Linked Questions

16 votes
3 answers
24k views

Creating centerline of river in QGIS? [duplicate]

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 ...
wallace camelo's user avatar
1 vote
0 answers
223 views

Creating Centrelines from Road Polygons using QGIS? [duplicate]

I want to create center lines from road polygons. Are there any automated tools in QGIS to do this? I am including a Screenshot of my vector file below.
Jessica's user avatar
  • 11
0 votes
0 answers
178 views

Is it possible to "re-buffer" river polygon dataset? [duplicate]

I've river polygon data representing the water quality. This polygon data were derived from polyline dataset according to a buffer distance in the attribute table. Unfortunately I don't have this line ...
parallax's user avatar
  • 1,482
0 votes
0 answers
84 views

How to extract road centreline from delaunay triangulation using open source QGIS? [duplicate]

From some months I have been solving a problem but I cannot finish. My question is, "How can I extract a road centreline from delaunay triangulation using open-source QGIS?" Actually, I am using ...
user avatar
1 vote
0 answers
76 views

How to get centerline of each polygon (rectangles) in QGIS [duplicate]

How to get centerline of each polygon (rectangles) as in Figure 1 in QGIS to obtain centerlines as in Figure 2 Figure 1 Figure 2
HansrajR's user avatar
  • 537
32 votes
6 answers
46k views

Creating Centrelines from Road Polygons/Casings using ArcGIS Desktop?

I want to create center lines from road polygons. Are there any automated tools in ArcGIS for Desktop to do this? I am including a Screenshot of my vector file below.
Binoy's user avatar
  • 767
18 votes
2 answers
15k views

Is it possible to create Thiessen polygons around nodes in QGIS?

Is it possible to create Thiessen polygons around nodes in QGIS? e.g. http://en.wikipedia.org/wiki/Voronoi_diagram
Robertg's user avatar
  • 467
11 votes
5 answers
18k views

Is it possible to convert Polygon to centerline linestring?

I have a Polygon which I want to convert to centerline linestring. IMAGE 1 I used the Vector to convert to Polyline but they are not center line as under: VECTOR TOOL IMAGE 2 Polyline created by ...
Duffer's user avatar
  • 463
6 votes
2 answers
7k views

Create a center line between 2 polyline - QGIS [duplicate]

I want to create a center line for a river (polygon). I thought about simply creating a new line manually, but it would be a long and imperfect process. If there is a way to automate this process, ...
Rashomon's user avatar
  • 323
6 votes
1 answer
3k views

Creating centerline of polygon using PostGIS?

I am aware of Finding centrelines from polygons in QGIS? but I am looking for another Open Source GIS way to do this. Is there a possibility to create centerlines in PostGIS? I have this shapefile (...
Tomáš Kudela's user avatar
5 votes
1 answer
2k views

Creating middle line between two lines in QGIS

I'm looking for a way or tool in QGIS that could create a mean line between two line features, from a line shapefile (not a polygon). See sketch image below for clarification.
Aurora's user avatar
  • 163
3 votes
2 answers
2k views

Creating buffer (of line geometry) around polygon feature using QGIS

I have a polygon layer representing coastal cliffs and would like to create a line at a certain distance out to sea from this polygon layer (I drew a blue line on the image below to demonstrate). In ...
Simba06's user avatar
  • 861
8 votes
1 answer
517 views

Opening old QGIS model in current QGIS versions

There is an older answer by @underdark to this post: Finding centrelines from polygons in QGIS? She links a QGIS model that apparently was created in QGIS 2.12. It has the file extension .model When I ...
Babel's user avatar
  • 74.9k
4 votes
1 answer
2k views

Find out if overlaying polyline matches polygon centerline in qgis

I have a polygon and a polyline and I need to find a scientific way of how close that polyline is to the actual polygon centerline. Is there any way of doing this in qgis? Any extensions, models, ...
Revo's user avatar
  • 637
8 votes
2 answers
741 views

Generating non-merging buffers in QGIS

I'm using QGIS to construct some fixed width buffers from a coastline shapefile. Is there a way to easily handle overlaps/ median lines? (I'm not sure if there's a particular term or phrase I should ...
Andy Harvey's user avatar

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