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Creating centerline of river in QGIS?
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?Finding centrelines from polygons in QGIS?Splitting 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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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
New contributor
add a comment |
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
New contributor
Possible duplicate of Finding centrelines from polygons in QGIS?
– TomazicM
20 hours ago
add a comment |
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
New contributor
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
qgis line centroids
New contributor
New contributor
edited 17 hours ago
Taras
2,3003729
2,3003729
New contributor
asked yesterday
wallace camelowallace camelo
311
311
New contributor
New contributor
Possible duplicate of Finding centrelines from polygons in QGIS?
– TomazicM
20 hours ago
add a comment |
Possible duplicate of Finding centrelines from polygons in QGIS?
– TomazicM
20 hours ago
Possible duplicate of Finding centrelines from polygons in QGIS?
– TomazicM
20 hours ago
Possible duplicate of Finding centrelines from polygons in QGIS?
– TomazicM
20 hours ago
add a comment |
2 Answers
2
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The surest method for solving your question from the point of view of the cartographic approach is to use the Voronovo 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
4) Cut the original Voronovy 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> Association by Basis> 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 center 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 ...
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.
Can you explain how to use it in QGIS?
– MrXsquared
15 hours ago
@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
15 hours ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
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oldest
votes
The surest method for solving your question from the point of view of the cartographic approach is to use the Voronovo 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
4) Cut the original Voronovy 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> Association by Basis> 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 center 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 ...
add a comment |
The surest method for solving your question from the point of view of the cartographic approach is to use the Voronovo 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
4) Cut the original Voronovy 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> Association by Basis> 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 center 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 ...
add a comment |
The surest method for solving your question from the point of view of the cartographic approach is to use the Voronovo 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
4) Cut the original Voronovy 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> Association by Basis> 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 center 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 ...
The surest method for solving your question from the point of view of the cartographic approach is to use the Voronovo 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
4) Cut the original Voronovy 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> Association by Basis> 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 center 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 ...
edited 18 hours ago
answered 20 hours ago
CyrilCyril
1,1521216
1,1521216
add a comment |
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.
Can you explain how to use it in QGIS?
– MrXsquared
15 hours ago
@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
15 hours ago
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.
Can you explain how to use it in QGIS?
– MrXsquared
15 hours ago
@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
15 hours ago
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.
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.
answered 18 hours ago
wfgeowfgeo
1,553518
1,553518
Can you explain how to use it in QGIS?
– MrXsquared
15 hours ago
@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
15 hours ago
add a comment |
Can you explain how to use it in QGIS?
– MrXsquared
15 hours ago
@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
15 hours ago
Can you explain how to use it in QGIS?
– MrXsquared
15 hours ago
Can you explain how to use it in QGIS?
– MrXsquared
15 hours ago
@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
15 hours ago
@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
15 hours ago
add a comment |
wallace camelo is a new contributor. Be nice, and check out our Code of Conduct.
wallace camelo is a new contributor. Be nice, and check out our Code of Conduct.
wallace camelo is a new contributor. Be nice, and check out our Code of Conduct.
wallace camelo is a new contributor. Be nice, and check out our Code of Conduct.
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-centroids, line, qgis
Possible duplicate of Finding centrelines from polygons in QGIS?
– TomazicM
20 hours ago