[Qgis-user] Elevation Profiles

[krishna Ayyala]

Andrea,
Thanks a lot for your help.
Regards.

On Sun, Mar 6, 2022 at 5:49 AM Andrea Giudiceandrea via Qgis-user <
qgis-user at lists.osgeo.org> wrote:

> *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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