QGIS Create a TIN

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Method

This example uses the DEM and GIS files from Tutorial Module 2 (part 2).

Densify Merge Polygon Vertices

Densify the merge polygon vertices using the QGIS processing tool 'Densify by Interval'.

1. In QGIS, go to Processing > Toolbox from the top dropdown menu options to open the Processing Toolbox.
   
   
   
   
2. Go to 'Vector geometry' in the processing tool list and select 'Densify by interval'. This opens the dialog shown below:
   • Input layer: Select the merge polygon (e.g. 2d_zsh_M02_landscape_002_R)
   • Interval between vertices to add: This value should set to the smaller of the following two values - half the model cell size, or the finest quadtree level.
   • Densified: Leave as default.
   • Tick on 'Open output file after running algorithm'.
3. Click 'Run'. Once the tool is finished, click 'Close'.
   
   
   
   
4. The resulting layer, called Densified will appear in the QGIS Layers panel. This is a copy of the merge polygon, now updated with additional vertices based on the specified interval.
5. In the QGIS Layers panel, right click Densified and select 'Rename Layer'. Rename the layer to Densified_Polygon.
   Note: To see the vertices, toggle on editing for Densified_Polygon and select the 'Vertex Tool' from the Digitizing toolbar. Hover over the polygon to see the vertices.