QGIS TIN Polygons Assign Elevations: Difference between revisions
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== Introduction ==
This tool acts as an alternative method to using the native "MERGE" functionality in TUFLOW for 2d_zsh polygons by explicitly assigning elevation points (in a 2d_zsh template) along the polygon perimeter.<br>
It is recommended to use this tool for Quadtree models, rather than the "MERGE" functionality, where the 2d_zsh input crosses Quadtree nesting levels.<br>
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'''Workflow:'''<br>
This tool is useful when a user has a Z shape polygon (2d_zsh) and wants to assign perimeter elevations. The workflow for this process would be:
<li>The user starts with a Z shape polygon (2d_zsh) that is read into the TUFLOW Geometry control file (TGC) using the "<tt><font color="blue">Read GIS Z Shape</font><font color="red"> ==</font></tt>" command.
<li>Run the tool to generate a new points (containing the elevation data) and polygon layer.
<li>The TGC command is then updated to reference the newly generated layers, instead of the original polygon. For example:<br>
Before:<br>
<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_example_polygon</tt><br>
After:<br>
<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_generated_polygon | 2d_zsh_generated_points</tt>
</ol>
== Usage ==
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