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I have a polygon, imported from a shapefile in QGIS. I would like transform it to a linestring instead so I can save it as a GPX file later. How can I transform a polygon to a linestring in QGIS?

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simply cutting a polygonal object won't transform it to line. you would need to do a poly to line conversion. I can tell you how to do that in arcmap. I'm sure it is just as easy in qgis. – Brad Nesom Oct 17 '11 at 14:45

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Assuming you're using QGIS >= 1.6.0, the menu option you need is Vector|Geometry Tools|Polygons to Lines, which will create a new shapefile with all the attributes of the original.

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works on 1.7> also – Brad Nesom Oct 17 '11 at 16:03

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