[Qgis-user] How to get a subset of polygons crossed by lines?

[Patrick Giraudoux]

YES !

Works perfect and does exactly what was expected.

Many thanks,

Patrick


Le 01/05/2015 16:31, Michael Treglia a écrit :
> Hi Patrick,
>
> I haven't had experience with using the intersect tool in QGIS, but 
> looks like a spatial query (with the Spatial Query Plugin) can do what 
> you want - see a tutorial here, starting around step 22:
> http://www.qgistutorials.com/en/docs/performing_spatial_queries.html
>
> (after you get the result, there will be a list of feature IDs that 
> are selected based on the query, and there will be an icon on the 
> screen to create a new layer with the selected features)
>
> I just did it with a test dataset and it performed as expected.
>
> Hope that helps
> mike
>
> On Fri, May 1, 2015 at 2:10 AM, Patrick Giraudoux 
> <patrick.giraudoux at univ-fcomte.fr 
> <mailto:patrick.giraudoux at univ-fcomte.fr>> wrote:
>
>     Hello,
>
>     I have a question related to how the function "intersect" works. I
>     have two shapefiles, one of lines the others of polygons. I would
>     like to get into a shapefile the polygons that are intersected by
>     the lines. I tried unsuccessfully using Vector > Geoprocessing
>     tools > intersect. In this case, if the input is the lines and the
>     intersect the polygon, I can split the lines according to the
>     border of each polygon, and each segment is identified by the
>     polygon name in the attribute, but this is not what I want to. If
>     I do the  reverse, I get an empty polygon vector file.
>
>     What I want is the shapefile of the subset of polygons that
>     intersect the lines...
>
>     Any idea about how to proceed ?
>
>     Patrick
>
>     PS: for info, the expected result can be easily obtained in R,
>     package 'rgeos', function 'gIntersection'
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