[Qgis-user] Digitizing lines

[Johan Nilsson]

Have an old map that I have scanned and georeferenced.  I have some lines I
whant to digitize to a polyline layer.  If I roughly make some vertex and
click on the raster line, red squares automaticaly appers and follow the
line, and I think the Advanced Digitizing kicks in? Have set snapping to
appropiate level, that can work on the most parts. Probably not all because
the ink go together in some places.

How do I save and let the red squares be a polyline and save the to the
polyline layer?

Are there a tutorial for Advanced Digitizing?

How to set "Snapping and Digitizing Options?

Snapping mode:
Snap to:
Tolerance:

[ ]  Enable topological editing
[ ]  Enable snapping on intersect

Have not digitizing before, so my terminology may be wrong. Have tried
convert raster to vektor, but it was many error, and more work the clean...

/Cheers
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