QGIS Create a TIN: Difference between revisions
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TUFLOW offers powerful tools for modifying a model's geometry, including generating Triangulated Irregular Networks (TINs) from input data. Alternatively, TINs can be created in QGIS and imported into TUFLOW. The advantage of this approach is that it allows the user to visualise and review the TINs before they are included in the model.
=Method=▼
This example uses the DEM and GIS files (in GeoPackage format) from <u>[[Tutorial_M02#Part_2_-_Other_Topographic_Updates|Tutorial Module 2 (part 2)]]</u>.
▲=Method=
==Densify Merge Polygon Vertices==
Densify the merge polygon vertices using the QGIS processing tool 'Densify by Interval'. For more information about this tool, please refer to the <u>[https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#densify-by-interval QGIS Documentation - Densify by Interval]</u>.
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The TUFLOW Geometry Control File (.tgc) must be updated to reference the TIN Mesh, which will replace any topography-modifying GIS layers (Z shapes) within the mesh extent.
Remove all references to Z shapes (<tt><font color="blue">Read GIS Z Shape</font><font color="red"> ==</font></tt> ) in the TGC file and replace them with: <
:'''Note:''' The merge polygon is included in the command to ensure that the TIN is only applied within the extent of the merge polygon.
For example:<br>
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<tt><font color="blue">Read TIN Zpts </font><font color="red">==</font> grid\TIN_Mesh.2dm | 2d_zsh_M02_landscape_002_R <font color="green"> ! Defines areas of complex landscaping</font></tt><br>
=Additional Resources=
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