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I have a layer showing elevation curves and I'm trying to create an elevation profile using the Terrain Profile plugin. However, I only get a flat line.

I guess that I need to add Z values to the curves. The layer attribute table does have a column with height values(hoyde).

enter image description here

Can this be done?

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The "Profile Tool" plugin you are using says that it:

plots profile lines from raster layers or point vector layer with elevation field

This means that it won't work on contours which is what you have. Two options are:

or

Terrain data can be confusing on first acquaintance as there are lots of ways of representing it. There is a general tutorial here: QGIS Tutorials and Tips | Working with Terrain Data.

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    You may also be able to download a DEM for your area of interest. If available, it will be more accurate than converting the contours to a DEM, since the contours were probably created from a DEM in the first place, and you lose some information every time you do a conversion. Commented Apr 3, 2019 at 17:43

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