QGIS TIN Polygons Assign Elevations - Revision history

Emilie Nielsen: /* Parameters */

2025-03-18T07:02:51Z

Parameters

← Older revision		Revision as of 17:02, 18 March 2025
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	* '''Densify:''' Additional vertices will be inserted along the perimeter of the polygon layer at regular intervals (defined by "Vertex Interval"). This option is recommended unless the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.		* '''Densify:''' Additional vertices will be inserted along the perimeter of the polygon layer at regular intervals (defined by "Vertex Interval"). This option is recommended unless the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.
	* '''Use Existing:''' Elevations will be assigned to the existing vertices of the polygon layer. This option should only be used if the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.		* '''Use Existing:''' Elevations will be assigned to the existing vertices of the polygon layer. This option should only be used if the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.
	<li>'''Vertex Interval (only used for Densify):''' The maximum interval distance between the vertices to be created (in map units). Since ~~the~~ polygon ~~perimeter~~ may not be evenly divisible by this value, the tool adjusts the interval lengths as needed while ensuring that this value remains the maximum. This value should be set to the smaller of the following:		<li>'''Vertex Interval (only used for Densify):''' The maximum interval distance between the vertices to be created (in map units). Since each polygon segment may not be evenly divisible by this value, the tool adjusts the interval lengths as needed while ensuring that this value remains the maximum. This value should be set to the smaller of the following:
	* Half the model cell size		* Half the model cell size
	* The ~~finest~~ Quadtree ~~level~~		* The minimum Quadtree cell size
	<li>'''Output Points Layer:''' Determines the location and filename of the output points layer. It is recommended to name the output layer with the prefix '2d_zsh'.		<li>'''Output Points Layer:''' Determines the location and filename of the output points layer. It is recommended to name the output layer with the prefix '2d_zsh'.
	<li>'''Output Polygon Layer:''' Determines the location and filename of the output polygon layer. This layer will have the output points snapped to the polygon vertices. It is recommended to name the output layer with the prefix '2d_zsh'.		<li>'''Output Polygon Layer:''' Determines the location and filename of the output polygon layer. This layer will have the output points snapped to the polygon vertices. It is recommended to name the output layer with the prefix '2d_zsh'.

Emilie Nielsen: /* Usage */

2025-03-18T06:57:49Z

Usage

← Older revision		Revision as of 16:57, 18 March 2025
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	* '''Densify:''' Additional vertices will be inserted along the perimeter of the polygon layer at regular intervals (defined by "Vertex Interval"). This option is recommended unless the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.		* '''Densify:''' Additional vertices will be inserted along the perimeter of the polygon layer at regular intervals (defined by "Vertex Interval"). This option is recommended unless the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.
	* '''Use Existing:''' Elevations will be assigned to the existing vertices of the polygon layer. This option should only be used if the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.		* '''Use Existing:''' Elevations will be assigned to the existing vertices of the polygon layer. This option should only be used if the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.
	<li>'''Vertex Interval (only used for Densify):''' The maximum interval between the vertices to be created (in map units). Since the polygon perimeter may not be evenly divisible by this value, the tool adjusts the interval lengths as needed while ensuring that this value remains the maximum. This value should be set to the smaller of the following:		<li>'''Vertex Interval (only used for Densify):''' The maximum interval distance between the vertices to be created (in map units). Since the polygon perimeter may not be evenly divisible by this value, the tool adjusts the interval lengths as needed while ensuring that this value remains the maximum. This value should be set to the smaller of the following:
	* Half the model cell size		* Half the model cell size
	* The finest Quadtree level		* The finest Quadtree level

Emilie Nielsen: /* Parameters */

2025-03-18T06:46:51Z

Parameters

← Older revision		Revision as of 16:46, 18 March 2025
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	* '''Densify:''' Additional vertices will be inserted along the perimeter of the polygon layer at regular intervals (defined by "Vertex Interval"). This option is recommended unless the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.		* '''Densify:''' Additional vertices will be inserted along the perimeter of the polygon layer at regular intervals (defined by "Vertex Interval"). This option is recommended unless the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.
	* '''Use Existing:''' Elevations will be assigned to the existing vertices of the polygon layer. This option should only be used if the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.		* '''Use Existing:''' Elevations will be assigned to the existing vertices of the polygon layer. This option should only be used if the polygon layer has a negative 'Shape_Width' value, and a sufficient number of vertices.
	<li>'''Vertex Interval (only used for Densify):''' The ~~length of the~~ interval between the vertices to be created (in map units). This value should be set to the smaller of the following:		<li>'''Vertex Interval (only used for Densify):''' The maximum interval between the vertices to be created (in map units). Since the polygon perimeter may not be evenly divisible by this value, the tool adjusts the interval lengths as needed while ensuring that this value remains the maximum. This value should be set to the smaller of the following:
	* Half the model cell size		* Half the model cell size
	* The finest Quadtree level		* The finest Quadtree level

Emilie Nielsen: /* Introduction */

2025-03-04T23:39:22Z

Introduction

← Older revision		Revision as of 09:39, 5 March 2025
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	== Introduction ==		== 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>		This tool acts as an alternative method to using the native "MERGE" functionality in TUFLOW for 2d_zsh polygons. The TUFLOW Z shape merge option obtains elevations by triangulation of the Zpt values (Zc, Zu, Zv and Zh) not the DEM triangulation, as outlined in the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u>. This processing tool allows the user to explicitly assign elevation points from a DEM layer (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>		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>

Emilie Nielsen: /* Usage */

2025-02-11T23:53:06Z

Usage

← Older revision		Revision as of 09:53, 12 February 2025
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	</ol>		</ol>
	<br>		<br>
			[[File:QGIS_TUFLOW_TIN_Polygons_Assign_Elevations_Dialog_01.png]]
	[[File:.png\|link=Special:FilePath/.png]]
	<br><br>		<br><br>

Emilie Nielsen at 23:04, 10 February 2025

2025-02-10T23:04:33Z

← Older revision		Revision as of 09:04, 11 February 2025
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	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:		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:
	<ol>		<ol>
	<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. ~~Additional line and point layers may also be included.~~		<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. <br>
			'''Note:''' Other Z shape layers (points and lines), may also be specified in the model, using the same " <tt><font color="blue">Read GIS Z Shape</font><font color="red"> ==</font></tt> " command (shown in the example below).
	<li>Run the tool to generate a new polygon and points layer. The polygon layer will optionally have additional vertices, and the points layer will have elevations assigned.		<li>Run the tool to generate a new polygon and points layer. The polygon layer will optionally have additional vertices, and the points layer will have elevations assigned.
	<li>The TGC command is then updated to reference the newly generated layers, instead of the original polygon. For example:<br>		<li>The TGC command is then updated to reference the newly generated layers, instead of the original polygon. For example:<br>
	Before:<br>		'''Before:'''<br>
	<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_example_polygon ! ~~And~~ ~~potentially~~ ~~other~~ ~~line~~ ~~and~~ ~~point~~ ~~layers~~</tt><br>		<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_example_polygon \| 2d_zsh_example_lines \| 2d_zsh_example_points <font color="green"> ! Topography Features</font></tt><br>
	After:<br>		'''After:'''<br>
	<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_generated_polygon \| 2d_zsh_generated_points ! ~~And~~ ~~potentially~~ ~~other~~ ~~line and~~ ~~point~~ ~~layers~~</tt>		<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_generated_polygon \| 2d_zsh_generated_points \| 2d_zsh_example_lines \| 2d_zsh_example_points <font color="green"> ! Topography Features</font></tt>
	</ol>		</ol>

Emilie Nielsen at 06:26, 10 February 2025

2025-02-10T06:26:06Z

← Older revision		Revision as of 16:26, 10 February 2025
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	<ol>		<ol>
	<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. Additional line and point layers may also be included.		<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. Additional line and point layers may also be included.
	<li>Run the tool to generate a new polygon and ~~point~~ layer. The polygon layer will optionally have additional vertices, and the ~~point~~ layer will have elevations assigned.		<li>Run the tool to generate a new polygon and points layer. The polygon layer will optionally have additional vertices, and the points layer will have elevations assigned.
	<li>The TGC command is then updated to reference the newly generated layers, instead of the original polygon. For example:<br>		<li>The TGC command is then updated to reference the newly generated layers, instead of the original polygon. For example:<br>
	Before:<br>		Before:<br>

RustyJonesTUFLOW: Some minor adjustments to workflow

2025-02-06T11:55:07Z

Some minor adjustments to workflow

← Older revision		Revision as of 21:55, 6 February 2025
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	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:		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:
	<ol>		<ol>
	<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>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. Additional line and point layers may also be included.
	<li>Run the tool to generate a new ~~points~~ ~~(containing~~ ~~the~~ ~~elevation~~ ~~data)~~ and ~~polygon~~ layer.		<li>Run the tool to generate a new polygon and point layer. The polygon layer will optionally have additional vertices, and the point layer will have elevations assigned.
	<li>The TGC command is then updated to reference the newly generated layers, instead of the original polygon. For example:<br>		<li>The TGC command is then updated to reference the newly generated layers, instead of the original polygon. For example:<br>
	Before:<br>		Before:<br>
	<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_example_polygon</tt><br>		<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_example_polygon ! And potentially other line and point layers</tt><br>
	After:<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>		<tt><font color="blue">Read GIS Z Shape</font><font color="red"> == </font> 2d_zsh_generated_polygon \| 2d_zsh_generated_points ! And potentially other line and point layers</tt>
	</ol>		</ol>

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	</ol>		</ol>
	<br>		<br>
	[[File:.png]]		[[File:.png\|link=Special:FilePath/.png]]
	<br><br>		<br><br>

Emilie Nielsen at 06:23, 6 February 2025

2025-02-06T06:23:18Z

@@ Line 1: / Line 1: @@
 == 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.
+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>
 == Usage ==

Emilie Nielsen at 00:53, 6 February 2025

2025-02-06T00:53:47Z

← Older revision		Revision as of 10:53, 6 February 2025
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	<ol>		<ol>
	<li>'''Polygon Layer:''' The polygon layer that will have elevation points created for it.		<li>'''Polygon Layer:''' The polygon layer that will have elevation points created for it.
	<li>'''Selected features only:''' If ~~channel~~(s) in the ~~conduits~~ layer have been selected using the 'Select Features' tool, this option will become available. If checked on, the tool will only ~~create~~ ~~1D/2D~~ ~~connections~~ ~~for~~ the selected ~~channel~~(s).		<li>'''Selected features only:''' If region(s) in the polygon layer have been selected using the 'Select Features' tool, this option will become available. If checked on, the tool will only assign elevation points along the perimeter of the selected region(s).
	<li>'''Raster Layer:''' The raster (DEM) layer that will be used to determine the elevations of the output points.		<li>'''Raster Layer:''' The raster (DEM) layer that will be used to determine the elevations of the output points.
	<li>'''Vertex Distribution Option:''' Determines how the vertices will be distributed along the polygon perimeter.		<li>'''Vertex Distribution Option:''' Determines how the vertices will be distributed along the polygon perimeter.