Difference between revisions of "QGIS Create a TIN"
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(Created page with "<span style="color:#FF0000"> <font size = 18>Page Under Construction</font> </span> =Introduction= =Method= ==Densify Merge Polygon Vertices==") |
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=Method= | =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 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> | ||
| + | <br> | ||
| + | <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> | ||
| + | <br> | ||
| + | </ol> | ||
Revision as of 14:31, 23 January 2025
Page Under Construction
Introduction
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'.
- In QGIS, go to Processing > Toolbox from the top dropdown menu options to open the Processing Toolbox.
- 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'.
- Click 'Run'. Once the tool is finished, click 'Close'.
- 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.
- 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.
