QGIS: Merge polygons leaves line segments behind

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I am trying to merge several polygons together based upon an attribute... I have tried by QGIS' dissolve and merge functions. Both leave behind stray polylines once theyve completed (see pre and post example screenshots below). Im assuming this is a result of the shapefile and a tolerance for line geometry?

Has anyone else had this problem and found something that works?

thanks

mike

pre-merge

post-merge

2 Answers

I snapped the vertices and still had a line segment, so I created a new feature that laid over the offending line and made sure two of the new feature's vertices were snapped to the line's two endpoints. Then I merged this new feature to the one with the ghost line segment, and the ghost segment went away.

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