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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?



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








6















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



Example_1



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.



Example_2










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  • Possible duplicate of Finding centrelines from polygons in QGIS?

    – TomazicM
    20 hours ago

















6















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



Example_1



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.



Example_2










share|improve this question









New contributor




wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • Possible duplicate of Finding centrelines from polygons in QGIS?

    – TomazicM
    20 hours ago













6












6








6


2






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



Example_1



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.



Example_2










share|improve this question









New contributor




wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












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



Example_1



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.



Example_2







qgis line centroids






share|improve this question









New contributor




wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 17 hours ago









Taras

2,3003729




2,3003729






New contributor




wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked yesterday









wallace camelowallace camelo

311




311




New contributor




wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






wallace camelo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • 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





Possible duplicate of Finding centrelines from polygons in QGIS?

– TomazicM
20 hours ago










2 Answers
2






active

oldest

votes


















3














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.
enter image description here



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



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



enter image description here



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 enter image description here more
Vector> Geoprocessing> Association by Basis> By all indications.



enter image description here



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



enter image description here



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
enter image description here



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
































    1














    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























    • 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











    Your Answer








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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    3














    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.
    enter image description here



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



    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



    enter image description here



    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 enter image description here more
    Vector> Geoprocessing> Association by Basis> By all indications.



    enter image description here



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



    enter image description here



    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
    enter image description here



    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





























      3














      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.
      enter image description here



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



      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



      enter image description here



      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 enter image description here more
      Vector> Geoprocessing> Association by Basis> By all indications.



      enter image description here



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



      enter image description here



      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
      enter image description here



      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



























        3












        3








        3







        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.
        enter image description here



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



        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



        enter image description here



        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 enter image description here more
        Vector> Geoprocessing> Association by Basis> By all indications.



        enter image description here



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



        enter image description here



        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
        enter image description here



        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















        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.
        enter image description here



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



        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



        enter image description here



        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 enter image description here more
        Vector> Geoprocessing> Association by Basis> By all indications.



        enter image description here



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



        enter image description here



        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
        enter image description here



        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














        share|improve this answer



        share|improve this answer








        edited 18 hours ago

























        answered 20 hours ago









        CyrilCyril

        1,1521216




        1,1521216























            1














            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























            • 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















            1














            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























            • 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













            1












            1








            1







            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













            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












            share|improve this answer



            share|improve this answer










            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

















            • 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










            wallace camelo is a new contributor. Be nice, and check out our Code of Conduct.









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