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











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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







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  • 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
    2 hours ago










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















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?






polygon qgis-3.0 intersection







share|improve this question









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
    2 hours ago










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













up vote
1
down vote

favorite









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?






polygon qgis-3.0 intersection







share|improve this question









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.











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




polygon qgis-3.0 intersection






share|improve this question









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.











share|improve this question









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.









share|improve this question




share|improve this question








edited 2 hours ago









ahmadhanb

21.3k31951




21.3k31951






New contributor




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asked 3 hours ago









p wat

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83




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






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
    2 hours ago










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










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












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




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










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






share|improve this answer





















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










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











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1 Answer
1






active

oldest

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1 Answer
1






active

oldest

votes









active

oldest

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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






share|improve this answer





















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










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















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






share|improve this answer





















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










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













up vote
3
down vote



accepted







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






share|improve this answer












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







share|improve this answer












share|improve this answer



share|improve this answer










answered 2 hours ago









ahmadhanb

21.3k31951




21.3k31951












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










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


















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










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
















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




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












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




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




1




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
2 hours 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
2 hours ago










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










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