[Qgis-developer] Union Tool - Ftools/Sextante - How should the real result be?

[vinayan]

Hi,

At present the union tool does not give correct results in sextante/ftools.
After looking at some bug reports, I feel that even in QGIS 1.8, the union
tool was not producing the correct output either attribute-wise or
geometry-wise.

My question is how should the real output be? I have two cases here.

1. Union of a single layer against itself  - 
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX#f:singleLayerInput.png
2. Union between two different layers -
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX?lst#f:twoLayerInput.png


It looks to me that for case 1, the result could be like below(11 geometries
in total)
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX?lst#f:singleLayerResult1.png

and for case 2, the result could be like below 
https://www.dropbox.com/sh/asicnvr71vxeaz2/TKVUpdleIX?lst#f:twoLayerResult1.png

what do you think? Anybody knows how it looked in 1.8?

Thanks
Vinayan



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