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Tutorial M02 002 GIS Inputs QGIS GPKG: Difference between revisions

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<font size = 18>Page Under Construction</font>
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= Introduction =
QGIS is used to create, import and view input data.<br>
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Create a new GeoPackage Database:
<ol>
<li>Navigate to the '''Module_02\TUFLOW\model\gis''' folder. Save a copy of '''M02_001.gpkg''' as '''M02_002.gpkg'''.
<li>Save a copy of '''M02_001.gpkg''' as '''M02_002.gpkg'''.
</ol>
 
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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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[[File:{{Video|name=Animation_M02_GPKG_GIS_002_02.gif]]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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[[File:{{Video|name=Animation_M02_GPKG_GIS_002_01.gif]]mp4|width=1279}}<br>
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<li>Turn off editing to save the edits.<br>
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[[File:{{Video|name=Animation_M02_GPKG_GIS_002_03.gif]]mp4|width=1279}}<br>
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:*Shape_Width = -1<br>
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[[File:{{Video|name=Animation_M02_GPKG_GIS_002_04.gif]]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>
<br>
{{Video|name=Animation_M02_GIS_05.mp4|width=1279}}<br>
[[File:Animation M02 GIS 05.gif]]<br>
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Investigate the supplied '''2d_zsh_M02_landscape_002''' files with TIN functionality:
<ol>
<li>Open the files, either: <br>
:*DragWithin andthe dropQGIS Browser Panel, navigate to '''M02_002.gpkg''' intoand thedouble QGIS workspace and selectclick the layers (hold Ctrl to select multiple), or
:*In the BrowserFile PanelExplorer, navigatedrag toand drop the '''M02_002.gpkg''' andinto doublethe QGIS workspace and clickselect the layers (hold Ctrl to select multiple).
<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. TheWith the 'Shape_Option' attribute 'TIN', the 'dZShape_Width' attribute specifies a sampling distance for the TIN triangles, intermediate sampling points are created at the line vertices and along the line at 'dZShape_Width' intervals.
<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_GPKG_GIS_002_TIN_02.mp4|width=1279}}<br>
[[File:Animation_M02_GPKG_GIS_002_TIN_01.gif]]<br>
</ol>
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Investigate the supplied materials file:
<ol>
<li>Load into QGIS the '''2d_mat_M02_landscape_002_R''' file by, either: <br>
:*DragWithin andthe dropQGIS Browser Panel, navigate to '''Module_02/TUFLOW/model/gis/M02_002.gpkg''' into the QGIS workspace and selectdouble click '''2d_mat_M02_landscape_002_R''', or
:*In the BrowserFile PanelExplorer, navigatedrag toand drop the '''Module_02/TUFLOW/model/gis/M02_002.gpkg''' andinto doublethe QGIS workspace and clickselect '''2d_mat_M02_landscape_002_R'''.
<li>Inspect the file:
:*The materials file contains polygons that represent the updated land use due to the topography modifications.
:*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>
[[File:Animation M02_GIS_mat_05.gif]]<br>
</ol>
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