5

In QGIS 3 it is possible to extend an existing linestring by clicking on the 'virtual endpoint' cross marker as described in https://docs.qgis.org/3.10/de/docs/user_manual/working_with_vector/editing_geometry_attributes.html#digitizing-an-existing-layer

When extending a linestring along an existing feature, tracing seems not to work. Seems that I have to digitize along the feature by snapping to each of its vertices as shown here (the dotted line should trace along the thin black one, but doesn't):

example

This is a) time consuming and b) a source for errors.

I wonder if tracing does not work when extending a line string, is this not possible or am I missing something?

3

Instead of using the line extension feature, perhaps try the Reshape Features tool? This allows you to extend the line while also allowing tracing.

You may need to select the specific feature you want to extend before using Reshape Features if you have a lot of features in the same area.

enter image description here

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