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]> 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' > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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