QGIS Extract Ground Elevation: Difference between revisions

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Line 1: =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: * Extract ground elevation ~~for the~~at points snapped to breaklines * Define ground elevation ~~for~~at 1D nodes/pits snapped to 1D channel/pipes * etc... In the example below, the "Z" attribute (ground elevation) ~~for~~of the 2d_zsh point layer in the [[~~Tutorial_Module03~~Tutorial_M11 \| TUFLOW Tutorial 0311]] is extracted from ~~the~~ DEM file. =Method= <ol> <li>Ensure that DEM and 2d_zsh line layer files are opened, and the Point Sampling Tool plugin has been ~~loaded~~installed (Plugins >> Manage and Install Plugins >> Point Sampling Tool) </li> <li>Convert line ~~vertexes~~vertices to points, using the preferred method described in the [[QGIS_Convert_Lines_to_Points \| ~~this~~QGIS ~~page~~Convert Lines to Points]] page</li> <li>Open the Point Sampling Tool</li> [[File:QGIS Extract Ground Elevation 001.png\|700px]] 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> [[File:QGIS Extract Ground Elevation 002.png\|600px]]<br> ~~Now this~~This point layer is now ready to be input with the 2d_zsh line layer into the TUFLOW model. </ol>