Re: [Qgis-user] QGIS mailing lists in NABBLE

[Stefano Campus]

thank you for your help, andrea.
please write again to qgis nabble admin in order to open the italian ml too.

thank you

s.



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Re: [Qgis-user] split polygon with lines seems not working correctly

[Andrea Giudiceandrea]

Hi Luigi,
I think you can proceed this way:

- using the "Polygons to lines" tool, convert your the polygon layer
(building.shp) to lines

- using the "Merge vector layers" tool, merge your line layer (line.shp) and
the layer generated by the previous step

- using the "Polygonize" tool, create a new polygon layer from the layer
generate by the previous step

As a side note, it seems to me that the reference system of your layers is
wrong: it is set as geographic 4326:WGS84 but the coordinates of the
vertices are clearly in meters and not in degrees, so it should be a
projected coordinate system like an UTM one.




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Re: [Qgis-user] split polygon with lines seems not working correctly

[David Greenewalt]

Luigi,

I see the problem now, I would suggest:

1. Polygons to Lines (on the Buildings layer)

2. Merge vector Layers (lines-from-buildings, and line layer)

3. Polygonize (merged layer)

4. Join Attributes from Location (New polygons, building layer) 
(Geometric predicate = within)


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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Re: [Qgis-user] split polygon with lines seems not working correctly

[chris hermansen]

Luigi and list,

On Wed, Jun 10, 2020 at 8:32 AM Luigi Raffaele Sapone <
studioingsap...@live.com> 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?
>
>
> Feeling like the "you must use polygons ogre" here...

If you union your split lines and building lines and create polygons from
that result, then you have all the space-enclosing polygons you need.  You
can transfer the attributes from the original buildings polygons to these
new "sub-building" polygons.


-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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Re: [Qgis-user] split polygon with lines seems not working correctly

[Luigi Raffaele Sapone]

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  Per conto di 
qgis-user-requ...@lists.osgeo.org
Inviato: mercoledì 10 giugno 2020 19:02
A: qgis-user@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.cho...@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)


--

Message: 1
Date: Wed, 10 Jun 2020 08:35:03 +
From: Richard McDonnell 
To: Riccardo D'Alvito ,
"qgis-user@lists.osgeo.org" 
Subject: Re: [Qgis-user] Cut shapefiles
Message-ID: <3acfb00ccdf0493db4b8e0ea7f197...@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  On Behalf Of Riccardo 
D'Alvito
Sent: 09 June 2020 17:43
To: qgis-user@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
-- next part --
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--

Message: 2
Date: Wed, 10 Jun 2020 02:51:27 -0700 (MST)
From: Andrea Giudiceandrea 
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS mailing lists in NABBLE
Message-ID: <1591782687069-0.p...@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 

Re: [Qgis-user] split polygon with lines seems not working correctly

[David Greenewalt]

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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[Qgis-user] split polygon with lines seems not working correctly

[Luigi Raffaele Sapone]

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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Re: [Qgis-user] QGIS mailing lists in NABBLE

[Andrea Giudiceandrea]

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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Re: [Qgis-user] QGIS mailing lists in NABBLE

[Andrea Giudiceandrea]

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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Re: [Qgis-user] Cut shapefiles

[r . chogan]

Thank you guys, I solved the problem with Polygonize tool!You're very kind!Regards,Il 10 giu 2020 10:35, Richard McDonnell  ha scritto:

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
 


——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

——
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Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36

Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
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https://www.opw.ie

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From: Qgis-user 
On Behalf Of Riccardo D'Alvito
Sent: 09 June 2020 17:43
To: qgis-user@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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Re: [Qgis-user] Cut shapefiles

[Richard McDonnell]

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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FRM Data Management

--
Oifig na nOibreacha Poibl?
Office of Public Works

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Jonathan Swift Street, Trim, Co Meath, C15 NX36
--
M +353 87 688 5964 T +353 1 647 6543
https://www.opw.ie

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From: Qgis-user  On Behalf Of Riccardo 
D'Alvito
Sent: 09 June 2020 17:43
To: qgis-user@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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