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Constrained Voronoi polygons QGIS
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I have a shapefile of polygons, which are effectively borders of a geographic unit (consider as an example the 50 u.s. states, each state has within it some number of points.).
I'd like to create Voronoi polygons from the points, with the caveat that the state borders effectively constrain the Voronoi polygons created from the points within that state.
The labor-intensive way to do this would be to create 50 individual shapefiles for each state, create Voronoi polygons within each, then manually merge them back together.
Is there an easier way to do this, ideally in QGIS (am using 2.18 on Mac)?
qgis polygon voronoi-thiessen
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
asked Sep 3 '18 at 21:26
StevenSteven
311
bumped to the homepage by Community♦ 2 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have a shapefile of polygons, which are effectively borders of a geographic unit (consider as an example the 50 u.s. states, each state has within it some number of points.).
I'd like to create Voronoi polygons from the points, with the caveat that the state borders effectively constrain the Voronoi polygons created from the points within that state.
The labor-intensive way to do this would be to create 50 individual shapefiles for each state, create Voronoi polygons within each, then manually merge them back together.
Is there an easier way to do this, ideally in QGIS (am using 2.18 on Mac)?
qgis polygon voronoi-thiessen
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
asked Sep 3 '18 at 21:26
StevenSteven
311
bumped to the homepage by Community♦ 2 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
1
Why not create Voronoi polygons for the entire point layer, then intersect the result with the geographic boundary layer?
– csk
Sep 4 '18 at 2:43
Just to clarify can one state have many points?
– firefly-orange
Sep 4 '18 at 9:37
add a comment |
I have a shapefile of polygons, which are effectively borders of a geographic unit (consider as an example the 50 u.s. states, each state has within it some number of points.).
I'd like to create Voronoi polygons from the points, with the caveat that the state borders effectively constrain the Voronoi polygons created from the points within that state.
The labor-intensive way to do this would be to create 50 individual shapefiles for each state, create Voronoi polygons within each, then manually merge them back together.
Is there an easier way to do this, ideally in QGIS (am using 2.18 on Mac)?
qgis polygon voronoi-thiessen
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
asked Sep 3 '18 at 21:26
StevenSteven
311
I have a shapefile of polygons, which are effectively borders of a geographic unit (consider as an example the 50 u.s. states, each state has within it some number of points.).
I'd like to create Voronoi polygons from the points, with the caveat that the state borders effectively constrain the Voronoi polygons created from the points within that state.
The labor-intensive way to do this would be to create 50 individual shapefiles for each state, create Voronoi polygons within each, then manually merge them back together.
Is there an easier way to do this, ideally in QGIS (am using 2.18 on Mac)?
qgis polygon voronoi-thiessen
qgis polygon voronoi-thiessen
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
asked Sep 3 '18 at 21:26
StevenSteven
311
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
asked Sep 3 '18 at 21:26
StevenSteven
311
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
edited Sep 4 '18 at 2:20
Kirk Kuykendall
21.7k657144
21.7k657144
asked Sep 3 '18 at 21:26
StevenSteven
311
asked Sep 3 '18 at 21:26
StevenSteven
311
asked Sep 3 '18 at 21:26
StevenSteven
311
311
bumped to the homepage by Community♦ 2 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 2 hours ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
1
Why not create Voronoi polygons for the entire point layer, then intersect the result with the geographic boundary layer?
– csk
Sep 4 '18 at 2:43
Just to clarify can one state have many points?
– firefly-orange
Sep 4 '18 at 9:37
add a comment |
1
Why not create Voronoi polygons for the entire point layer, then intersect the result with the geographic boundary layer?
– csk
Sep 4 '18 at 2:43
Just to clarify can one state have many points?
– firefly-orange
Sep 4 '18 at 9:37
1
1
Why not create Voronoi polygons for the entire point layer, then intersect the result with the geographic boundary layer?
– csk
Sep 4 '18 at 2:43
Why not create Voronoi polygons for the entire point layer, then intersect the result with the geographic boundary layer?
– csk
Sep 4 '18 at 2:43
Just to clarify can one state have many points?
– firefly-orange
Sep 4 '18 at 9:37
Just to clarify can one state have many points?
– firefly-orange
Sep 4 '18 at 9:37
add a comment |
1 Answer
1
active
oldest
votes
Similarly to the answer that @csk gave you you could try this two alternatives:
1- Include Nodes of state polygons into Voronoi tool.
- Nodes from States layer (Use Extract nodes).
- Merge points and Nodes.
- Voronoi tool with Points and Nodes.
Last step is to clip your Voronoi pols with States layer (if you need it).
2- Use Voronoi directly over Point layer using buffer to "expand" these to full State extension.
- Clip with State layer.
As you see you will get different results. It depends on what are you looking for.
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
add a comment |
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Similarly to the answer that @csk gave you you could try this two alternatives:
1- Include Nodes of state polygons into Voronoi tool.
- Nodes from States layer (Use Extract nodes).
- Merge points and Nodes.
- Voronoi tool with Points and Nodes.
Last step is to clip your Voronoi pols with States layer (if you need it).
2- Use Voronoi directly over Point layer using buffer to "expand" these to full State extension.
- Clip with State layer.
As you see you will get different results. It depends on what are you looking for.
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
add a comment |
Similarly to the answer that @csk gave you you could try this two alternatives:
1- Include Nodes of state polygons into Voronoi tool.
- Nodes from States layer (Use Extract nodes).
- Merge points and Nodes.
- Voronoi tool with Points and Nodes.
Last step is to clip your Voronoi pols with States layer (if you need it).
2- Use Voronoi directly over Point layer using buffer to "expand" these to full State extension.
- Clip with State layer.
As you see you will get different results. It depends on what are you looking for.
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
add a comment |
Similarly to the answer that @csk gave you you could try this two alternatives:
1- Include Nodes of state polygons into Voronoi tool.
- Nodes from States layer (Use Extract nodes).
- Merge points and Nodes.
- Voronoi tool with Points and Nodes.
Last step is to clip your Voronoi pols with States layer (if you need it).
2- Use Voronoi directly over Point layer using buffer to "expand" these to full State extension.
- Clip with State layer.
As you see you will get different results. It depends on what are you looking for.
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
Similarly to the answer that @csk gave you you could try this two alternatives:
1- Include Nodes of state polygons into Voronoi tool.
- Nodes from States layer (Use Extract nodes).
- Merge points and Nodes.
- Voronoi tool with Points and Nodes.
Last step is to clip your Voronoi pols with States layer (if you need it).
2- Use Voronoi directly over Point layer using buffer to "expand" these to full State extension.
- Clip with State layer.
As you see you will get different results. It depends on what are you looking for.
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
answered Sep 24 '18 at 11:20
César ArqueroCésar Arquero
869524
869524
add a comment |
add a comment |
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1
Why not create Voronoi polygons for the entire point layer, then intersect the result with the geographic boundary layer?
– csk
Sep 4 '18 at 2:43
Just to clarify can one state have many points?
– firefly-orange
Sep 4 '18 at 9:37