[GRASS-user] Equidistant points along lines of a vector network (Johannes Radinger)

GRASS GRASS user
1

Hi Johannes,

one way might be using v.to.points and setting dmax=250 (so that the points are at most 250m apart):

v.to.points -vi input=river output=river_pt250m dmax=250

Regards,
Pedro

···

2014-09-23 20:00 GMT+01:00 <grass-user-request@lists.osgeo.org>:

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Today’s Topics:

  1. Equidistant points along lines of a vector network
    (Johannes Radinger)
  2. Re: Equidistant points along lines of a vector network
    (Moritz Lennert)
  3. Re: problem to install grass70 on ubuntu 12.04 (Markus Neteler)
  4. Re: Equidistant points along lines of a vector network
    (C?sar Augusto Ram?rez Franco)

Message: 1
Date: Tue, 23 Sep 2014 10:23:58 +0200
From: Johannes Radinger <
​​
johannesradinger@gmail.com>
To: GRASS user list <grass-user@lists.osgeo.org>
Subject: [GRASS-user] Equidistant points along lines of a vector
network
Message-ID:
<CABsGe_w67ovb=3Y+REmQoptCb5YVwoUbW4DVy5cbOgF1p2MaLQ@mail.gmail.com>
Content-Type: text/plain; charset=“utf-8”

Hi,

I’ve got a vector network (river network) and I want to place points
along that network. The points should be placed every 250 m starting
from the outlet. Any network junctions should be ignored so that every
point is 250 apart from the next upstream and downstream point.

With the tool v.segment only the single parts of the polyline (lines between
nodes) are splitted based on the distance parameter. So v.segment ignores
the network. Maybe v.net.iso can be of use in this case, but here I am
missing
the option to create points in given distance classes from a starting point.

Is there any specific GRASS tool or procedure for such tasks?
Any suggestions?

Best regards,
Johannes
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Message: 2
Date: Tue, 23 Sep 2014 14:39:51 +0200
From: Moritz Lennert <mlennert@club.worldonline.be>
To: Johannes Radinger <johannesradinger@gmail.com>, GRASS user list
<grass-user@lists.osgeo.org>
Subject: Re: [GRASS-user] Equidistant points along lines of a vector
network
Message-ID: <54216A17.2030507@club.worldonline.be>
Content-Type: text/plain; charset=windows-1252; format=flowed

On 23/09/14 10:23, Johannes Radinger wrote:

Hi,

I’ve got a vector network (river network) and I want to place points
along that network. The points should be placed every 250 m starting
from the outlet. Any network junctions should be ignored so that every
point is 250 apart from the next upstream and downstream point.

With the tool v.segment only the single parts of the polyline (lines between
nodes) are splitted based on the distance parameter. So v.segment ignores
the network. Maybe v.net.iso can be of use in this case, but here I am
missing
the option to create points in given distance classes from a starting point.

Is there any specific GRASS tool or procedure for such tasks?

Would v.build.polylines help here ? I don’t know how v.segment acts on
polylines.

Moritz

Message: 3
Date: Tue, 23 Sep 2014 16:51:25 +0200
From: Markus Neteler <neteler@osgeo.org>
To: Rashad M <mohammedrashadkm@gmail.com>
Cc: GRASS user list <grass-user@lists.osgeo.org>, Mohammed Rashad
<rashadkm@gmail.com>, “tech@wildintellect.com”
<tech@wildintellect.com>
Subject: Re: [GRASS-user] problem to install grass70 on ubuntu 12.04
Message-ID:
<CALFmHhtp7=8F=4S0O+T9yOeaOaNM6SKw0kHctey2MNjtXCoeNw@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

Hi,

just FYI - the person who asked for my assistance with Ubuntu, got it
running after these two steps (as not being an Ubuntu user I don’t
know what it means):

software-properties-gtk
sudo apt-get update

Once these two steps made, the GRASS packages appeared in the Software
Center under GRASS Packages stable series.

… thought to post that here, maybe useful.

Markus

Message: 4
Date: Tue, 23 Sep 2014 13:44:25 -0500
From: C?sar Augusto Ram?rez Franco <caesarivs@gmail.com>
To: Moritz Lennert <mlennert@club.worldonline.be>
Cc: GRASS user list <grass-user@lists.osgeo.org>, Johannes Radinger
<johannesradinger@gmail.com>
Subject: Re: [GRASS-user] Equidistant points along lines of a vector
network
Message-ID:
<CAJDYei=crCUSQKKHsans8TLXYEewZemZ5AU_c2HC22N5RL8ELA@mail.gmail.com>
Content-Type: text/plain; charset=“utf-8”

Have you tried v.points module?

2014-09-23 7:39 GMT-05:00 Moritz Lennert <mlennert@club.worldonline.be>:

On 23/09/14 10:23, Johannes Radinger wrote:

Hi,

I’ve got a vector network (river network) and I want to place points
along that network. The points should be placed every 250 m starting
from the outlet. Any network junctions should be ignored so that every
point is 250 apart from the next upstream and downstream point.

With the tool v.segment only the single parts of the polyline (lines
between
nodes) are splitted based on the distance parameter. So v.segment ignores
the network. Maybe v.net.iso can be of use in this case, but here I am
missing
the option to create points in given distance classes from a starting
point.

Is there any specific GRASS tool or procedure for such tasks?

Would v.build.polylines help here ? I don’t know how v.segment acts on
polylines.

Moritz

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–
C?sar Augusto Ram?rez Franco
Laboratorio de Sistemas Complejos Naturales
Escuela de Geociencias
Facultad de Ciencias
Universidad Nacional de Colombia - Sede Medell?n
Tel?fono: (57-4) 430 9369 - 300 459 6085
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