How do you split a circle polygon into equal quadrants in QGIS?

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How do you split a circle polygon into equal sectors that are 5 degrees in width in QGIS? I have shapefile from a boundary of a field and want to break it into sectors. enter image description here

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Chad Godsey

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By definition, a quadrant is 1/4 of a circle. I wonder if you meant quadrat, which Wikipedia defines as "a frame, traditionally square, used in ecology and geography to isolate a standard unit of area for study of the distribution of an item over a large area." If so, you should keep in mind that, "modern quadrats can for example be rectangular, circular, or irregular." Please edit your question to clarify how you want to divide up your circle. An image showing the desired output would be helpful.
â€“Â csk
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up vote
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How do you split a circle polygon into equal sectors that are 5 degrees in width in QGIS? I have shapefile from a boundary of a field and want to break it into sectors. enter image description here

edited 2 hours ago

asked 4 hours ago

Chad Godsey

112

New contributor

1

By definition, a quadrant is 1/4 of a circle. I wonder if you meant quadrat, which Wikipedia defines as "a frame, traditionally square, used in ecology and geography to isolate a standard unit of area for study of the distribution of an item over a large area." If so, you should keep in mind that, "modern quadrats can for example be rectangular, circular, or irregular." Please edit your question to clarify how you want to divide up your circle. An image showing the desired output would be helpful.
â€“Â csk
3 hours ago

add a commentÂ |Â

up vote
2
down vote

favorite

How do you split a circle polygon into equal sectors that are 5 degrees in width in QGIS? I have shapefile from a boundary of a field and want to break it into sectors. enter image description here

edited 2 hours ago

asked 4 hours ago

Chad Godsey

112

New contributor

How do you split a circle polygon into equal sectors that are 5 degrees in width in QGIS? I have shapefile from a boundary of a field and want to break it into sectors. enter image description here

qgis

edited 2 hours ago

asked 4 hours ago

Chad Godsey

112

New contributor

edited 2 hours ago

asked 4 hours ago

Chad Godsey

112

New contributor

edited 2 hours ago

asked 4 hours ago

Chad Godsey

112

New contributor

asked 4 hours ago

Chad Godsey

112

asked 4 hours ago

Chad Godsey

112

New contributor

Chad Godsey is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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By definition, a quadrant is 1/4 of a circle. I wonder if you meant quadrat, which Wikipedia defines as "a frame, traditionally square, used in ecology and geography to isolate a standard unit of area for study of the distribution of an item over a large area." If so, you should keep in mind that, "modern quadrats can for example be rectangular, circular, or irregular." Please edit your question to clarify how you want to divide up your circle. An image showing the desired output would be helpful.
â€“Â csk
3 hours ago

add a commentÂ |Â

1

By definition, a quadrant is 1/4 of a circle. I wonder if you meant quadrat, which Wikipedia defines as "a frame, traditionally square, used in ecology and geography to isolate a standard unit of area for study of the distribution of an item over a large area." If so, you should keep in mind that, "modern quadrats can for example be rectangular, circular, or irregular." Please edit your question to clarify how you want to divide up your circle. An image showing the desired output would be helpful.
â€“Â csk
3 hours ago

By definition, a quadrant is 1/4 of a circle. I wonder if you meant quadrat, which Wikipedia defines as "a frame, traditionally square, used in ecology and geography to isolate a standard unit of area for study of the distribution of an item over a large area." If so, you should keep in mind that, "modern quadrats can for example be rectangular, circular, or irregular." Please edit your question to clarify how you want to divide up your circle. An image showing the desired output would be helpful.
â€“Â csk
3 hours ago

add a commentÂ |Â

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5 degrees is 1/72 of a circle.

Use the "Minimum enclosing circles" tool to create a circle with 72 segments.

Circle with 72 vertices

Use "Extract Vertices" to turn this circle into 72 points in a layer called Ring.

72 points on a circle

Create a layer with a single point at the centre (actually you could do this with the "Centroid" of the circles) called Hub

Add an attribute to Ring called d with the value 1 for all points.

Add an attribute to Hub called d with the value 1.

Use "Join by lines (hub lines)" with the Hub as the hub and Ring as the spokes, use d as the field in both cases so you match each ring point to the centre. Call this layer Spokes.

72 spokes

Create a Line version of the circle polygon using "Polygons to Lines" called Rim

A line geometry in a circle

Use "Merge Vector Layers" to merge the Spokes with the Rim in a new layer called Wheel.

All the lines we need

Use "Polygonize" on Wheel to build 72 polygons of five degree angle in a new layer called Wedges:

Built polygons

edited 2 hours ago

answered 2 hours ago

Spacedman

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5 degrees is 1/72 of a circle.

Use the "Minimum enclosing circles" tool to create a circle with 72 segments.

Circle with 72 vertices

Use "Extract Vertices" to turn this circle into 72 points in a layer called Ring.

72 points on a circle

Create a layer with a single point at the centre (actually you could do this with the "Centroid" of the circles) called Hub

Add an attribute to Ring called d with the value 1 for all points.

Add an attribute to Hub called d with the value 1.

Use "Join by lines (hub lines)" with the Hub as the hub and Ring as the spokes, use d as the field in both cases so you match each ring point to the centre. Call this layer Spokes.

72 spokes

Create a Line version of the circle polygon using "Polygons to Lines" called Rim

A line geometry in a circle

Use "Merge Vector Layers" to merge the Spokes with the Rim in a new layer called Wheel.

All the lines we need

Use "Polygonize" on Wheel to build 72 polygons of five degree angle in a new layer called Wedges:

Built polygons

edited 2 hours ago

answered 2 hours ago

Spacedman

20.7k13247

add a commentÂ |Â

up vote
3
down vote

5 degrees is 1/72 of a circle.

Use the "Minimum enclosing circles" tool to create a circle with 72 segments.

Circle with 72 vertices

Use "Extract Vertices" to turn this circle into 72 points in a layer called Ring.

72 points on a circle

Create a layer with a single point at the centre (actually you could do this with the "Centroid" of the circles) called Hub

Add an attribute to Ring called d with the value 1 for all points.

Add an attribute to Hub called d with the value 1.

Use "Join by lines (hub lines)" with the Hub as the hub and Ring as the spokes, use d as the field in both cases so you match each ring point to the centre. Call this layer Spokes.

72 spokes

Create a Line version of the circle polygon using "Polygons to Lines" called Rim

A line geometry in a circle

Use "Merge Vector Layers" to merge the Spokes with the Rim in a new layer called Wheel.

All the lines we need

Use "Polygonize" on Wheel to build 72 polygons of five degree angle in a new layer called Wedges:

Built polygons

edited 2 hours ago

answered 2 hours ago

Spacedman

20.7k13247

add a commentÂ |Â

up vote
3
down vote

5 degrees is 1/72 of a circle.

Use the "Minimum enclosing circles" tool to create a circle with 72 segments.

Circle with 72 vertices

Use "Extract Vertices" to turn this circle into 72 points in a layer called Ring.

72 points on a circle

Create a layer with a single point at the centre (actually you could do this with the "Centroid" of the circles) called Hub

Add an attribute to Ring called d with the value 1 for all points.

Add an attribute to Hub called d with the value 1.

Use "Join by lines (hub lines)" with the Hub as the hub and Ring as the spokes, use d as the field in both cases so you match each ring point to the centre. Call this layer Spokes.

72 spokes

Create a Line version of the circle polygon using "Polygons to Lines" called Rim

A line geometry in a circle

Use "Merge Vector Layers" to merge the Spokes with the Rim in a new layer called Wheel.

All the lines we need

Use "Polygonize" on Wheel to build 72 polygons of five degree angle in a new layer called Wedges:

Built polygons

edited 2 hours ago

answered 2 hours ago

Spacedman

20.7k13247

5 degrees is 1/72 of a circle.

Use the "Minimum enclosing circles" tool to create a circle with 72 segments.

Circle with 72 vertices

Use "Extract Vertices" to turn this circle into 72 points in a layer called Ring.

72 points on a circle

Create a layer with a single point at the centre (actually you could do this with the "Centroid" of the circles) called Hub

Add an attribute to Ring called d with the value 1 for all points.

Add an attribute to Hub called d with the value 1.

Use "Join by lines (hub lines)" with the Hub as the hub and Ring as the spokes, use d as the field in both cases so you match each ring point to the centre. Call this layer Spokes.

72 spokes

Create a Line version of the circle polygon using "Polygons to Lines" called Rim

A line geometry in a circle

Use "Merge Vector Layers" to merge the Spokes with the Rim in a new layer called Wheel.

All the lines we need

Use "Polygonize" on Wheel to build 72 polygons of five degree angle in a new layer called Wedges:

Built polygons

edited 2 hours ago

answered 2 hours ago

Spacedman

20.7k13247

edited 2 hours ago

answered 2 hours ago

Spacedman

20.7k13247

answered 2 hours ago

Spacedman

20.7k13247

answered 2 hours ago

Spacedman

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add a commentÂ |Â

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