[Qgis-user] Cutting lines with a polygon boundary

[Randal Hale]

What if you unioned the Layers with the polygon - then deleted the 
original polygon from the new layer? I don't know if that would work - 
every layer would then need to be touched once to clip and then again to 
delete the original polygon...but you would have a break then at each 
intersection if I understand this correctly.

Randy


On 01/25/2015 03:43 PM, Zoltan Szecsei wrote:
> On 2015/01/25 20:23, Andre Joost wrote:
>> Am 25.01.2015 um 13:51 schrieb Zoltan Szecsei:
>>
>>>
>>>
>>> So, does anyone know of a way to efficiently cut features in multiple
>>> layers using a polygon, and then to be able to select the pieces
>>> (multiple layers) that are either inside or outside the polygon, and
>>> then delete them?
>>>
>>
>> Disregarding the "multiple":
>>
>> "Vector -> Geoprocessing -> Clip" deletes the items outside the polygon
> Nope, doesn't. - In my first point I said: */Vector Geometry 
> Processing Clip, but it wants to extract the data inside the polygon 
> and create a new file with the extracted data. (To be expected)
> /*but meant: */Vector-> GeoProcessingTools-> Clip, but..... /*(my bad, 
> apologies)*/
> /*It does not delete, it clips them out into a new layer/- which is 
> not what I'm hoping to achieve./*/
> /*
> Thanks for the thought anyway, though.
> Regards,
> Zoltan*/
> /*
>> "Vector -> Geoprocessing -> Difference" deletes the items inside the 
>> polygon
>>
>> You would have to do it for every layer you want to be cut, the 
>> dialogue box will stay open after cutting. If the polygon layer 
>> contains just one polygon, no selecting is necessary.
>>
>> BTW: make sure all layers share the same CRS (i.e. turn 
>> on-the-fly-reprojection off)
>>
>> HTH,
>> André Joost
>>
>>
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>
>
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>
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-- 
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
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