*krishna Ayyala* /Sat Mar 5 22:06:54 PST 2022/ ------------------------------------------------------------------------ Nicolas, I ran the Drape tool as shown below. It resulted in a new line feature called "Draped" and added to my map. But this new feature has exactly same attributes as that of "Lines" feature. i.e. it does not have any new field such as Z added to the attribute table.
Hi krishna Ayyala,please read the tool documentation at https://docs.qgis.org/3.22/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#qgissetzfromraster
As written in the documentation, the "Drape" tool does not add a new field with the Z coordinate value to the attribute table. It adds the Z coordinate value to each vertex in each feature geometry of the vector layer overlapping the raster layer.
In general, if you need to copy the Z coordinate value of the feature geometry in a field of the attribute table, you can use the "Extract Z values" tool with the layer containing the feature geometries with vertices that have the Z coordinate value.
Anyway, consider that a line type feature geometry is made by more than one vertex, and that the "Extract Z values" tool stores only one value for each input feature, so if you want to store the Z coordinate value for each vertex of each line type feature geometry in a field of the attribute table, then you would probably need to first extract the vertices of the line layer to a point layer and after that extract the Z value of each point.
Alternatively you could use the field calculator to perform more complex different calculation, or you could afterward perform other data processing such as e.g. aggregate the Z values of the vertices of each input line feature.
Regards. Andrea
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