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Creating centerline of river in QGIS? [duplicate]

Finding centrelines from polygons in QGIS?Finding centre line of irregular polygons with QGIS?“Average” of two linesSplitting line into two lines with GRASS GIS?Centroid of the equator and a pointpostgis: problems creating flow direction polyline; not all needed connections are drawnhow to make decent sense from scattered river depth measurementsQGIS Interpolation on Curved Grid (River DEMs)How to create automatic parking baysShortest path creation between two linesclipping layer using query builder in QGISFinding which side of closest polyline point lies on in QGIS?Create centerline from multi-digitized roadway lines Qgis 2.18Getting bathymetric contours confined only within river banks using QGIS?

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7

4

This question already has an answer here:

• 
  Finding centrelines from polygons in QGIS?
  
  4 answers
  
  

I made two river bank lines and I want to associate them.

I want to make a centerline using two rows as a base. I managed to make the centre line with a lot of work creating several lines from one margin to the other of the river and then using the centroid, but this solution is very tiring and I have to do this in several areas.

qgis line centroids

share|improve this question

edited Apr 14 at 12:05

Taras

2,7773830

asked Apr 14 at 1:01

wallace camelowallace camelo

361

marked as duplicate by Jochen Schwarze, whyzar, ArMoraer, Simbamangu, Erik Apr 17 at 8:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I think after 6 years a new question is legit and answers provided are not up to date for version 3
  
  – MrXsquared
  Apr 16 at 20:49
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, but this question als is 5 years old.
  
  – Erik
  Apr 17 at 8:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Erik it was asked 3 days ago (2019-04-14)
  
  – MrXsquared
  Apr 17 at 13:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, I thought April 14 = April 2014 -.-
  
  – Erik
  Apr 17 at 15:18
  

  
  
  
  

add a comment | 

7

4

This question already has an answer here:

• 
  Finding centrelines from polygons in QGIS?
  
  4 answers
  
  

I made two river bank lines and I want to associate them.

I want to make a centerline using two rows as a base. I managed to make the centre line with a lot of work creating several lines from one margin to the other of the river and then using the centroid, but this solution is very tiring and I have to do this in several areas.

qgis line centroids

share|improve this question

edited Apr 14 at 12:05

Taras

2,7773830

asked Apr 14 at 1:01

wallace camelowallace camelo

361

marked as duplicate by Jochen Schwarze, whyzar, ArMoraer, Simbamangu, Erik Apr 17 at 8:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I think after 6 years a new question is legit and answers provided are not up to date for version 3
  
  – MrXsquared
  Apr 16 at 20:49
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, but this question als is 5 years old.
  
  – Erik
  Apr 17 at 8:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Erik it was asked 3 days ago (2019-04-14)
  
  – MrXsquared
  Apr 17 at 13:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, I thought April 14 = April 2014 -.-
  
  – Erik
  Apr 17 at 15:18
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Finding centrelines from polygons in QGIS?
  
  4 answers
  
  

I made two river bank lines and I want to associate them.

I want to make a centerline using two rows as a base. I managed to make the centre line with a lot of work creating several lines from one margin to the other of the river and then using the centroid, but this solution is very tiring and I have to do this in several areas.

qgis line centroids

share|improve this question

edited Apr 14 at 12:05

Taras

2,7773830

asked Apr 14 at 1:01

wallace camelowallace camelo

361

share|improve this question

edited Apr 14 at 12:05

Taras

2,7773830

asked Apr 14 at 1:01

wallace camelowallace camelo

361

share|improve this question

edited Apr 14 at 12:05

Taras

2,7773830

asked Apr 14 at 1:01

wallace camelowallace camelo

361

edited Apr 14 at 12:05

Taras

2,7773830

edited Apr 14 at 12:05

Taras

2,7773830

asked Apr 14 at 1:01

wallace camelowallace camelo

361

asked Apr 14 at 1:01

wallace camelowallace camelo

361

3 Answers
3

active

oldest

votes

6

The surest method for solving your question from the point of view of the cartographic approach is to use the Voronoi Polygons.

I offer one of the solutions to your question using QGIS tools.

So, the initial data is a river as an areal object, see the figure below.

2) Vector > Geometry processing > Convert polygons into lines, see image below

3) Open the closed line QGIS "Split Features" tool and run the GRASS v.split tool, so that the points are evenly distributed along the line and run the Vector> Geometry Processing> Voronoi Polygons tool on them, see the figure below

or run the plugin with the name in the screenshot below, which is more convenient ...

4) Cut the original Voronoi polygons from the result with Vector > Geoprocessing > Trim and then select only one half of the river area, see the picture below using the Ctrl key and the selection tool more
Vector > Geoprocessing > Merge by grounds ... > By all indications.

5) Cut from the source layer the result of the selected left or the right area, see the picture below.

6) Then from the result of cutting create a line, blow it up, remove unnecessary parts and leave the centre line of the river, see figure below

This is the main approach to solving your question and it is clear that a variety of tools allows you to solve your question in various ways, but the idea remains the same, good luck ...

share|improve this answer

edited May 14 at 16:46

answered Apr 14 at 9:47

CyrilCyril

1,3411418

add a comment | 

3

Try the GRASS algorithm v.centerline. You may have to tweak around with the parameters, but as long as your river polygons are longer than they are wide it should work for a large portion of your inputs.

share|improve this answer

answered Apr 14 at 11:44

wfgeowfgeo

1,693520

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Can you explain how to use it in QGIS?
  
  – MrXsquared
  Apr 14 at 14:21
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MrXsquared I am actually now surprised to find that this tool is not accessible from the Geoprocessing toolbox, so I guess my answer is not that appropriate to the question.
  
  – wfgeo
  Apr 14 at 14:45
  

  
  
  
  

add a comment | 

1

The HCMGIS plugin says it does this:

Spatial Processing: Create Skeleton/Medial Axis/ Centerline for road/ river networks and similar linear structures

share|improve this answer

answered Apr 15 at 17:30

cskcsk

11.4k1337

add a comment | 

6

The surest method for solving your question from the point of view of the cartographic approach is to use the Voronoi Polygons.

I offer one of the solutions to your question using QGIS tools.

So, the initial data is a river as an areal object, see the figure below.

2) Vector > Geometry processing > Convert polygons into lines, see image below

3) Open the closed line QGIS "Split Features" tool and run the GRASS v.split tool, so that the points are evenly distributed along the line and run the Vector> Geometry Processing> Voronoi Polygons tool on them, see the figure below

or run the plugin with the name in the screenshot below, which is more convenient ...

4) Cut the original Voronoi polygons from the result with Vector > Geoprocessing > Trim and then select only one half of the river area, see the picture below using the Ctrl key and the selection tool more
Vector > Geoprocessing > Merge by grounds ... > By all indications.

5) Cut from the source layer the result of the selected left or the right area, see the picture below.

6) Then from the result of cutting create a line, blow it up, remove unnecessary parts and leave the centre line of the river, see figure below

This is the main approach to solving your question and it is clear that a variety of tools allows you to solve your question in various ways, but the idea remains the same, good luck ...

share|improve this answer

edited May 14 at 16:46

answered Apr 14 at 9:47

CyrilCyril

1,3411418

add a comment | 

6

The surest method for solving your question from the point of view of the cartographic approach is to use the Voronoi Polygons.

I offer one of the solutions to your question using QGIS tools.

So, the initial data is a river as an areal object, see the figure below.

2) Vector > Geometry processing > Convert polygons into lines, see image below

3) Open the closed line QGIS "Split Features" tool and run the GRASS v.split tool, so that the points are evenly distributed along the line and run the Vector> Geometry Processing> Voronoi Polygons tool on them, see the figure below

or run the plugin with the name in the screenshot below, which is more convenient ...

4) Cut the original Voronoi polygons from the result with Vector > Geoprocessing > Trim and then select only one half of the river area, see the picture below using the Ctrl key and the selection tool more
Vector > Geoprocessing > Merge by grounds ... > By all indications.

5) Cut from the source layer the result of the selected left or the right area, see the picture below.

6) Then from the result of cutting create a line, blow it up, remove unnecessary parts and leave the centre line of the river, see figure below

This is the main approach to solving your question and it is clear that a variety of tools allows you to solve your question in various ways, but the idea remains the same, good luck ...

share|improve this answer

edited May 14 at 16:46

answered Apr 14 at 9:47

CyrilCyril

1,3411418

add a comment | 

The surest method for solving your question from the point of view of the cartographic approach is to use the Voronoi Polygons.

I offer one of the solutions to your question using QGIS tools.

So, the initial data is a river as an areal object, see the figure below.

2) Vector > Geometry processing > Convert polygons into lines, see image below

3) Open the closed line QGIS "Split Features" tool and run the GRASS v.split tool, so that the points are evenly distributed along the line and run the Vector> Geometry Processing> Voronoi Polygons tool on them, see the figure below

or run the plugin with the name in the screenshot below, which is more convenient ...

4) Cut the original Voronoi polygons from the result with Vector > Geoprocessing > Trim and then select only one half of the river area, see the picture below using the Ctrl key and the selection tool more
Vector > Geoprocessing > Merge by grounds ... > By all indications.

5) Cut from the source layer the result of the selected left or the right area, see the picture below.

6) Then from the result of cutting create a line, blow it up, remove unnecessary parts and leave the centre line of the river, see figure below

This is the main approach to solving your question and it is clear that a variety of tools allows you to solve your question in various ways, but the idea remains the same, good luck ...

share|improve this answer

edited May 14 at 16:46

answered Apr 14 at 9:47

CyrilCyril

1,3411418

share|improve this answer

edited May 14 at 16:46

answered Apr 14 at 9:47

CyrilCyril

1,3411418

answered Apr 14 at 9:47

CyrilCyril

1,3411418

answered Apr 14 at 9:47

CyrilCyril

1,3411418

3

Try the GRASS algorithm v.centerline. You may have to tweak around with the parameters, but as long as your river polygons are longer than they are wide it should work for a large portion of your inputs.

share|improve this answer

answered Apr 14 at 11:44

wfgeowfgeo

1,693520

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Can you explain how to use it in QGIS?
  
  – MrXsquared
  Apr 14 at 14:21
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MrXsquared I am actually now surprised to find that this tool is not accessible from the Geoprocessing toolbox, so I guess my answer is not that appropriate to the question.
  
  – wfgeo
  Apr 14 at 14:45
  

  
  
  
  

add a comment | 

3

Try the GRASS algorithm v.centerline. You may have to tweak around with the parameters, but as long as your river polygons are longer than they are wide it should work for a large portion of your inputs.

share|improve this answer

answered Apr 14 at 11:44

wfgeowfgeo

1,693520

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Can you explain how to use it in QGIS?
  
  – MrXsquared
  Apr 14 at 14:21
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MrXsquared I am actually now surprised to find that this tool is not accessible from the Geoprocessing toolbox, so I guess my answer is not that appropriate to the question.
  
  – wfgeo
  Apr 14 at 14:45
  

  
  
  
  

add a comment | 

Try the GRASS algorithm v.centerline. You may have to tweak around with the parameters, but as long as your river polygons are longer than they are wide it should work for a large portion of your inputs.

share|improve this answer

answered Apr 14 at 11:44

wfgeowfgeo

1,693520

share|improve this answer

answered Apr 14 at 11:44

wfgeowfgeo

1,693520

answered Apr 14 at 11:44

wfgeowfgeo

1,693520

answered Apr 14 at 11:44

wfgeowfgeo

1,693520

1

The HCMGIS plugin says it does this:

Spatial Processing: Create Skeleton/Medial Axis/ Centerline for road/ river networks and similar linear structures

share|improve this answer

answered Apr 15 at 17:30

cskcsk

11.4k1337

add a comment | 

1

The HCMGIS plugin says it does this:

Spatial Processing: Create Skeleton/Medial Axis/ Centerline for road/ river networks and similar linear structures

share|improve this answer

answered Apr 15 at 17:30

cskcsk

11.4k1337

add a comment | 

The HCMGIS plugin says it does this:

Spatial Processing: Create Skeleton/Medial Axis/ Centerline for road/ river networks and similar linear structures

share|improve this answer

answered Apr 15 at 17:30

cskcsk

11.4k1337

share|improve this answer

answered Apr 15 at 17:30

cskcsk

11.4k1337

answered Apr 15 at 17:30

cskcsk

11.4k1337

answered Apr 15 at 17:30

cskcsk

11.4k1337