I'm looking for a way to continue a line feature in QGIS. I have checked the Digitizing Tools plugin (both regular and advanced) for a Prolong Line tool, but I haven't had luck. In ArcGIS there's a Continue Feature button when editing but I haven't found one so far in QGIS. I'm looking for a way to do this while editing/digitizing rather than through code. Can this be done?
The Digitizing Tools plugin has to amend line function
applies to: line layer (multi or single part)
Continue editing existing online features. Just click any end point of an existing line and digitize new vertices as if you would digitize the new feature.
In the next release (8 july 2016) this wil be fixed. Have a look at http://changelog.linfiniti.com/en/qgis/version/2.16.0/
There you can read:
Feature: Extend linestring geometries with reshape tool
The reshape tool now allows you to extend linestrings, by starting a reshape at either a line's start or end point.
This feature was developed by Martin Dobias
Untill then you can do what Mapperz suggests
In QGIS 3.4 (and probably before that), you can use the ‘Vertex’ tool (which is next to ‘Add line’ on the toolbar, by default). Choose it, then hover the mouse over the ending or starting point of a line, and you'll see a plus symbol next to it—this allows you to continue the line. Similarly, it allows you to add a new point between other two by hovering the cursor there and clicking on the plus symbol that appears.