How to find intersection polygons in single layer on QGIS version 3.4.2?

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1
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enter image description here

I have polygons intersection in single layer. I want polygon in yellow frame and use polygon intersection to calculate area , how to do this?

edited 1 hour ago

ahmadhanb

21.3k31951

asked 1 hour ago

p wat

New contributor

Have a read of docs.qgis.org/2.18/en/docs/user_manual/plugins/… which will help you find overlapping polygons in the same layer, use the rule Must not overlap
– Michael Stimson
1 hour ago

@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
1 hour ago

add a comment |

up vote
1
down vote

favorite

enter image description here

I have polygons intersection in single layer. I want polygon in yellow frame and use polygon intersection to calculate area , how to do this?

edited 1 hour ago

ahmadhanb

21.3k31951

asked 1 hour ago

p wat

New contributor

Have a read of docs.qgis.org/2.18/en/docs/user_manual/plugins/… which will help you find overlapping polygons in the same layer, use the rule Must not overlap
– Michael Stimson
1 hour ago

@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
1 hour ago

add a comment |

up vote
1
down vote

favorite

enter image description here

I have polygons intersection in single layer. I want polygon in yellow frame and use polygon intersection to calculate area , how to do this?

edited 1 hour ago

ahmadhanb

21.3k31951

asked 1 hour ago

p wat

New contributor

enter image description here

I have polygons intersection in single layer. I want polygon in yellow frame and use polygon intersection to calculate area , how to do this?

polygon qgis-3.0 intersection

edited 1 hour ago

ahmadhanb

21.3k31951

asked 1 hour ago

p wat

New contributor

edited 1 hour ago

ahmadhanb

21.3k31951

asked 1 hour ago

p wat

New contributor

edited 1 hour ago

ahmadhanb

21.3k31951

edited 1 hour ago

ahmadhanb

21.3k31951

edited 1 hour ago

ahmadhanb

21.3k31951

asked 1 hour ago

p wat

New contributor

asked 1 hour ago

p wat

asked 1 hour ago

p wat

New contributor

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

Have a read of docs.qgis.org/2.18/en/docs/user_manual/plugins/… which will help you find overlapping polygons in the same layer, use the rule Must not overlap
– Michael Stimson
1 hour ago

@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
1 hour ago

add a comment |

Have a read of docs.qgis.org/2.18/en/docs/user_manual/plugins/… which will help you find overlapping polygons in the same layer, use the rule Must not overlap
– Michael Stimson
1 hour ago

@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
1 hour ago

Have a read of docs.qgis.org/2.18/en/docs/user_manual/plugins/… which will help you find overlapping polygons in the same layer, use the rule Must not overlap
– Michael Stimson
1 hour ago

@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
1 hour ago

add a comment |

1 Answer
1

active

oldest

votes

up vote
3
down vote

accepted

In the processing toolbox, there is a tool named Polygon self-intersection that can be used to extract the intersection polygon in the same layer:

enter image description here

Input file:

enter image description here

Using the tool:

enter image description here

After running the tool:

enter image description here

Then you can calculate the area.

I am using QGIS 3.4.2

answered 1 hour ago

ahmadhanb

21.3k31951

thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
1 hour ago

@pwat I am not sure how you can show the intersection, but the only thing that can come to my mind is to use the symbology. Go to Layer Properties -> Categorized -> Select ID column or Area column -> Classify your polygons based on ID or Area. You can delete unwanted classes in the style, if necessary
– ahmadhanb
1 hour ago

thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
1 hour ago

1

@pwat What value? if it is area attribute, you should select the row, then select the area field from the drop-down list and write $area and click on update selected. If this is not you question, then it is better to ask another question on another thread and make your question clear because you can only ask one question at a time.
– ahmadhanb
1 hour ago

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
3
down vote

accepted

In the processing toolbox, there is a tool named Polygon self-intersection that can be used to extract the intersection polygon in the same layer:

enter image description here

Input file:

enter image description here

Using the tool:

enter image description here

After running the tool:

enter image description here

Then you can calculate the area.

I am using QGIS 3.4.2

answered 1 hour ago

ahmadhanb

21.3k31951

thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
1 hour ago

@pwat I am not sure how you can show the intersection, but the only thing that can come to my mind is to use the symbology. Go to Layer Properties -> Categorized -> Select ID column or Area column -> Classify your polygons based on ID or Area. You can delete unwanted classes in the style, if necessary
– ahmadhanb
1 hour ago

thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
1 hour ago

1

@pwat What value? if it is area attribute, you should select the row, then select the area field from the drop-down list and write $area and click on update selected. If this is not you question, then it is better to ask another question on another thread and make your question clear because you can only ask one question at a time.
– ahmadhanb
1 hour ago

add a comment |

up vote
3
down vote

accepted

In the processing toolbox, there is a tool named Polygon self-intersection that can be used to extract the intersection polygon in the same layer:

enter image description here

Input file:

enter image description here

Using the tool:

enter image description here

After running the tool:

enter image description here

Then you can calculate the area.

I am using QGIS 3.4.2

answered 1 hour ago

ahmadhanb

21.3k31951

thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
1 hour ago

@pwat I am not sure how you can show the intersection, but the only thing that can come to my mind is to use the symbology. Go to Layer Properties -> Categorized -> Select ID column or Area column -> Classify your polygons based on ID or Area. You can delete unwanted classes in the style, if necessary
– ahmadhanb
1 hour ago

thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
1 hour ago

1

@pwat What value? if it is area attribute, you should select the row, then select the area field from the drop-down list and write $area and click on update selected. If this is not you question, then it is better to ask another question on another thread and make your question clear because you can only ask one question at a time.
– ahmadhanb
1 hour ago

add a comment |

up vote
3
down vote

accepted

In the processing toolbox, there is a tool named Polygon self-intersection that can be used to extract the intersection polygon in the same layer:

enter image description here

Input file:

enter image description here

Using the tool:

enter image description here

After running the tool:

enter image description here

Then you can calculate the area.

I am using QGIS 3.4.2

answered 1 hour ago

ahmadhanb

21.3k31951

In the processing toolbox, there is a tool named Polygon self-intersection that can be used to extract the intersection polygon in the same layer:

enter image description here

Input file:

enter image description here

Using the tool:

enter image description here

After running the tool:

enter image description here

Then you can calculate the area.

I am using QGIS 3.4.2

answered 1 hour ago

ahmadhanb

21.3k31951

answered 1 hour ago

ahmadhanb

21.3k31951

answered 1 hour ago

ahmadhanb

21.3k31951

answered 1 hour ago

ahmadhanb

21.3k31951

thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
1 hour ago

@pwat I am not sure how you can show the intersection, but the only thing that can come to my mind is to use the symbology. Go to Layer Properties -> Categorized -> Select ID column or Area column -> Classify your polygons based on ID or Area. You can delete unwanted classes in the style, if necessary
– ahmadhanb
1 hour ago

thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
1 hour ago

1

@pwat What value? if it is area attribute, you should select the row, then select the area field from the drop-down list and write $area and click on update selected. If this is not you question, then it is better to ask another question on another thread and make your question clear because you can only ask one question at a time.
– ahmadhanb
1 hour ago

add a comment |

thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
1 hour ago

@pwat I am not sure how you can show the intersection, but the only thing that can come to my mind is to use the symbology. Go to Layer Properties -> Categorized -> Select ID column or Area column -> Classify your polygons based on ID or Area. You can delete unwanted classes in the style, if necessary
– ahmadhanb
1 hour ago

thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
1 hour ago

1

@pwat What value? if it is area attribute, you should select the row, then select the area field from the drop-down list and write $area and click on update selected. If this is not you question, then it is better to ask another question on another thread and make your question clear because you can only ask one question at a time.
– ahmadhanb
1 hour ago

thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
1 hour ago

@pwat I am not sure how you can show the intersection, but the only thing that can come to my mind is to use the symbology. Go to Layer Properties -> Categorized -> Select ID column or Area column -> Classify your polygons based on ID or Area. You can delete unwanted classes in the style, if necessary
– ahmadhanb
1 hour ago

thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
1 hour ago

@pwat What value? if it is area attribute, you should select the row, then select the area field from the drop-down list and write $area and click on update selected. If this is not you question, then it is better to ask another question on another thread and make your question clear because you can only ask one question at a time.
– ahmadhanb
1 hour ago

add a comment |

p wat is a new contributor. Be nice, and check out our Code of Conduct.

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