QGIS - filter by polygon size
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
asked 6 hours ago
ThomasThomas
83
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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
asked 6 hours ago
ThomasThomas
83
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.
add a comment |
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
asked 6 hours ago
ThomasThomas
83
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
qgis
asked 6 hours ago
ThomasThomas
83
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
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
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
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.
Check out our Code of Conduct.
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.
Thomas is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
1 Answer
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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).
answered 6 hours ago
ErikErik
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
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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oldest
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active
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votes
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).
answered 6 hours ago
ErikErik
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
add a comment |
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).
answered 6 hours ago
ErikErik
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
add a comment |
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).
answered 6 hours ago
ErikErik
3,354322
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).
answered 6 hours ago
ErikErik
3,354322
answered 6 hours ago
ErikErik
3,354322
answered 6 hours ago
ErikErik
3,354322
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
add a comment |
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
add a comment |
Thomas is a new contributor. Be nice, and check out our Code of Conduct.
Thomas is a new contributor. Be nice, and check out our Code of Conduct.
Thomas is a new contributor. Be nice, and check out our Code of Conduct.
Thomas is a new contributor. Be nice, and check out our Code of Conduct.
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