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I'm using QGIS 2.18.15 and have somehow ended up with the following on my screen. I've deselected every layer and these green X's and red lines persist. I cannot "undo" to remove them.

What are they & how do I get rid of them?

They may have originally been related to a duplicate node or something like that, but I have no idea what's going on.

enter image description here

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    They appear when you build an invalid geometry, such as self-intersecting ones – JGH Feb 2 '18 at 23:54
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You are in the middle of editing or creating a new line feature. If you toggle the layer visibility you still see the half-created feature, and if you toggle editing off in that layer you'll still see it!

If you re-activate the layer visibility of whichever layer it is, and re-enable editing, you might find you need to finish creating the element before saving the layer. Delete the feature if you don't need it.

The green crosses are self-intersections that show this is an invalid geometry - you should also have seen a warning like "Add feature: segments 0 and 2 of line 0 intersect at -2.35695756492, 0.44230006192 Geometry has 1 errors. Validation finished"

  • I've occasionally encountered a similar issue where either the digitizing red lines or the identify feature red outline lingered on the map after the tool was deactivated. In these cases the problem was solved by closing and re-opening the program. – csk Feb 13 '18 at 20:29

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