QGIS Extract Ground Elevation - Revision history

ElizaCollison at 05:26, 6 January 2023

2023-01-06T05:26:52Z

← Older revision		Revision as of 15:26, 6 January 2023
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	* Define ground elevation at 1D nodes/pits snapped to 1D channel/pipes		* Define ground elevation at 1D nodes/pits snapped to 1D channel/pipes
	* etc...		* etc...
	In the example below, the "Z" attribute (ground elevation) of the 2d_zsh point layer in the [[~~Tutorial_Module03~~ \| TUFLOW Tutorial 03]] is extracted from DEM file.		In the example below, the "Z" attribute (ground elevation) of the 2d_zsh point layer in the [[Tutorial_M11 \| TUFLOW Tutorial 11]] is extracted from DEM file.

	=Method=		=Method=

Chris Huxley at 01:42, 21 February 2018

2018-02-21T01:42:35Z

← Older revision		Revision as of 11:42, 21 February 2018
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	<ol>		<ol>
	<li>Ensure that DEM and 2d_zsh line layer files are opened, and the Point Sampling Tool plugin has been installed (Plugins >> Manage and Install Plugins >> Point Sampling Tool) </li>		<li>Ensure that DEM and 2d_zsh line layer files are opened, and the Point Sampling Tool plugin has been installed (Plugins >> Manage and Install Plugins >> Point Sampling Tool) </li>
	<li>Convert line ~~vertexes~~ to points, using the preferred method described in [[QGIS_Convert_Lines_to_Points \| ~~this~~ ~~page~~]]</li>		<li>Convert line vertices to points, using the preferred method described in the [[QGIS_Convert_Lines_to_Points \| QGIS Convert Lines to Points]] page</li>
	<li>Open the Point Sampling Tool</li>		<li>Open the Point Sampling Tool</li>
	[[File:QGIS Extract Ground Elevation 001.png\|700px]]		[[File:QGIS Extract Ground Elevation 001.png\|700px]]
Line 19:		Line 19:
	<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>		<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>
	[[File:QGIS Extract Ground Elevation 002.png\|600px]]<br>		[[File:QGIS Extract Ground Elevation 002.png\|600px]]<br>
	~~Now this~~ point layer is ready to be input with the 2d_zsh line layer.		This point layer is now ready to be input with the 2d_zsh line layer into the TUFLOW model.
	</ol>		</ol>

Chris Huxley: /* Method */

2018-02-21T01:34:49Z

Method

← Older revision		Revision as of 11:34, 21 February 2018
Line 8:		Line 8:
	=Method=		=Method=
	<ol>		<ol>
	<li>Ensure that DEM and 2d_zsh line layer files are opened, and the Point Sampling Tool plugin has been installed</li>		<li>Ensure that DEM and 2d_zsh line layer files are opened, and the Point Sampling Tool plugin has been installed (Plugins >> Manage and Install Plugins >> Point Sampling Tool) </li>
	<li>Convert line vertexes to points, using the preferred method described in [[QGIS_Convert_Lines_to_Points \| this page]]</li>		<li>Convert line vertexes to points, using the preferred method described in [[QGIS_Convert_Lines_to_Points \| this page]]</li>
	<li>Open the Point Sampling Tool</li>		<li>Open the Point Sampling Tool</li>

ShuangGao: /* Method */

2018-02-19T23:45:24Z

Method

← Older revision		Revision as of 09:45, 20 February 2018
Line 19:		Line 19:
	<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>		<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>
	[[File:QGIS Extract Ground Elevation 002.png\|600px]]<br>		[[File:QGIS Extract Ground Elevation 002.png\|600px]]<br>
	Now this point layer is ready to be input with the line layer.		Now this point layer is ready to be input with the 2d_zsh line layer.
	</ol>		</ol>

ShuangGao: /* Method */

2018-02-19T23:43:29Z

Method

← Older revision		Revision as of 09:43, 20 February 2018
Line 8:		Line 8:
	=Method=		=Method=
	<ol>		<ol>
	<li>Ensure that DEM and 2d_zsh line layer files are opened, and the Point Sampling Tool plugin has been ~~loaded~~</li>		<li>Ensure that DEM and 2d_zsh line layer files are opened, and the Point Sampling Tool plugin has been installed</li>
	<li>Convert line vertexes to points, using the preferred method described in [[QGIS_Convert_Lines_to_Points \| this page]]</li>		<li>Convert line vertexes to points, using the preferred method described in [[QGIS_Convert_Lines_to_Points \| this page]]</li>
	<li>Open the Point Sampling Tool</li>		<li>Open the Point Sampling Tool</li>

ShuangGao: /* Introduction */

2018-02-19T23:42:50Z

Introduction

← Older revision		Revision as of 09:42, 20 February 2018
Line 4:		Line 4:
	* Define ground elevation at 1D nodes/pits snapped to 1D channel/pipes		* Define ground elevation at 1D nodes/pits snapped to 1D channel/pipes
	* etc...		* etc...
	In the example below, the ground elevation ~~for~~ the 2d_zsh point layer in the [[Tutorial_Module03 \| TUFLOW Tutorial 03]] is extracted from ~~the~~ DEM file.		In the example below, the "Z" attribute (ground elevation) of the 2d_zsh point layer in the [[Tutorial_Module03 \| TUFLOW Tutorial 03]] is extracted from DEM file.

	=Method=		=Method=

ShuangGao: /* Introduction */

2018-02-19T23:41:28Z

Introduction

← Older revision		Revision as of 09:41, 20 February 2018
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	=Introduction=		=Introduction=
	This page describes the method for extracting ground elevation (or any other variable) from raster files or polygon attribute using "Point Sampling Tool". This method is useful when you want to:		This page describes the method for extracting ground elevation (or any other variable) from raster files or polygon attribute using "Point Sampling Tool". This method is useful when you want to:
	* Extract ground elevation ~~for the~~ points snapped to breaklines		* Extract ground elevation at points snapped to breaklines
	* Define ground elevation ~~for~~ 1D nodes/pits snapped to 1D channel/pipes		* Define ground elevation at 1D nodes/pits snapped to 1D channel/pipes
	* etc...		* etc...
	In the example below, the ground elevation for the 2d_zsh point layer in the [[Tutorial_Module03 \| TUFLOW Tutorial 03]] is extracted from the DEM file.		In the example below, the ground elevation for the 2d_zsh point layer in the [[Tutorial_Module03 \| TUFLOW Tutorial 03]] is extracted from the DEM file.

ShuangGao: /* Method */

2018-02-19T23:40:21Z

Method

← Older revision		Revision as of 09:40, 20 February 2018
Line 18:		Line 18:
	The plugin will create a new point layer file which contains all attributes in a 2d_zsh layer and the bed elevation as the 5th attribute.		The plugin will create a new point layer file which contains all attributes in a 2d_zsh layer and the bed elevation as the 5th attribute.
	<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>		<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>
	[[File:QGIS Extract Ground Elevation 002.png\|600px]]		[[File:QGIS Extract Ground Elevation 002.png\|600px]]<br>
	Now this point layer is ready to be input with the line layer.		Now this point layer is ready to be input with the line layer.
	</ol>		</ol>

ShuangGao: /* Method */

2018-02-19T23:40:00Z

Method

← Older revision		Revision as of 09:40, 20 February 2018
Line 18:		Line 18:
	The plugin will create a new point layer file which contains all attributes in a 2d_zsh layer and the bed elevation as the 5th attribute.		The plugin will create a new point layer file which contains all attributes in a 2d_zsh layer and the bed elevation as the 5th attribute.
	<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>		<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>
			[[File:QGIS Extract Ground Elevation 002.png\|600px]]
	Now this point layer is ready to be input with the line layer.		Now this point layer is ready to be input with the line layer.
	</ol>		</ol>

ShuangGao: /* Method */

2018-02-19T23:39:21Z

Method

← Older revision		Revision as of 09:39, 20 February 2018
Line 11:		Line 11:
	<li>Convert line vertexes to points, using the preferred method described in [[QGIS_Convert_Lines_to_Points \| this page]]</li>		<li>Convert line vertexes to points, using the preferred method described in [[QGIS_Convert_Lines_to_Points \| this page]]</li>
	<li>Open the Point Sampling Tool</li>		<li>Open the Point Sampling Tool</li>
	[[File:QGIS Extract Ground Elevation 001.png\|~~800px~~]]		[[File:QGIS Extract Ground Elevation 001.png\|700px]]
	<li>Set the following:<br>		<li>Set the following:<br>
	* Select the point layer converted at step 2 as the "Layer containing sampling points"		* Select the point layer converted at step 2 as the "Layer containing sampling points"
Line 17:		Line 17:
	* Set the output layer file name		* Set the output layer file name
	The plugin will create a new point layer file which contains all attributes in a 2d_zsh layer and the bed elevation as the 5th attribute.		The plugin will create a new point layer file which contains all attributes in a 2d_zsh layer and the bed elevation as the 5th attribute.
			<li>Open the Attribute Table of the newly created layar. Toggle editing and update "Z" attribute with "dem_m01" as shown in the image below</li>
			Now this point layer is ready to be input with the line layer.
	</ol>		</ol>
	[[File:QGIS Lines to Points.jpg\|500px]]