I have a shapefile exported from a hydraulics software that I use. The file is exported as polylines. I convert it to a point layer using the "Extract Nodes" function. The remaining piece of information I need is the elevation (z value) of each point. I know they exist because I can see them, in the Vertex editor and the wkt_geom column when I copy paste to Excel. I see the "z()" function but can't figure out the appropriate syntax.
I tried this:
Is there a function, or a work-around, similar to the $x and $y functions to extract the z value from the geometry and display it in the attribute table?
I am talking about a point shapefile, and using QGIS 2.18.