QGIS Create a TIN - Revision history

Emilie Nielsen: /* Introduction */

2026-01-28T03:55:51Z

Introduction

← Older revision		Revision as of 13:55, 28 January 2026
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	=Introduction=		=Introduction=
	TUFLOW offers powerful tools for modifying a model's geometry, including generating Triangulated Irregular Networks (TINs) from input data. Alternatively, as outlined on this page, users can create TINs in QGIS before importing them into TUFLOW. The advantage of this approach is that it allows the user to visualise and review the TINs before they are included in the model.		TUFLOW offers powerful tools for modifying a model's geometry, including generating Triangulated Irregular Networks (TINs) from input data. Alternatively, as outlined on this page, users can create TINs in QGIS before importing them into TUFLOW. The advantage of this approach is that it allows the user to visualise and review the TINs before they are included in the model.
			:'''Note:''' The QGIS TUFLOW Plugin tool <u>[[QGIS_TIN_Polygons_Assign_Elevations\|TIN Polygons - Assign Elevations]]</u> can also be used to assign elevations to a TIN polygon, using a raster.<br>

	To demonstrate the workflow, the DEM and GIS files from <u>[[Tutorial_M02#Part_2_-_Other_Topographic_Updates\|Tutorial Module 2 (part 2)]]</u> are used as examples. The tutorial dataset can be downloaded from the <u>[[Tutorial_Introduction\|Tutorial Model Introduction]]</u>. The instructions below refer to the GeoPackage format, but Shapefile format is also supported.		To demonstrate the workflow, the DEM and GIS files from <u>[[Tutorial_M02#Part_2_-_Other_Topographic_Updates\|Tutorial Module 2 (part 2)]]</u> are used as examples. The tutorial dataset can be downloaded from the <u>[[Tutorial_Introduction\|Tutorial Model Introduction]]</u>. The instructions below refer to the GeoPackage format, but Shapefile format is also supported.

Emilie Nielsen: /* Create TIN Mesh */

2026-01-22T03:54:27Z

Create TIN Mesh

← Older revision		Revision as of 13:54, 22 January 2026
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	*Output format: 2DM		*Output format: 2DM
	*Output coordinate system: Use the project CRS.		*Output coordinate system: Use the project CRS.
	*Output file: Save to the model's '''grid''' folder ('''TUFLOW\model\grid'''). ~~Ensure~~ the file extension is '''.2dm''' (e.g. '''TIN_Mesh.2dm''').		*Output file: Save to the model's '''grid''' folder ('''TUFLOW\model\grid'''). Name the TIN and ensure the file extension is '''.2dm''' (e.g. '''TIN_Mesh.2dm''').
	<li>Click 'Run'. Once the tool is finished, click 'Close'. <br>		<li>Click 'Run'. Once the tool is finished, click 'Close'. <br>
	<br>		<br>

Emilie Nielsen: /* Create TIN Mesh */

2026-01-22T03:52:55Z

Create TIN Mesh

← Older revision		Revision as of 13:52, 22 January 2026
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	==Create TIN Mesh==		==Create TIN Mesh==
	Create a TIN Mesh using the QGIS processing tool 'TIN Mesh Creation'. This tool will generate a TIN mesh from the above outputs and any Z shape points layers (points layers containing elevation data). For more information about this tool, please refer to <u>[https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/mesh.html#tin-mesh-creation QGIS Documentation - TIN Mesh Creation]</u>.		Create a TIN Mesh using the QGIS processing tool 'TIN Mesh Creation'. This tool will generate a TIN mesh from the above outputs and any Z shape points layers (points layers containing elevation data). For more information about this tool, please refer to <u>[https://docs.qgis.org/3.40/en/docs/user_manual/processing_algs/qgis/mesh.html#tin-mesh-creation QGIS Documentation - TIN Mesh Creation]</u>.
	<ol>		<ol>
	<li>Go to 'Mesh' in the Processing Toolbox panel and select 'TIN Mesh Creation'. This opens the dialog shown below:		<li>Go to 'Mesh' in the Processing Toolbox panel and select 'TIN Mesh Creation'. This opens the dialog shown below:

Emilie Nielsen: /* Extract Elevation of Breakline Vertices From IDW Interpolation */

2026-01-22T03:52:09Z

Extract Elevation of Breakline Vertices From IDW Interpolation

← Older revision		Revision as of 13:52, 22 January 2026
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	==Extract Elevation of Breakline Vertices From IDW Interpolation==		==Extract Elevation of Breakline Vertices From IDW Interpolation==
	Extract elevation at breakline vertices from '''Interpolated''' using the QGIS processing tool 'Drape (set Z value from raster)'. For more information about this tool, please refer to <u>[https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#drape-set-z-value-from-raster QGIS Documentation - Drape]</u>.		Extract elevation at breakline vertices from '''Interpolated''' using the QGIS processing tool 'Drape (set Z value from raster)'. For more information about this tool, please refer to <u>[https://docs.qgis.org/3.40/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#drape-set-z-value-from-raster QGIS Documentation - Drape]</u>.
	<ol>		<ol>
	<li> In QGIS, load the breaklines layer (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_L''').		<li> In QGIS, load the breaklines layer (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_L''').

Emilie Nielsen: /* Generate IDW Interpolation */

2026-01-22T03:51:15Z

Generate IDW Interpolation

← Older revision		Revision as of 13:51, 22 January 2026
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	==Generate IDW Interpolation==		==Generate IDW Interpolation==
	Generate a IDW (Inverse Distance Weighted) interpolation of the Z shape points layer (points layer containing elevation data), using the QGIS processing tool 'IDW Interpolation'. For more information about this tool, please refer to <u>[https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/interpolation.html#qgisidwinterpolation QGIS Documentation - IDW Interpolation]</u>.		Generate an IDW (Inverse Distance Weighted) interpolation of the Z shape points layer (points layer containing elevation data), using the QGIS processing tool 'IDW Interpolation'. For more information about this tool, please refer to <u>[https://docs.qgis.org/3.40/en/docs/user_manual/processing_algs/qgis/interpolation.html#qgisidwinterpolation QGIS Documentation - IDW Interpolation]</u>.
	<ol>		<ol>
	<li> In QGIS, load all Z shape points layers within the polygon extent (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_P''').		<li> In QGIS, load all Z shape points layers within the polygon extent (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_P''').

Emilie Nielsen: /* Extract Elevation of Polygon Vertices from DEM */

2026-01-22T03:49:51Z

Extract Elevation of Polygon Vertices from DEM

← Older revision		Revision as of 13:49, 22 January 2026
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	<br>		<br>
	<li>The resulting layer, called '''Draped''' will appear in the QGIS Layers panel. Right click '''Draped''' and select 'Rename Layer'. Rename the layer to '''Draped_Polygon'''.		<li>The resulting layer, called '''Draped''' will appear in the QGIS Layers panel. Right click '''Draped''' and select 'Rename Layer'. Rename the layer to '''Draped_Polygon'''.
			:'''Note:''' This tool assigns elevations to the vertices of the input layer ('''Densified_Polygon''') and outputs a layer of the same type (in this case, a polygon). As such, '''Draped_Polygon''' contains only one attribute.
	</ol>		</ol>

Emilie Nielsen: /* Extract Elevation of Polygon Vertices from DEM */

2026-01-22T03:40:01Z

Extract Elevation of Polygon Vertices from DEM

← Older revision		Revision as of 13:40, 22 January 2026
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	==Extract Elevation of Polygon Vertices from DEM==		==Extract Elevation of Polygon Vertices from DEM==
	Extract elevation at polygon vertices from DEM using the QGIS processing tool 'Drape (set Z value from raster)'. For more information about this tool, please refer to <u>[https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#drape-set-z-value-from-raster QGIS Documentation - Drape]</u>.		Extract elevation at polygon vertices from DEM using the QGIS processing tool 'Drape (set Z value from raster)'. For more information about this tool, please refer to <u>[https://docs.qgis.org/3.40/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#drape-set-z-value-from-raster QGIS Documentation - Drape]</u>.
	<ol>		<ol>
	<li> In QGIS, open the DEM file (e.g. '''TUFLOW\model\grid\DEM.tif''').		<li> In QGIS, open the DEM file (e.g. '''TUFLOW\model\grid\DEM.tif''').

Emilie Nielsen at 03:38, 22 January 2026

2026-01-22T03:38:12Z

← Older revision		Revision as of 13:38, 22 January 2026
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	=Introduction=		=Introduction=
	TUFLOW offers powerful tools for modifying a model's geometry, including generating Triangulated Irregular Networks (TINs) from input data. Alternatively, users can create TINs in QGIS before importing them into TUFLOW. The advantage of this approach is that it allows the user to visualise and review the TINs before they are included in the model.		TUFLOW offers powerful tools for modifying a model's geometry, including generating Triangulated Irregular Networks (TINs) from input data. Alternatively, as outlined on this page, users can create TINs in QGIS before importing them into TUFLOW. The advantage of this approach is that it allows the user to visualise and review the TINs before they are included in the model.

	To demonstrate the workflow, the DEM and GIS files from <u>[[Tutorial_M02#Part_2_-_Other_Topographic_Updates\|Tutorial Module 2 (part 2)]]</u> are used as examples. The instructions below refer to the GeoPackage format, but Shapefile format is also supported.		To demonstrate the workflow, the DEM and GIS files from <u>[[Tutorial_M02#Part_2_-_Other_Topographic_Updates\|Tutorial Module 2 (part 2)]]</u> are used as examples. The tutorial dataset can be downloaded from the <u>[[Tutorial_Introduction\|Tutorial Model Introduction]]</u>. The instructions below refer to the GeoPackage format, but Shapefile format is also supported.

	To create a TIN in QGIS, the following files are needed:		To create a TIN in QGIS, the following files are needed:
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	=Method=		=Method=
	==Densify Polygon Vertices==		==Densify Polygon Vertices==
	Densify the polygon vertices using the QGIS processing tool 'Densify by Interval'. For more information about this tool, please refer to the <u>[https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#densify-by-interval QGIS Documentation - Densify by Interval]</u>.		Densify the polygon vertices using the QGIS processing tool 'Densify by Interval'. For more information about this tool, please refer to the <u>[https://docs.qgis.org/3.40/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#densify-by-interval QGIS Documentation - Densify by Interval]</u>.
	<ol>		<ol>
	<li>In QGIS, open the polygon layer (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_R''').<br>		<li>In QGIS, open the polygon layer (e.g. '''TUFLOW\model\gis\2d_zsh_M02_landscape_002_R''').<br>

Emilie Nielsen: /* Update TUFLOW Geometry Control File (TGC) */

2025-02-16T22:33:42Z

Update TUFLOW Geometry Control File (TGC)

← Older revision		Revision as of 08:33, 17 February 2025
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	<tt><font color="blue">Set Zpts </font><font color="red">==</font> 100 <font color="green"> ! Sets every 2D elevation zpt to 100 metres</font></tt><br>		<tt><font color="blue">Set Zpts </font><font color="red">==</font> 100 <font color="green"> ! Sets every 2D elevation zpt to 100 metres</font></tt><br>
	<tt><font color="blue">Read GRID Zpts </font><font color="red">==</font> grid\DEM.tif <font color="green"> ! Assigns the elevation of zpts from the grid</font></tt><br>		<tt><font color="blue">Read GRID Zpts </font><font color="red">==</font> grid\DEM.tif <font color="green"> ! Assigns the elevation of zpts from the grid</font></tt><br>
	~~<s>~~<tt><font color="~~blue~~">Read GIS Z Shape ~~</font><font color~~=~~"red">~~=~~=</font>~~ 2d_zsh_M02_landscape_002_R \| 2d_zsh_M02_landscape_002_L \| 2d_zsh_M02_landscape_002_P ~~<font color="green">~~ ! Defines areas of complex landscaping</font></tt~~></s~~><br>		<tt><font color="green">! Read GIS Z Shape == 2d_zsh_M02_landscape_002_R \| 2d_zsh_M02_landscape_002_L \| 2d_zsh_M02_landscape_002_P ! Defines areas of complex landscaping</font></tt><br>
	<tt><font color="blue">Read TIN Zpts </font><font color="red">==</font> grid\TIN_Mesh.2dm \| 2d_zsh_M02_landscape_002_R <font color="green"> ! Defines areas of complex landscaping</font></tt><br>		<tt><font color="blue">Read TIN Zpts </font><font color="red">==</font> grid\TIN_Mesh.2dm \| 2d_zsh_M02_landscape_002_R <font color="green"> ! Defines areas of complex landscaping</font></tt><br>

Emilie Nielsen at 22:52, 12 February 2025

2025-02-12T22:52:50Z

← Older revision		Revision as of 08:52, 13 February 2025
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	<span style="color:#FF0000">
	<font size = 18>Page Under Construction</font>
	</span>

	=Introduction=		=Introduction=
	TUFLOW offers powerful tools for modifying a model's geometry, including generating Triangulated Irregular Networks (TINs) from input data. Alternatively, users can create TINs in QGIS before importing them into TUFLOW. The advantage of this approach is that it allows the user to visualise and review the TINs before they are included in the model.		TUFLOW offers powerful tools for modifying a model's geometry, including generating Triangulated Irregular Networks (TINs) from input data. Alternatively, users can create TINs in QGIS before importing them into TUFLOW. The advantage of this approach is that it allows the user to visualise and review the TINs before they are included in the model.