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I have created a line. Then, I want to create a polygon from my line. I used the Vector->Geometry Tools->Lines to polygon and a little problem happened (look at the pics, I circled it with a red color):

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Why did this happen? I have no line on the polygon where I circled red. I do not want that line on the polygon. I'm using QGIS 2.18.5.

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  • @Lassus - SAGA also has a Convert lines to polygons tool which you could try using. You can access it from the Processing Toolbox :)
    – Joseph
    Apr 3, 2017 at 9:23
  • Welcome to gis.stackexchange! Please edit the title of your question to include enough information for future visitors to be able to find this thread when looking for the same problem.
    – underdark ♦
    Apr 3, 2017 at 19:00

1 Answer 1

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You need to make sure that the lines are snapped correctly. You can set the snapping option from Settings -> Snapping option and select Snap to To vertex and segment, and set the tolerance to 10 pixels.

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Then, if the lines are not connected (split), you need to use merge tool enter image description here to merge the lines:

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Once it is snapped and merged correctly, you can use Vector->Geometry Tools->Lines to polygon and it will create a polygon correctly.

enter image description here

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