Talk:QGIS Tips: Difference between revisions
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[[File:QGiS Elevation Profile.jpg]]
== Alternate method for generating grid from points ==
Tested on QGIS 1.8.
Install the Sextante plugin, this is a useful tool that incorporates the modules from many other open source GIS packages into Quantum. You will also need to install Saga and set the path of the Saga executable in the Sextante options and configuration menu (under analysis in QGIS).
[[File:QGIS_Sextante.jpg]]
The Saga modules should now all be available in the Sextante Toolbox.<br>
Load the Zpt file, in the Sextante toolbox select the ''Saga >>> Grid - Gridding >>> Shapes to Grid'' module. Fill out the appropriate options,<br>
*'''attribute''' should be set as elevation,
*'''target grid''' is user defined,
*'''output extent''' you must click the three dots on the right hand side and select your point file, this will ensure that your grid has the same extent as point file,
*'''cellsize''' I set the cell size to the same size as the grid used in Tuflow.
For more advanced options check out the other gridding modules that Saga (and Grass) offer. If you need to interpolate between points, there are multiple options availableoptions such as Tin, Kriging, Spline etc
[[File:QGIS_Points_to_Grid.jpg]]
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