Change color polygons by area of polygons












2














I have polygons with the area in the attribute table and I want change polygons to red color if they have area less 70.



area and polygon






qgis







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Evgeny Ryvkin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • Thank you for help, yes is also a GOOD answer, if I want to save the changes in GeoJSON, can I do it or I need to create an attribute table different column and save the color by a polygon?
    – Evgeny Ryvkin
    45 mins ago










  • See this for saving styles in geojson: gis.stackexchange.com/questions/22474/… If this does not answer your question open up a new one. Also feel free to mark the answer that answered your question the best as accepted. See our short Tour.
    – MrXsquared
    38 mins ago










  • is help me and useful, I just try to learn more about this program.
    – Evgeny Ryvkin
    36 mins ago










  • Unrelated to your question, but I noticed that the feature in the top-left of your screenshot looks like it has self-intersecting boundaries, which would make it an invalid geometry.
    – csk
    15 mins ago
















2














I have polygons with the area in the attribute table and I want change polygons to red color if they have area less 70.



area and polygon






qgis







share|improve this question









New contributor




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




















  • Thank you for help, yes is also a GOOD answer, if I want to save the changes in GeoJSON, can I do it or I need to create an attribute table different column and save the color by a polygon?
    – Evgeny Ryvkin
    45 mins ago










  • See this for saving styles in geojson: gis.stackexchange.com/questions/22474/… If this does not answer your question open up a new one. Also feel free to mark the answer that answered your question the best as accepted. See our short Tour.
    – MrXsquared
    38 mins ago










  • is help me and useful, I just try to learn more about this program.
    – Evgeny Ryvkin
    36 mins ago










  • Unrelated to your question, but I noticed that the feature in the top-left of your screenshot looks like it has self-intersecting boundaries, which would make it an invalid geometry.
    – csk
    15 mins ago














2












2








2







I have polygons with the area in the attribute table and I want change polygons to red color if they have area less 70.



area and polygon






qgis







share|improve this question









New contributor




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











I have polygons with the area in the attribute table and I want change polygons to red color if they have area less 70.



area and polygon






qgis




qgis






share|improve this question









New contributor




Evgeny Ryvkin 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




Evgeny Ryvkin 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 1 hour ago









Vince

14.4k32647




14.4k32647






New contributor




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









asked 1 hour ago









Evgeny Ryvkin

111




111




New contributor




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





New contributor





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






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












  • Thank you for help, yes is also a GOOD answer, if I want to save the changes in GeoJSON, can I do it or I need to create an attribute table different column and save the color by a polygon?
    – Evgeny Ryvkin
    45 mins ago










  • See this for saving styles in geojson: gis.stackexchange.com/questions/22474/… If this does not answer your question open up a new one. Also feel free to mark the answer that answered your question the best as accepted. See our short Tour.
    – MrXsquared
    38 mins ago










  • is help me and useful, I just try to learn more about this program.
    – Evgeny Ryvkin
    36 mins ago










  • Unrelated to your question, but I noticed that the feature in the top-left of your screenshot looks like it has self-intersecting boundaries, which would make it an invalid geometry.
    – csk
    15 mins ago


















  • Thank you for help, yes is also a GOOD answer, if I want to save the changes in GeoJSON, can I do it or I need to create an attribute table different column and save the color by a polygon?
    – Evgeny Ryvkin
    45 mins ago










  • See this for saving styles in geojson: gis.stackexchange.com/questions/22474/… If this does not answer your question open up a new one. Also feel free to mark the answer that answered your question the best as accepted. See our short Tour.
    – MrXsquared
    38 mins ago










  • is help me and useful, I just try to learn more about this program.
    – Evgeny Ryvkin
    36 mins ago










  • Unrelated to your question, but I noticed that the feature in the top-left of your screenshot looks like it has self-intersecting boundaries, which would make it an invalid geometry.
    – csk
    15 mins ago
















Thank you for help, yes is also a GOOD answer, if I want to save the changes in GeoJSON, can I do it or I need to create an attribute table different column and save the color by a polygon?
– Evgeny Ryvkin
45 mins ago




Thank you for help, yes is also a GOOD answer, if I want to save the changes in GeoJSON, can I do it or I need to create an attribute table different column and save the color by a polygon?
– Evgeny Ryvkin
45 mins ago












See this for saving styles in geojson: gis.stackexchange.com/questions/22474/… If this does not answer your question open up a new one. Also feel free to mark the answer that answered your question the best as accepted. See our short Tour.
– MrXsquared
38 mins ago




See this for saving styles in geojson: gis.stackexchange.com/questions/22474/… If this does not answer your question open up a new one. Also feel free to mark the answer that answered your question the best as accepted. See our short Tour.
– MrXsquared
38 mins ago












is help me and useful, I just try to learn more about this program.
– Evgeny Ryvkin
36 mins ago




is help me and useful, I just try to learn more about this program.
– Evgeny Ryvkin
36 mins ago












Unrelated to your question, but I noticed that the feature in the top-left of your screenshot looks like it has self-intersecting boundaries, which would make it an invalid geometry.
– csk
15 mins ago




Unrelated to your question, but I noticed that the feature in the top-left of your screenshot looks like it has self-intersecting boundaries, which would make it an invalid geometry.
– csk
15 mins ago










2 Answers
2






active

oldest

votes


















3














Create a rule based symbology like this:
One with the rule "area" < 70 and one with the rule ELSE
("area" refers to an attribute value while $area calculates the area; use the one you need; according to your sceenshot it is "area")



enter image description here






share|improve this answer





















  • Many Thanks to you, that helps me!
    – Evgeny Ryvkin
    55 mins ago



















3














Here's another method. It's not really any better than MrXsquared's answer, but I had already started writing it.



Use data-defined settings to control fill color



enter image description here



with this expression:
if("area"<70, '#ff0000','#00ff00')



This expression will set the fill color to red (#ff0000 in hex notation) when the area is less than 70, and green otherwise.



enter image description here



If you want to use different shades of red and green, you can get the hex notation for the desired color from the "select color" dialog - just select the color you want and scroll down to find the hex notation near the bottom.



enter image description here






share|improve this answer





















  • Thank you for your answer, yes is a good example of how can I write different color in hexa and using data-defined.
    – Evgeny Ryvkin
    33 mins ago











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














Create a rule based symbology like this:
One with the rule "area" < 70 and one with the rule ELSE
("area" refers to an attribute value while $area calculates the area; use the one you need; according to your sceenshot it is "area")



enter image description here






share|improve this answer





















  • Many Thanks to you, that helps me!
    – Evgeny Ryvkin
    55 mins ago
















3














Create a rule based symbology like this:
One with the rule "area" < 70 and one with the rule ELSE
("area" refers to an attribute value while $area calculates the area; use the one you need; according to your sceenshot it is "area")



enter image description here






share|improve this answer





















  • Many Thanks to you, that helps me!
    – Evgeny Ryvkin
    55 mins ago














3












3








3






Create a rule based symbology like this:
One with the rule "area" < 70 and one with the rule ELSE
("area" refers to an attribute value while $area calculates the area; use the one you need; according to your sceenshot it is "area")



enter image description here






share|improve this answer












Create a rule based symbology like this:
One with the rule "area" < 70 and one with the rule ELSE
("area" refers to an attribute value while $area calculates the area; use the one you need; according to your sceenshot it is "area")



enter image description here







share|improve this answer












share|improve this answer



share|improve this answer










answered 1 hour ago









MrXsquared

779216




779216












  • Many Thanks to you, that helps me!
    – Evgeny Ryvkin
    55 mins ago


















  • Many Thanks to you, that helps me!
    – Evgeny Ryvkin
    55 mins ago
















Many Thanks to you, that helps me!
– Evgeny Ryvkin
55 mins ago




Many Thanks to you, that helps me!
– Evgeny Ryvkin
55 mins ago













3














Here's another method. It's not really any better than MrXsquared's answer, but I had already started writing it.



Use data-defined settings to control fill color



enter image description here



with this expression:
if("area"<70, '#ff0000','#00ff00')



This expression will set the fill color to red (#ff0000 in hex notation) when the area is less than 70, and green otherwise.



enter image description here



If you want to use different shades of red and green, you can get the hex notation for the desired color from the "select color" dialog - just select the color you want and scroll down to find the hex notation near the bottom.



enter image description here






share|improve this answer





















  • Thank you for your answer, yes is a good example of how can I write different color in hexa and using data-defined.
    – Evgeny Ryvkin
    33 mins ago
















3














Here's another method. It's not really any better than MrXsquared's answer, but I had already started writing it.



Use data-defined settings to control fill color



enter image description here



with this expression:
if("area"<70, '#ff0000','#00ff00')



This expression will set the fill color to red (#ff0000 in hex notation) when the area is less than 70, and green otherwise.



enter image description here



If you want to use different shades of red and green, you can get the hex notation for the desired color from the "select color" dialog - just select the color you want and scroll down to find the hex notation near the bottom.



enter image description here






share|improve this answer





















  • Thank you for your answer, yes is a good example of how can I write different color in hexa and using data-defined.
    – Evgeny Ryvkin
    33 mins ago














3












3








3






Here's another method. It's not really any better than MrXsquared's answer, but I had already started writing it.



Use data-defined settings to control fill color



enter image description here



with this expression:
if("area"<70, '#ff0000','#00ff00')



This expression will set the fill color to red (#ff0000 in hex notation) when the area is less than 70, and green otherwise.



enter image description here



If you want to use different shades of red and green, you can get the hex notation for the desired color from the "select color" dialog - just select the color you want and scroll down to find the hex notation near the bottom.



enter image description here






share|improve this answer












Here's another method. It's not really any better than MrXsquared's answer, but I had already started writing it.



Use data-defined settings to control fill color



enter image description here



with this expression:
if("area"<70, '#ff0000','#00ff00')



This expression will set the fill color to red (#ff0000 in hex notation) when the area is less than 70, and green otherwise.



enter image description here



If you want to use different shades of red and green, you can get the hex notation for the desired color from the "select color" dialog - just select the color you want and scroll down to find the hex notation near the bottom.



enter image description here







share|improve this answer












share|improve this answer



share|improve this answer










answered 52 mins ago









csk

6,795733




6,795733












  • Thank you for your answer, yes is a good example of how can I write different color in hexa and using data-defined.
    – Evgeny Ryvkin
    33 mins ago


















  • Thank you for your answer, yes is a good example of how can I write different color in hexa and using data-defined.
    – Evgeny Ryvkin
    33 mins ago
















Thank you for your answer, yes is a good example of how can I write different color in hexa and using data-defined.
– Evgeny Ryvkin
33 mins ago




Thank you for your answer, yes is a good example of how can I write different color in hexa and using data-defined.
– Evgeny Ryvkin
33 mins ago










Evgeny Ryvkin is a new contributor. Be nice, and check out our Code of Conduct.










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Evgeny Ryvkin is a new contributor. Be nice, and check out our Code of Conduct.













Evgeny Ryvkin is a new contributor. Be nice, and check out our Code of Conduct.












Evgeny Ryvkin is a new contributor. Be nice, and check out our Code of Conduct.
















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