How to break a single polygon into multiple polys?

Question

I created voronoi polygons after which I dissolved them on the basis of one attribute. Now there are cases where in for one single attribute "abc" I have3 polygons at different places with same object id. I would like to break these into 3 polygons as they are at different locations.

Any tool in ArcGIS or QGIS which can help me in doing that.

Thank You.

Answer 1

I think that what you actually want to do is to convert multipart polygons into singlepart polygons.

In ArcGIS it can be done using Multipart To Singlepart (Data Management) tool.

Answer 2

In QGIS vector menu, you'll also find Multipart To Singlepart.

Answer 3

You should specify option SINGLE_PART when running ArcGIS Dissolve tool.

Answer 4

Another Less elegant option is to click the Explode button in Advanced Editing toolbar in Arcgis after selecting all features in Layer.

Answer 5

As Alex said, there is an option/check box in Arcgis 9.3 Dissolve tool, - "Create multipart features", it is "checked" as default. Hope this will help you.