QGIS Create a TIN: Difference between revisions
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<li>The resulting layer, called '''Draped''' will appear in the QGIS Layers panel. Right click '''Draped''' and select 'Rename Layer'. Rename the layer to '''Draped_Polygon'''.
:'''Note:''' This tool assigns elevations to the vertices of the input layer ('''Densified_Polygon''') and outputs a layer of the same type (in this case, a polygon). As such, '''Draped_Polygon''' contains only one attribute.
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==Generate IDW Interpolation==
Generate
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<li> In QGIS, load all Z shape points layers within the polygon extent (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_P''').
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==Extract Elevation of Breakline Vertices From IDW Interpolation==
Extract elevation at breakline vertices from '''Interpolated''' using the QGIS processing tool 'Drape (set Z value from raster)'. For more information about this tool, please refer to <u>[https://docs.qgis.org/3.
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<li> In QGIS, load the breaklines layer (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_L''').
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==Create TIN Mesh==
Create a TIN Mesh using the QGIS processing tool 'TIN Mesh Creation'. This tool will generate a TIN mesh from the above outputs and any Z shape points layers (points layers containing elevation data). For more information about this tool, please refer to <u>[https://docs.qgis.org/3.
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<li>Go to 'Mesh' in the Processing Toolbox panel and select 'TIN Mesh Creation'. This opens the dialog shown below:
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*Output format: 2DM
*Output coordinate system: Use the project CRS.
*Output file: Save to the model's '''grid''' folder ('''TUFLOW\model\grid''').
<li>Click 'Run'. Once the tool is finished, click 'Close'. <br>
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