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











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
    3 hours ago










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    3 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
    3 hours ago










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    3 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




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









asked 3 hours ago









p wat

83




83




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.





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.






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
    3 hours ago










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    3 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
    3 hours ago










  • @MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
    – p wat
    3 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
3 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
3 hours ago












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




@MichaelStimson Thank you but I want Intersection polygon to calculate area intersection, you have any solution?
– p wat
3 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











Your Answer








StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "79"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});






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










draft saved

draft discarded


















StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fgis.stackexchange.com%2fquestions%2f305775%2fhow-to-find-intersection-polygons-in-single-layer-on-qgis-version-3-4-2%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown

























1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






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.










draft saved

draft discarded


















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













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












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
















Thanks for contributing an answer to Geographic Information Systems Stack Exchange!


  • Please be sure to answer the question. Provide details and share your research!

But avoid …



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.





Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


Please pay close attention to the following guidance:


  • Please be sure to answer the question. Provide details and share your research!

But avoid …



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fgis.stackexchange.com%2fquestions%2f305775%2fhow-to-find-intersection-polygons-in-single-layer-on-qgis-version-3-4-2%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







-

Popular posts from this blog

What visual should I use to simply compare current year value vs last year in Power BI desktop

Image
0 I have column SubToBind that shows current year ratio and column PY SubToBind which shows previous year ratio. How can I simply create a card that would be displaying them both in a nice way? Something like that: I cannot achieve that with regular card, I also tried Card with States by OKViz but also unable to see both values. In KPI visual - I dont like the word "Goal", it will confuse end users. Are there any cards or other visuals that would do the job? Thanks powerbi dax powerbi-embedded share | improve this question edited Jun 11 '18 at 20:11 Oleg ...
Read more

How to ignore python UserWarning in pytest?

Image
up vote 1 down vote favorite I am using openpyxl for parsing .xlsm files, and pytest for testing. When I open a file, I get the: OpenPyxl -> UserWarning: Data Validation extension is not supported and will be removed That is not really a problem bcs. program works and I can't change the .xlsm file to fix that. But... When I run pytest with something like: def test_wrong_file_format(): assert check_excel(open_excel('file.xlsm')) == True I will get the warning i mentioned altought check_excel(open_excel('file.xlsm')) returns True and the test should suceed... Is there a nice way to tell the pytest that "It's not a bug it's a feature" and tests should pass even when they get this warning? Is there other way than using something like: with pytest.warns(UserWarning): ...
Read more

Alexandru Averescu

Image
Alexandre Averescu Alexandru Averescu Naissance 3 avril 1859 Babele, Ismail  (ro) près de Izmaïl (principauté de Moldavie) Décès 2 octobre 1938 (à 79 ans) [ 1 ] Bucarest Origine   Roumanie Arme cavalerie Grade Maréchal Années de service 1901-1917 Commandement chef d'état-major général 2 e  armée 3 e  armée Groupe d'armée sud armée du Danube Conflits Guerre russo-turque de 1877-1878 Deuxième guerre balkanique Première Guerre mondiale Faits d'armes Bataille de Turtucaia/Tutrakan Bataille de Mărăști Distinctions Autres fonctions 3 fois président du Conseil des ministres ministre des Affaires étrangères ministre sans portefeuille conseiller de la Couronne modifier   Alexandre Averescu (en roumain : Alexandru Averescu .mw-parser-output .prononciation>a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Loudspeaker.svg/11px-Loudspeaker.svg.png")center ...
Read more