Polygons not containing other polygons

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I have two large polygon data-sets, one highlights the building footprints and one indicating parcel outlines. I want to find all parcels without a building on them. Essentially all parcel A's which do not contain a parcel B. Is the Spatial query, select by location the best way to do this? The files are very large and often crash.

edited 2 hours ago

Kadir

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asked 3 hours ago

ADN FRS

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Welcome to GIS SE. If you have not done so, please take the tour to learn about our focused Q&A format. Please edit your question to detail what you have tried, and if you are seeing crashes, please include any crash messages.
â€“Â Andy
3 hours ago

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1
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edited 2 hours ago

Kadir

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asked 3 hours ago

ADN FRS

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Welcome to GIS SE. If you have not done so, please take the tour to learn about our focused Q&A format. Please edit your question to detail what you have tried, and if you are seeing crashes, please include any crash messages.
â€“Â Andy
3 hours ago

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edited 2 hours ago

Kadir

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asked 3 hours ago

ADN FRS

New contributor

qgis select-by-location

edited 2 hours ago

Kadir

3,92011226

asked 3 hours ago

ADN FRS

New contributor

edited 2 hours ago

Kadir

3,92011226

asked 3 hours ago

ADN FRS

New contributor

edited 2 hours ago

Kadir

3,92011226

edited 2 hours ago

Kadir

3,92011226

edited 2 hours ago

Kadir

3,92011226

asked 3 hours ago

ADN FRS

New contributor

asked 3 hours ago

ADN FRS

asked 3 hours ago

ADN FRS

New contributor

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

Welcome to GIS SE. If you have not done so, please take the tour to learn about our focused Q&A format. Please edit your question to detail what you have tried, and if you are seeing crashes, please include any crash messages.
â€“Â Andy
3 hours ago

add a commentÂ |Â

Welcome to GIS SE. If you have not done so, please take the tour to learn about our focused Q&A format. Please edit your question to detail what you have tried, and if you are seeing crashes, please include any crash messages.
â€“Â Andy
3 hours ago

Welcome to GIS SE. If you have not done so, please take the tour to learn about our focused Q&A format. Please edit your question to detail what you have tried, and if you are seeing crashes, please include any crash messages.
â€“Â Andy
3 hours ago

add a commentÂ |Â

2 Answers
2

active

oldest

votes

up vote
2
down vote

Yes, Select by location is the right tool. (In this example I used Extract by location but they are essentially the same).

To reduce QGIS' burden, we can:

Process data without showing the layers on the map canvas

Perform only one task at one time.

For example:

(1) Consider we want to extract Parcel 103 (no buildings).

enter image description here

(2) Restart QGIS (or just remove all layers) to empty the map area.

(3) Activate Extract by location (under Processing Toolbox | Vector selection tools).

enter image description here

Click on the ... button and select parcel data.

Click on the ... button and select buildings data.

Select disjoint for the Geometric predicate.

Run the too..

(4) We will get new Extracted layer.

enter image description here

I echo ThingumaBob that you may as well consider changing data provider.

answered 2 hours ago

Kazuhito

12.7k31472

+1 - I usually use any form of SQL over built in tools and finding non-intersections is a bit of a pain (e.g. using plain ST_Disjoint on two tables results in a cross product etc.); if QGIS handles that elegantly, better use this than my suggestion.
â€“Â ThingumaBob
16 mins ago

add a commentÂ |Â

up vote
1
down vote

I think you could

select all features of your polygon layer

run an intersection filter via Select by location on selected features

choose Removing from current selection

Main point:

If those files (shapefiles?) are large enough to crash QGIS, consider moving to GeoPackage, or PostGIS even.

edited 1 hour ago

answered 3 hours ago

ThingumaBob

4,5181222

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
2
down vote

Yes, Select by location is the right tool. (In this example I used Extract by location but they are essentially the same).

To reduce QGIS' burden, we can:

Process data without showing the layers on the map canvas

Perform only one task at one time.

For example:

(1) Consider we want to extract Parcel 103 (no buildings).

enter image description here

(2) Restart QGIS (or just remove all layers) to empty the map area.

(3) Activate Extract by location (under Processing Toolbox | Vector selection tools).

enter image description here

Click on the ... button and select parcel data.

Click on the ... button and select buildings data.

Select disjoint for the Geometric predicate.

Run the too..

(4) We will get new Extracted layer.

enter image description here

I echo ThingumaBob that you may as well consider changing data provider.

answered 2 hours ago

Kazuhito

12.7k31472

+1 - I usually use any form of SQL over built in tools and finding non-intersections is a bit of a pain (e.g. using plain ST_Disjoint on two tables results in a cross product etc.); if QGIS handles that elegantly, better use this than my suggestion.
â€“Â ThingumaBob
16 mins ago

add a commentÂ |Â

up vote
2
down vote

Yes, Select by location is the right tool. (In this example I used Extract by location but they are essentially the same).

To reduce QGIS' burden, we can:

Process data without showing the layers on the map canvas

Perform only one task at one time.

For example:

(1) Consider we want to extract Parcel 103 (no buildings).

enter image description here

(2) Restart QGIS (or just remove all layers) to empty the map area.

(3) Activate Extract by location (under Processing Toolbox | Vector selection tools).

enter image description here

Click on the ... button and select parcel data.

Click on the ... button and select buildings data.

Select disjoint for the Geometric predicate.

Run the too..

(4) We will get new Extracted layer.

enter image description here

I echo ThingumaBob that you may as well consider changing data provider.

answered 2 hours ago

Kazuhito

12.7k31472

+1 - I usually use any form of SQL over built in tools and finding non-intersections is a bit of a pain (e.g. using plain ST_Disjoint on two tables results in a cross product etc.); if QGIS handles that elegantly, better use this than my suggestion.
â€“Â ThingumaBob
16 mins ago

add a commentÂ |Â

up vote
2
down vote

Yes, Select by location is the right tool. (In this example I used Extract by location but they are essentially the same).

To reduce QGIS' burden, we can:

Process data without showing the layers on the map canvas

Perform only one task at one time.

For example:

(1) Consider we want to extract Parcel 103 (no buildings).

enter image description here

(2) Restart QGIS (or just remove all layers) to empty the map area.

(3) Activate Extract by location (under Processing Toolbox | Vector selection tools).

enter image description here

Click on the ... button and select parcel data.

Click on the ... button and select buildings data.

Select disjoint for the Geometric predicate.

Run the too..

(4) We will get new Extracted layer.

enter image description here

I echo ThingumaBob that you may as well consider changing data provider.

answered 2 hours ago

Kazuhito

12.7k31472

Yes, Select by location is the right tool. (In this example I used Extract by location but they are essentially the same).

To reduce QGIS' burden, we can:

Process data without showing the layers on the map canvas

Perform only one task at one time.

For example:

(1) Consider we want to extract Parcel 103 (no buildings).

enter image description here

(2) Restart QGIS (or just remove all layers) to empty the map area.

(3) Activate Extract by location (under Processing Toolbox | Vector selection tools).

enter image description here

Click on the ... button and select parcel data.

Click on the ... button and select buildings data.

Select disjoint for the Geometric predicate.

Run the too..

(4) We will get new Extracted layer.

enter image description here

I echo ThingumaBob that you may as well consider changing data provider.

answered 2 hours ago

Kazuhito

12.7k31472

answered 2 hours ago

Kazuhito

12.7k31472

answered 2 hours ago

Kazuhito

12.7k31472

answered 2 hours ago

Kazuhito

12.7k31472

+1 - I usually use any form of SQL over built in tools and finding non-intersections is a bit of a pain (e.g. using plain ST_Disjoint on two tables results in a cross product etc.); if QGIS handles that elegantly, better use this than my suggestion.
â€“Â ThingumaBob
16 mins ago

add a commentÂ |Â

+1 - I usually use any form of SQL over built in tools and finding non-intersections is a bit of a pain (e.g. using plain ST_Disjoint on two tables results in a cross product etc.); if QGIS handles that elegantly, better use this than my suggestion.
â€“Â ThingumaBob
16 mins ago

+1 - I usually use any form of SQL over built in tools and finding non-intersections is a bit of a pain (e.g. using plain ST_Disjoint on two tables results in a cross product etc.); if QGIS handles that elegantly, better use this than my suggestion.
â€“Â ThingumaBob
16 mins ago

add a commentÂ |Â

up vote
1
down vote

I think you could

select all features of your polygon layer

run an intersection filter via Select by location on selected features

choose Removing from current selection

Main point:

If those files (shapefiles?) are large enough to crash QGIS, consider moving to GeoPackage, or PostGIS even.

edited 1 hour ago

answered 3 hours ago

ThingumaBob

4,5181222

add a commentÂ |Â

up vote
1
down vote

I think you could

select all features of your polygon layer

run an intersection filter via Select by location on selected features

choose Removing from current selection

Main point:

If those files (shapefiles?) are large enough to crash QGIS, consider moving to GeoPackage, or PostGIS even.

edited 1 hour ago

answered 3 hours ago

ThingumaBob

4,5181222

add a commentÂ |Â

up vote
1
down vote

I think you could

select all features of your polygon layer

run an intersection filter via Select by location on selected features

choose Removing from current selection

Main point:

If those files (shapefiles?) are large enough to crash QGIS, consider moving to GeoPackage, or PostGIS even.

edited 1 hour ago

answered 3 hours ago

ThingumaBob

4,5181222

I think you could

select all features of your polygon layer

run an intersection filter via Select by location on selected features

choose Removing from current selection

Main point:

If those files (shapefiles?) are large enough to crash QGIS, consider moving to GeoPackage, or PostGIS even.

edited 1 hour ago

answered 3 hours ago

ThingumaBob

4,5181222

edited 1 hour ago

answered 3 hours ago

ThingumaBob

4,5181222

answered 3 hours ago

ThingumaBob

4,5181222

answered 3 hours ago

ThingumaBob

4,5181222

add a commentÂ |Â

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

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