_landscape_002_R
▲:*2d_mat_M02_landscape_002_R
Create two polygons, one raises the elevation to a set height and another raises the elevation by a set amount. <br>
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<li>Select '2d_zsh' from the Empty Type list.
<li>In the Run ID box write 'M02_fill_002'.
<li>Tick the 'Regions' Geometry Type and hit 'OK'. The 2d_zsh file appears in the Layers panel.
<li>Zoom to the area just upstream of the north road crest.<br>
<li>Right click on the '''2d_zsh_M02_fill_002_R''' to toggle on Editing and select 'Add Polygon Feature'.
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:*Shape_Option = NO MERGE (assigns a single elevation to all Zpts falling within the polygon without interpolating the edges to the original topography) <br>
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{{Video|name=Animation_M02_GIS_02.mp4|width=1279}}<br>
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<li>Zoom to the south west corner of the grid to digitise the second polygon.
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<li>Turn off editing to save the edits.<br>
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{{Video|name=Animation_M02_GIS_01.mp4|width=1279}}<br>
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<li>Select '2d_zsh' from the Empty Type list.
<li>In the Run ID box write 'M02_merge_002'.
<li>Tick the 'Regions' Geometry Type and hit 'OK'. The 2d_zsh file appears in the Layers panel. Zoom to the east side of the model. <br>
<li>Right click on the '''2d_zsh_M02_merge_002_R''' and toggle on Editing.
<li>Select 'Add Polygon Feature'.
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<li>Turn off editing to save the edits.<br>
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{{Video|name=Animation_M02_GIS_03.mp4|width=1279}}<br>
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<li>Select '2d_zsh' from the Empty Type list.
<li>In the Run ID box write 'M02_cut_002'.
<li>Tick the 'Regions' Geometry Type and hit 'OK'. The 2d_zsh file appears in the layers panel.
<li>
▲<li>The 2d_zsh file appears in the layers panel. Zoom to the channel where it meets the north road embankment. <br>
<li>Right click on the '''2d_zsh_M02_cut_002_R''' to toggle on Editing and select 'Add Polygon Feature'.
<li>Digitise a polygon similar to below, terminate the region and enter the following data in the attributes dialog: <br>
:*Shape_Width = -1<br>
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{{Video|name=Animation_M02_GIS_04.mp4|width=1279}}<br>
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<li>Add more vertices by holding Shift and double click along the upstream and downstream sides of the polygon. By default TUFLOW uses the merge option and the negative Shape_Width instructs TUFLOW to sample the DEM elevation only at the location of the polygon vertices. <br>
<li>Turn off editing to save the edits.<br>
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{{Video|name=Animation_M02_GIS_05.mp4|width=1279}}<br>
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:*Select Layer > Add layer > Add Vector Layer and navigate to the ''' Module_02\TUFLOW\model\gis''' folder.
<li>The point layer specifies the elevation with the ‘Z’ attribute. Some of the point are snapped to the line layer setting the elevations along the line.
<li>The line layer assists in the TIN process.
<li>The region layer sets the area over which the TIN functionality takes place. Without points snapped to the perimeter vertices of the region, the elevations are inserted from the underlying Zpt elevations, it uses the default merge option.<br>
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{{Video|name=Animation_M02_GIS_TIN_04.mp4|width=1279}}<br>
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:*The material attribute associated with each polygon is an integer value based on the underlying land use type.<br>
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{{Video|name=Animation_M02_GIS_mat_05.mp4|width=1279}}<br>
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