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 <[email protected] <mailto:[email protected]>> 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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