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I know how to generate contour lines from a DEM file once the file is loaded in QGIS and I also know how to open the attribute table for the contour lines which show elevation against IDs. Is there a way to look at elevation values against sets of longitude and latitude values in QGIS? In other words, is there a way to extract and look at XYZ data from a DEM file in QGIS?

Salman Ahmed
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  • You could export the DEM as text XYZ but it wouldn't load in most text viewers.. what are you trying to do with the Z for an X,Y? Are you trying to script this? How are you going to determine the X,Y to sample with, a point from a feature class, a mouse click..? You could have a look at https://gis.stackexchange.com/questions/120555/get-value-of-clicked-raster-cell and see if that suits your needs. – Michael Stimson Apr 27 '17 at 05:19
  • I was planning to use a mouse click to get the elevation value – Salman Ahmed Apr 27 '17 at 05:54
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    Using a mouseclick for elevation can be done with the 'identify' tool, which gives you the pixel values for locations you click. – Kersten Apr 27 '17 at 06:59

2 Answers2

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If I understand correctly, you want to export elevation attributes from a DEM to a point layer?

To do that, you can use the Point Sampling Tool plugin to do just that. Make sure both layers have the same CRS, and run the tool.

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The result is a new point layer with an elevation attribute field

HDunn
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  • For now, I only have the DEM file (raster). How do I get a points layer? Do I just make a new vector layer and add random points to it? – Salman Ahmed Apr 28 '17 at 06:30
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Two possible solutions come to mind: In QGIS there's the plugin "Point Sampling Tool", and in GRASS the module: v.what.rast. Both of these extract values from a raster for each feature in a point layer.

Micha
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