QGIS Create a TIN: Difference between revisions
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=Method=
This example uses the DEM and GIS files from <u>[[Tutorial_M02#Part_2_-_Other_Topographic_Updates|Tutorial Module 2 (part 2)]]</u>.
==Densify Merge Polygon Vertices==
Densify the merge polygon vertices using the QGIS processing tool 'Densify by Interval'.
<ol>
<li>In QGIS, go to Processing > Toolbox from the top dropdown menu options to open the Processing Toolbox.<br>
<br>
[[File:open_processing_toolbox.png]]<br>
<br>
<li>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'.
<li>Click 'Run'. Once the tool is finished, click 'Close'.<br>
<br>
[[File: QGIS_Create_TIN_Densify_Polygon_01.png]]<br>
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<li>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.
<li>In the QGIS Layers panel, right click '''Densified''' and select 'Rename Layer'. Rename the layer to '''Densified_Polygon'''.<br>
'''Note:''' To see the vertices, toggle on editing for '''Densified_Polygon''' and select the 'Vertex Tool' [[File: vertex_tool_icon.png|40px]] from the Digitizing toolbar. Hover over the polygon to see the vertices.<br>
<br>
[[File: QGIS_Create_TIN_Densify_Polygon_02.png]]<br>
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</ol>
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