View source for QGIS Creating a Grid from Points

=Introduction=
In this page a DEM is created from point shapefile containing elevations. For this example the zpt_check file from module 1 of the TUFLOW tutorial model will be used, but the process can apply to any point layer. This is useful for visualising the final elevations for a model simulation from a TUFLOW Zpt Check file.
=Method=
<ol>
<li>Install the Interpolation Plugin via '''Plugins >>> Manage and Install Pllugins'''</li>
<li>Open the desired shapefile in QGIS.</li>
<li>Select ''Raster >>> Interpolation'' from the menu items.</li>
<li>In the '''Input''' section of the Interpolation dialogue, use the drop down list to select the appropriate Vector Layer, select the attribute to interpolate. This is the '''Elevation''' attribute if using a check file. Select '''Add''' to include this in the interpolation.</li>
<li>In the '''Output''' section of the dialogue:
*Set a interpolation method. For this demonstration a TIN method is used, but feel free to experiment. 
*Set the X and Y cell size to an appropriate number (half the cell size if using a zpt_check file).
*Specify the output file name.</li>
[[File:TuteM01 QGIS zpt check 01.png|frame|none]]
<br>
<li>Select OK and the interpolation will be processed, this may take a few minutes depending on the number of points.</li>
<li>In the properties dialogue, set the Style Colormap to "Pseudocolor" for a quick visualisation, or alternatively set a custom colormap.  The grid should appear as below.
:'''Tip:''' To enable relief shading see <u>[[QGIS_Relief_Shading | the relief shading tip in the QGIS tips and tricks]]</u>.
[[File:TuteM01 QGIS zpt check 02.png|frame|none]]
</ol>
<br>
<br>
{{Tips Navigation
|uplink=[[QGIS_Tips | Back to QGIS Tips And Tricks]]
}}