[Qgis-user] Classify road network into dead-end links and links

Arjun Dongre adongre at west-inc.com
Mon May 2 09:02:14 PDT 2022 

You can use this method to get your endpoints:
https://gis.stackexchange.com/questions/306190/generating-start-and-end-points-for-linestrings

Buffer the points by a small amount, and intersect this buffer back with
your original shapefile. You should get the pairs of roads to
intersections. Filter as needed.

On Mon, May 2, 2022 at 11:17 AM <qgis-user-request at lists.osgeo.org> wrote:

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> Today's Topics:
>
>    1. Suscribe (Neil Christian Cadiz Rosella)
>    2. Classify road network into dead-end links and links connected
>       on both ends (Roland Spielhofer)
>    3. Re: Classify road network into dead-end links and links
>       connected on both ends (Zoltan)
>    4. Re: Classify road network into dead-end links and links
>       connected on both ends (Zoltan)
>    5. Re: Classify road network into dead-end links and links
>       connected on both ends (Roland Spielhofer)
>    6. Re: Classify road network into dead-end links and links
>       connected on both ends (Zoltan)
>    7. Re: Classify road network into dead-end links and links
>       connected on both ends (Raymond Nijssen)
>    8. Re: Classify road network into dead-end links and links
>       connected on both ends (Nicolas Cadieux)
>    9. Re: Classify road network into dead-end links and links
>       connected on both ends (Johannes Kr?ger (WhereGroup))
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 1 May 2022 21:15:06 +0200
> From: Neil Christian Cadiz Rosella <neilcadiz99 at gmail.com>
> To: qgis-user at lists.osgeo.org
> Subject: [Qgis-user] Suscribe
> Message-ID:
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> Content-Type: text/plain; charset="utf-8"
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> safegthegref
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> Message: 2
> Date: Mon, 2 May 2022 10:35:42 +0200
> From: Roland Spielhofer <rspiel at gmx.net>
> To: qgis-user <qgis-user at lists.osgeo.org>
> Subject: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID:
>
> <trinity-2a8953ec-e913-4b61-8ae8-83f37171cb9f-1651480542202 at 3c-app-gmx-bap40
> >
>
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> ------------------------------
>
> Message: 3
> Date: Mon, 2 May 2022 10:49:36 +0200
> From: Zoltan <zoltans at geograph.co.za>
> To: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID: <b9caa095-e731-bbc2-7615-d7cf906452ba at geograph.co.za>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Sigh, this is where SHP-file hell comes in - it's the scourge of GIS.
> Wouldn't it have been nice if your road network was in a data structure
> that allows you to go to each point and ask it "how many lines emanate
> from me"?
>
> Sorry, I know this is not helpful to you, but the SHP file format needed
> to have died 20 years ago.
>
> Regards,
> Zoltan
>
> On 2022-05-02 10:35, Roland Spielhofer via Qgis-user wrote:
> > Hi,
> > I have a road network (Shape linestring) where I would like to
> > classify all links that are dead-end and compute the share of the
> > dead-end links in relation to the total network length.
> > I am pretty sure this is possible in QGIS or a plugin - any pointers
> > would be appreciated.
> > Regards,
> > Roland
> >
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
>
> =============================================
> Zoltan Szecsei GPrGISc 0031
> Director, Geograph (Pty) Ltd.
> GIS and Photogrammetric Services
>
> Cape Town, South Africa.
>
> Mobile: +27-83-6004028 (Signal, not WhatsApp)
> www.geograph.co.za
> =============================================
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> ------------------------------
>
> Message: 4
> Date: Mon, 2 May 2022 10:54:12 +0200
> From: Zoltan <zoltans at geograph.co.za>
> To: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID: <80eb454e-a7ca-d3cb-2326-54193f6b984b at geograph.co.za>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> On a more helpful note, you could add 2 columns to your line-string
> attribute table and then iterate through the start and end coords of
> each line, counting the number of lines selected at their endpoints.
>
> HTH,
> Zoltan
>
> On 2022-05-02 10:49, Zoltan via Qgis-user wrote:
> > Sigh, this is where SHP-file hell comes in - it's the scourge of GIS.
> > Wouldn't it have been nice if your road network was in a data
> > structure that allows you to go to each point and ask it "how many
> > lines emanate from me"?
> >
> > Sorry, I know this is not helpful to you, but the SHP file format
> > needed to have died 20 years ago.
> >
> > Regards,
> > Zoltan
> >
> > On 2022-05-02 10:35, Roland Spielhofer via Qgis-user wrote:
> >> Hi,
> >> I have a road network (Shape linestring) where I would like to
> >> classify all links that are dead-end and compute the share of the
> >> dead-end links in relation to the total network length.
> >> I am pretty sure this is possible in QGIS or a plugin - any pointers
> >> would be appreciated.
> >> Regards,
> >> Roland
> >>
> >> _______________________________________________
> >> Qgis-user mailing list
> >> Qgis-user at lists.osgeo.org
> >> List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> >> Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
> >
> > --
> >
> > =============================================
> > Zoltan Szecsei GPrGISc 0031
> > Director, Geograph (Pty) Ltd.
> > GIS and Photogrammetric Services
> >
> > Cape Town, South Africa.
> >
> > Mobile: +27-83-6004028 (Signal, not WhatsApp)
> > www.geograph.co.za
> > =============================================
> >
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
>
> =============================================
> Zoltan Szecsei GPrGISc 0031
> Director, Geograph (Pty) Ltd.
> GIS and Photogrammetric Services
>
> Cape Town, South Africa.
>
> Mobile: +27-83-6004028 (Signal, not WhatsApp)
> www.geograph.co.za
> =============================================
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> ------------------------------
>
> Message: 5
> Date: Mon, 2 May 2022 11:05:27 +0200
> From: Roland Spielhofer <rspiel at gmx.net>
> To: zoltans at geograph.co.za
> Cc: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID:
>
> <trinity-a58b16b8-2d3c-4979-bad0-0727a64a1629-1651482327877 at 3c-app-gmx-bap40
> >
>
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> ------------------------------
>
> Message: 6
> Date: Mon, 2 May 2022 11:07:15 +0200
> From: Zoltan <zoltans at geograph.co.za>
> To: Roland Spielhofer <rspiel at gmx.net>
> Cc: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID: <8dd095da-9275-edab-abae-b592847983b0 at geograph.co.za>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> that's why SHP files need to die: They're too simple to use, so also get
> used by people less "in the know"
>
> On 2022-05-02 11:05, Roland Spielhofer wrote:
> > I totally agree with you, but the shape is all I got from the client -
> > nothing better is available at his side...
> > *Gesendet:*?Montag, 02. Mai 2022 um 10:49 Uhr
> > *Von:*?"Zoltan via Qgis-user" <qgis-user at lists.osgeo.org>
> > *An:* qgis-user at lists.osgeo.org
> > *Betreff:*?Re: [Qgis-user] Classify road network into dead-end links
> > and links connected on both ends
> > Sigh, this is where SHP-file hell comes in - it's the scourge of GIS.
> > Wouldn't it have been nice if your road network was in a data
> > structure that allows you to go to each point and ask it "how many
> > lines emanate from me"?
> >
> > Sorry, I know this is not helpful to you, but the SHP file format
> > needed to have died 20 years ago.
> >
> > Regards,
> > Zoltan
> > On 2022-05-02 10:35, Roland Spielhofer via Qgis-user wrote:
> >
> >     Hi,
> >     I have a road network (Shape linestring) where I would like to
> >     classify all links that are dead-end and compute the share of the
> >     dead-end links in relation to the total network length.
> >     I am pretty sure this is possible in QGIS or a plugin - any
> >     pointers would be appreciated.
> >     Regards,
> >     Roland
> >
> >     _______________________________________________
> >     Qgis-user mailing list
> >     Qgis-user at lists.osgeo.org
> >     List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> >     Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
> >
> > --
> >
> > =============================================
> > Zoltan Szecsei GPrGISc 0031
> > Director, Geograph (Pty) Ltd.
> > GIS and Photogrammetric Services
> >
> > Cape Town, South Africa.
> >
> > Mobile: +27-83-6004028 (Signal, not WhatsApp)
> > www.geograph.co.za
> > =============================================
> > _______________________________________________ Qgis-user mailing list
> > Qgis-user at lists.osgeo.org List info:
> > https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe:
> > https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
>
> =============================================
> Zoltan Szecsei GPrGISc 0031
> Director, Geograph (Pty) Ltd.
> GIS and Photogrammetric Services
>
> Cape Town, South Africa.
>
> Mobile: +27-83-6004028 (Signal, not WhatsApp)
> www.geograph.co.za
> =============================================
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> ------------------------------
>
> Message: 7
> Date: Mon, 2 May 2022 13:03:32 +0200
> From: Raymond Nijssen <r.nijssen at terglobo.nl>
> To: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID: <a3dbb9ee-2880-f7b6-6b10-3b6453793489 at terglobo.nl>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> Hi Roland,
>
> You could either go making SQL queries (using st_startpoint() and
> st_endpoint() et cetera) or have a look at the "Networks" plugin which
> has a lot of this kind of functionality.
>
> https://plugins.qgis.org/plugins/networks/
>
> And there are several other network and topology related plugins.
>
> Hope this helps,
> Raymond
>
>
> On 02-05-2022 10:35, Roland Spielhofer via Qgis-user wrote:
> > Hi,
> > I have a road network (Shape linestring) where I would like to classify
> > all links that are dead-end and compute the share of the dead-end links
> > in relation to the total network length.
> > I am pretty sure this is possible in QGIS or a plugin - any pointers
> > would be appreciated.
> > Regards,
> > Roland
> >
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
> ------------------------------
>
> Message: 8
> Date: Mon, 2 May 2022 10:47:27 -0400
> From: Nicolas Cadieux <njacadieux.gitlab at gmail.com>
> To: Roland Spielhofer <rspiel at gmx.net>
> Cc: qgis-user <qgis-user at lists.osgeo.org>
> Subject: Re: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID: <9B36425D-A0C6-42B0-A82A-57DD92AF1679 at gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
>
> Go to
> https://plugins.qgis.org/models/?order_by=-upload_date&&is_gallery=true
> and download the 3  ?fix directional networks? model.  I created this to
> troubleshoot river network file for people that needed perfectly connected
> network or graph files.  This video should help also
> https://youtu.be/v61PafSByvM.
>
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>
> > Le 2 mai 2022 ? 04:41, Roland Spielhofer via Qgis-user <
> qgis-user at lists.osgeo.org> a ?crit :
> >
> > ?
> > Hi,
> > I have a road network (Shape linestring) where I would like to classify
> all links that are dead-end and compute the share of the dead-end links in
> relation to the total network length.
> > I am pretty sure this is possible in QGIS or a plugin - any pointers
> would be appreciated.
> >
> > Regards,
> > Roland
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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> ------------------------------
>
> Message: 9
> Date: Mon, 2 May 2022 17:09:34 +0200
> From: Johannes Kr?ger (WhereGroup)  <johannes.kroeger at wheregroup.com>
> To: Zoltan <zoltans at geograph.co.za>, Roland Spielhofer
>         <rspiel at gmx.net>
> Cc: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Classify road network into dead-end links and
>         links connected on both ends
> Message-ID: <d4ebf237-d72e-bba9-4eaa-f2295b49ec11 at wheregroup.com>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> While I agree that Shapefiles are often not ideal, GeoPackage or any
> other fancy modern format would have the same issues. They have
> implicite topology (the spatial relationships of the geometries defines
> what is connected and what is not), not explicite topology.
>
> You should find tools to do this fairly easily but if your data is not
> have "perfect" "geometric topology" it might have some false negatives
> or positives. Going via GRASS tools might be the best approach. Or some
> routing tools that are based on those common kinds of data.
>
> Cheers, Hannes
>
> Am 02.05.22 um 11:07 schrieb Zoltan via Qgis-user:
> > that's why SHP files need to die: They're too simple to use, so also
> > get used by people less "in the know"
> >
> > On 2022-05-02 11:05, Roland Spielhofer wrote:
> >> I totally agree with you, but the shape is all I got from the client
> >> - nothing better is available at his side...
> >> *Gesendet:*?Montag, 02. Mai 2022 um 10:49 Uhr
> >> *Von:*?"Zoltan via Qgis-user" <qgis-user at lists.osgeo.org>
> >> *An:* qgis-user at lists.osgeo.org
> >> *Betreff:*?Re: [Qgis-user] Classify road network into dead-end links
> >> and links connected on both ends
> >> Sigh, this is where SHP-file hell comes in - it's the scourge of GIS.
> >> Wouldn't it have been nice if your road network was in a data
> >> structure that allows you to go to each point and ask it "how many
> >> lines emanate from me"?
> >>
> >> Sorry, I know this is not helpful to you, but the SHP file format
> >> needed to have died 20 years ago.
> >>
> >> Regards,
> >> Zoltan
> >> On 2022-05-02 10:35, Roland Spielhofer via Qgis-user wrote:
> >>
> >>     Hi,
> >>     I have a road network (Shape linestring) where I would like to
> >>     classify all links that are dead-end and compute the share of the
> >>     dead-end links in relation to the total network length.
> >>     I am pretty sure this is possible in QGIS or a plugin - any
> >>     pointers would be appreciated.
> >>     Regards,
> >>     Roland
> >>
> >>     _______________________________________________
> >>     Qgis-user mailing list
> >>     Qgis-user at lists.osgeo.org
> >>     List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> >>     Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
> >>
> >> --
> >>
> >> =============================================
> >> Zoltan Szecsei GPrGISc 0031
> >> Director, Geograph (Pty) Ltd.
> >> GIS and Photogrammetric Services
> >>
> >> Cape Town, South Africa.
> >>
> >> Mobile: +27-83-6004028 (Signal, not WhatsApp)
> >> www.geograph.co.za
> >> =============================================
> >> _______________________________________________ Qgis-user mailing
> >> list Qgis-user at lists.osgeo.org List info:
> >> https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe:
> >> https://lists.osgeo.org/mailman/listinfo/qgis-user
> >
> > --
> >
> > =============================================
> > Zoltan Szecsei GPrGISc 0031
> > Director, Geograph (Pty) Ltd.
> > GIS and Photogrammetric Services
> >
> > Cape Town, South Africa.
> >
> > Mobile: +27-83-6004028 (Signal, not WhatsApp)
> > www.geograph.co.za
> > =============================================
> >
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > List info:https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe:https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
> Johannes Kr?ger / GIS-Entwickler/-Berater
>
> ---------------------------------------------
> Schon gewusst??
> In unserem Blog geben wir Tipps & Tricks zu Open-Source-GIS-Software
> und berichten aus unserem Experten-Alltag:
> https://wheregroup.com/blog/
> ---------------------------------------------
>
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> Grevenweg 89
> 20537 Hamburg
> Germany
>
> Tel: +49 (0)228 / 90 90 38 - 36
> Fax: +49 (0)228 / 90 90 38 - 11
>
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> End of Qgis-user Digest, Vol 195, Issue 1
> *****************************************
>


-- 
*Arjun Dongre*

Western EcoSystems Technology, Inc.
Environmental & Statistical Consultants
415 W. 17th St. Suite 200
Cheyenne, WY 82001
adongre at west-inc.com
www.west-inc.com

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