[Qgis-user] split polygon with lines seems not working correctly
Luigi Raffaele Sapone
studioingsapone at live.com
Wed Jun 10 10:55:05 PDT 2020
Dear David
Thanks for your prompt reply.
I understood the need for intersection between lines and polygons. But the polygonal layer I work on can have thousands of polygons, and manually lengthening the lines is not ....feasible. A procedure would be needed to automate this operation. Or, an alternative method (transforming the line divide layer into polygons, or other procedures that can be implemented automatically, I don't know).
Regards
-----Messaggio originale-----
Da: Qgis-user <qgis-user-bounces at lists.osgeo.org> Per conto di qgis-user-request at lists.osgeo.org
Inviato: mercoledì 10 giugno 2020 19:02
A: qgis-user at lists.osgeo.org
Oggetto: Qgis-user Digest, Vol 172, Issue 15
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Today's Topics:
1. Re: Cut shapefiles (Richard McDonnell)
2. Re: QGIS mailing lists in NABBLE (Andrea Giudiceandrea)
3. Re: Cut shapefiles (r.chogan at hotmail.com)
4. Re: QGIS mailing lists in NABBLE (Andrea Giudiceandrea)
5. split polygon with lines seems not working correctly
(Luigi Raffaele Sapone)
6. Re: split polygon with lines seems not working correctly
(David Greenewalt)
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Message: 1
Date: Wed, 10 Jun 2020 08:35:03 +0000
From: Richard McDonnell <richard.mcdonnell at opw.ie>
To: Riccardo D'Alvito <r.chogan at hotmail.com>,
"qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Cut shapefiles
Message-ID: <3acfb00ccdf0493db4b8e0ea7f197b48 at opw.ie>
Content-Type: text/plain; charset="utf-8"
Hi Riccardo,
You could try the Split with Lines tool available in the Processing Toolbox, under Vector Overlay. Just use "Split" in the search bar to narrow down the list.
Hope this helps,
Richard
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From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of Riccardo D'Alvito
Sent: 09 June 2020 17:43
To: qgis-user at lists.osgeo.org
Subject: [Qgis-user] Cut shapefiles
Good evening.
I would like to cut a shapefile of areas with respect to a shapefile of lines in order to have a resulting shapefile of areas formed by the contours of the various lines.
In other words, "Polygon" has a larger extension than "Lines" . I would like to create another area shape made up of various polygons divided according to the outline of the "Lines" shapefile.
I hope I was clear.
Thanks
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Message: 2
Date: Wed, 10 Jun 2020 02:51:27 -0700 (MST)
From: Andrea Giudiceandrea <andreaerdna at libero.it>
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] QGIS mailing lists in NABBLE
Message-ID: <1591782687069-0.post at n6.nabble.com>
Content-Type: text/plain; charset=us-ascii
Richard Duivenvoorde wrote
> ?aybe contact Nabble, as personally I am not aware that we arranged
> something with them?
>
> We use osgeo-mailing lists, I'm not aware of any changes recently.
> Are other mailing lists affected?
Hi Stefano and Richard,
all the OSGeo ML were affected.
I sent an e-mail message to the OSGeo Nabble Admin two days ago, and after a few attempts, now it's allowed to post new message or replay to messages via Nabble again.
Regards
Andrea Giudiceandrea
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Message: 3
Date: Wed, 10 Jun 2020 12:15:25 +0200
From: r.chogan at hotmail.com
To: Richard McDonnell <richard.mcdonnell at opw.ie>
Cc: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Cut shapefiles
Message-ID:
<DB6P18901MB02151C54DF33BA300040D69F9F830 at DB6P18901MB0215.EURP189.PROD.OUTLOOK.COM>
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Message: 4
Date: Wed, 10 Jun 2020 04:01:52 -0700 (MST)
From: Andrea Giudiceandrea <andreaerdna at libero.it>
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] QGIS mailing lists in NABBLE
Message-ID: <1591786912755-0.post at n6.nabble.com>
Content-Type: text/plain; charset=us-ascii
Andrea Giudiceandrea wrote
> now it's allowed to post new message or replay to messages via Nabble
> again.
Actually... with the exception, form QGIS MLs, of QGIS Italian User
(qgis-it-user) and QGIS - Community Team (qgis-community-team).
For the former, Jorge Sanz. the OSGeo Nabble Admin, said that the Italian group apparently had more restrictive settings so he decided to keep them untouched, for the latter, I don't know why but maybe due to the same reason.
Regards.
Andrea
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Message: 5
Date: Wed, 10 Jun 2020 15:31:09 +0000
From: Luigi Raffaele Sapone <studioingsapone at live.com>
To: "qgis-user at lists.osgeo.org" <qgis-user at lists.osgeo.org>
Subject: [Qgis-user] split polygon with lines seems not working
correctly
Message-ID:
<VI1PR0202MB3455FE9085C04258F9B093C1D5830 at VI1PR0202MB3455.eurprd02.prod.outlook.com>
Content-Type: text/plain; charset="utf-8"
Hello
I'm using QGIS 3.12
I have a poly shapefile named building.shp in the zip file, and a line shapefile, named line.shp.
I'm using the geoprocessing function 'split polygon by line' using poly.shp as input, and line.shp as divide layer.
I obtain the 'split_by_line.shp'. But, in this splitted file, the polygon was not divided considering all the lines present, but only some of them, as visible in 'split_by_line.shp'.
Is there something wrong?
Regards
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Message: 6
Date: Wed, 10 Jun 2020 12:56:46 -0400
From: David Greenewalt <dlg at sover.net>
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] split polygon with lines seems not working
correctly
Message-ID: <95389106-835d-3eaf-cf5f-ca255c8f0c33 at sover.net>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
Luigi,
The lines must fully transect the polygon in order to split. The dotted lines in the image are examples of such lines.
Hope this helps,
David
On 6/10/2020 11:31 AM, Luigi Raffaele Sapone wrote:
>
> Hello
>
> I’m using QGIS 3.12
>
> I have a poly shapefile named building.shp in the zip file, and a line
> shapefile, named line.shp.
>
> I’m using the geoprocessing function ‘split polygon by line’ using
> poly.shp as input, and line.shp as divide layer.
>
> I obtain the ‘split_by_line.shp’. But, in this splitted file, the
> polygon was not divided considering all the lines present, but only
> some of them, as visible in ‘split_by_line.shp’.
>
> Is there something wrong?
>
> Regards
>
>
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