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












2














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?










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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
    Dec 12 at 1:59










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    Dec 12 at 2:02
















2














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?










share|improve this question
























  • 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
    Dec 12 at 1:59










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    Dec 12 at 2:02














2












2








2







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?










share|improve this question















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















share|improve this question













share|improve this question




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edited Dec 12 at 2:09









ahmadhanb

21.6k31951




21.6k31951










asked Dec 12 at 1:53









p wat

133




133












  • 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
    Dec 12 at 1:59










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    Dec 12 at 2:02


















  • 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
    Dec 12 at 1:59










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    Dec 12 at 2:02
















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
Dec 12 at 1:59




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
Dec 12 at 1:59












@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
Dec 12 at 2:02




@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
Dec 12 at 2:02










1 Answer
1






active

oldest

votes


















3














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
    Dec 12 at 2:19










  • @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
    Dec 12 at 2:27










  • thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
    – p wat
    Dec 12 at 2:30






  • 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
    Dec 12 at 2:35










  • thank you very much
    – p wat
    Dec 12 at 7:27











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














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
    Dec 12 at 2:19










  • @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
    Dec 12 at 2:27










  • thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
    – p wat
    Dec 12 at 2:30






  • 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
    Dec 12 at 2:35










  • thank you very much
    – p wat
    Dec 12 at 7:27
















3














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
    Dec 12 at 2:19










  • @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
    Dec 12 at 2:27










  • thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
    – p wat
    Dec 12 at 2:30






  • 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
    Dec 12 at 2:35










  • thank you very much
    – p wat
    Dec 12 at 7:27














3












3








3






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 Dec 12 at 2:07









ahmadhanb

21.6k31951




21.6k31951












  • thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
    – p wat
    Dec 12 at 2:19










  • @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
    Dec 12 at 2:27










  • thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
    – p wat
    Dec 12 at 2:30






  • 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
    Dec 12 at 2:35










  • thank you very much
    – p wat
    Dec 12 at 7:27


















  • thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
    – p wat
    Dec 12 at 2:19










  • @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
    Dec 12 at 2:27










  • thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
    – p wat
    Dec 12 at 2:30






  • 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
    Dec 12 at 2:35










  • thank you very much
    – p wat
    Dec 12 at 7:27
















thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
Dec 12 at 2:19




thank you. it work fine. If I want to show polygon intersection specifically. How to do ?
– p wat
Dec 12 at 2:19












@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
Dec 12 at 2:27




@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
Dec 12 at 2:27












thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
Dec 12 at 2:30




thank you. after I use self-intersection value in attribute of intersection is null how to fix this?
– p wat
Dec 12 at 2:30




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
Dec 12 at 2:35




@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
Dec 12 at 2:35












thank you very much
– p wat
Dec 12 at 7:27




thank you very much
– p wat
Dec 12 at 7:27


















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