QGIS - filter by polygon size












1















I'm very new to this so bear with me.



Hopefully a relatively simple query.



I have a city map with property boundaries and I am wanting to filter the boundaries by lot size. i.e just show lots (or polygons) of a certain size, or between two sizes. i.e. lots over 700m2, or lots between 800 and 900m2.



The information I have pulled in doesn't have an area column associated with it so thinking I will need to add my own expression?



Any help would be greatly apprecaited.










share|improve this question







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Thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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    1















    I'm very new to this so bear with me.



    Hopefully a relatively simple query.



    I have a city map with property boundaries and I am wanting to filter the boundaries by lot size. i.e just show lots (or polygons) of a certain size, or between two sizes. i.e. lots over 700m2, or lots between 800 and 900m2.



    The information I have pulled in doesn't have an area column associated with it so thinking I will need to add my own expression?



    Any help would be greatly apprecaited.










    share|improve this question







    New contributor




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























      1












      1








      1








      I'm very new to this so bear with me.



      Hopefully a relatively simple query.



      I have a city map with property boundaries and I am wanting to filter the boundaries by lot size. i.e just show lots (or polygons) of a certain size, or between two sizes. i.e. lots over 700m2, or lots between 800 and 900m2.



      The information I have pulled in doesn't have an area column associated with it so thinking I will need to add my own expression?



      Any help would be greatly apprecaited.










      share|improve this question







      New contributor




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












      I'm very new to this so bear with me.



      Hopefully a relatively simple query.



      I have a city map with property boundaries and I am wanting to filter the boundaries by lot size. i.e just show lots (or polygons) of a certain size, or between two sizes. i.e. lots over 700m2, or lots between 800 and 900m2.



      The information I have pulled in doesn't have an area column associated with it so thinking I will need to add my own expression?



      Any help would be greatly apprecaited.







      qgis






      share|improve this question







      New contributor




      Thomas 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




      Thomas 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






      New contributor




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









      asked 6 hours ago









      ThomasThomas

      83




      83




      New contributor




      Thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      New contributor





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






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      Check out our Code of Conduct.






















          1 Answer
          1






          active

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          2














          Just dig into the field calculator, the hints on each function are rather helpful. What you're looking for is $area, which gives you the area of a polygon in square meters - provided your CRS is a projected one (e.g. UTM).



          Either you run the field calculator and then categorise your layer by the column containing the polygon size, or you directly tell the symbology to categorise based on $area (see screenshot).



          enter image description here






          share|improve this answer
























          • Thanks Erik! I've had a play around there and managed to get it to filter as I was after. My next question then: I am looking to filter data by information from two separate layers. i.e. by area from my boundaries layer, then by suburb location from my street address layer. Can this be done without combining them into one set of data?

            – Thomas
            5 hours ago













          • It would be better if you asked this in a separate question, though I think there have been similar questions already.

            – Erik
            5 hours ago






          • 1





            Ok will have a look around and repost if can't work it out. Thanks.

            – Thomas
            5 hours ago











          Your Answer








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          1 Answer
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          active

          oldest

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          1 Answer
          1






          active

          oldest

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          active

          oldest

          votes






          active

          oldest

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          2














          Just dig into the field calculator, the hints on each function are rather helpful. What you're looking for is $area, which gives you the area of a polygon in square meters - provided your CRS is a projected one (e.g. UTM).



          Either you run the field calculator and then categorise your layer by the column containing the polygon size, or you directly tell the symbology to categorise based on $area (see screenshot).



          enter image description here






          share|improve this answer
























          • Thanks Erik! I've had a play around there and managed to get it to filter as I was after. My next question then: I am looking to filter data by information from two separate layers. i.e. by area from my boundaries layer, then by suburb location from my street address layer. Can this be done without combining them into one set of data?

            – Thomas
            5 hours ago













          • It would be better if you asked this in a separate question, though I think there have been similar questions already.

            – Erik
            5 hours ago






          • 1





            Ok will have a look around and repost if can't work it out. Thanks.

            – Thomas
            5 hours ago
















          2














          Just dig into the field calculator, the hints on each function are rather helpful. What you're looking for is $area, which gives you the area of a polygon in square meters - provided your CRS is a projected one (e.g. UTM).



          Either you run the field calculator and then categorise your layer by the column containing the polygon size, or you directly tell the symbology to categorise based on $area (see screenshot).



          enter image description here






          share|improve this answer
























          • Thanks Erik! I've had a play around there and managed to get it to filter as I was after. My next question then: I am looking to filter data by information from two separate layers. i.e. by area from my boundaries layer, then by suburb location from my street address layer. Can this be done without combining them into one set of data?

            – Thomas
            5 hours ago













          • It would be better if you asked this in a separate question, though I think there have been similar questions already.

            – Erik
            5 hours ago






          • 1





            Ok will have a look around and repost if can't work it out. Thanks.

            – Thomas
            5 hours ago














          2












          2








          2







          Just dig into the field calculator, the hints on each function are rather helpful. What you're looking for is $area, which gives you the area of a polygon in square meters - provided your CRS is a projected one (e.g. UTM).



          Either you run the field calculator and then categorise your layer by the column containing the polygon size, or you directly tell the symbology to categorise based on $area (see screenshot).



          enter image description here






          share|improve this answer













          Just dig into the field calculator, the hints on each function are rather helpful. What you're looking for is $area, which gives you the area of a polygon in square meters - provided your CRS is a projected one (e.g. UTM).



          Either you run the field calculator and then categorise your layer by the column containing the polygon size, or you directly tell the symbology to categorise based on $area (see screenshot).



          enter image description here







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 6 hours ago









          ErikErik

          3,354322




          3,354322













          • Thanks Erik! I've had a play around there and managed to get it to filter as I was after. My next question then: I am looking to filter data by information from two separate layers. i.e. by area from my boundaries layer, then by suburb location from my street address layer. Can this be done without combining them into one set of data?

            – Thomas
            5 hours ago













          • It would be better if you asked this in a separate question, though I think there have been similar questions already.

            – Erik
            5 hours ago






          • 1





            Ok will have a look around and repost if can't work it out. Thanks.

            – Thomas
            5 hours ago



















          • Thanks Erik! I've had a play around there and managed to get it to filter as I was after. My next question then: I am looking to filter data by information from two separate layers. i.e. by area from my boundaries layer, then by suburb location from my street address layer. Can this be done without combining them into one set of data?

            – Thomas
            5 hours ago













          • It would be better if you asked this in a separate question, though I think there have been similar questions already.

            – Erik
            5 hours ago






          • 1





            Ok will have a look around and repost if can't work it out. Thanks.

            – Thomas
            5 hours ago

















          Thanks Erik! I've had a play around there and managed to get it to filter as I was after. My next question then: I am looking to filter data by information from two separate layers. i.e. by area from my boundaries layer, then by suburb location from my street address layer. Can this be done without combining them into one set of data?

          – Thomas
          5 hours ago







          Thanks Erik! I've had a play around there and managed to get it to filter as I was after. My next question then: I am looking to filter data by information from two separate layers. i.e. by area from my boundaries layer, then by suburb location from my street address layer. Can this be done without combining them into one set of data?

          – Thomas
          5 hours ago















          It would be better if you asked this in a separate question, though I think there have been similar questions already.

          – Erik
          5 hours ago





          It would be better if you asked this in a separate question, though I think there have been similar questions already.

          – Erik
          5 hours ago




          1




          1





          Ok will have a look around and repost if can't work it out. Thanks.

          – Thomas
          5 hours ago





          Ok will have a look around and repost if can't work it out. Thanks.

          – Thomas
          5 hours ago










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










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