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I'm trying to generate an outline of multiple elevation lines which I can use to cut into some other elevation lines. I understand that I can buffer and dissolve to get the result I'm after, but whenever I try this the calculation runs to 78% and then stops, and I get a very short popup message on my task bar that says "no message."

I'm running an I7 12 core, 64 bit, 32GB ram, QGIS v 2.6.1.

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  • You could try to only calculate your stuff on a subset of your data. That way you can see if there is a general problem with the workflow you want to perform, or if it "merely" is a problem with the data amount. Also: do you use a 64 bit QGis? If you use 32 bit this will only be able to use about 3,5 GB of RAM.
    – til_b
    Dec 22, 2014 at 9:10
  • Thanks - I cut the data in half and it is now working. I'm using the 64bit QGIS so I don't know why this was an issue.
    – Ben Hall
    Dec 23, 2014 at 0:08

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Try creating a convex hull using the vector tool menu and generate a single feature "create single minimum convex hull". I think that will give you the outline of the line features you are looking for.

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