How do you use QGIS to remove portions of polygons that overlap in the same layer?
Is there a way to easily eliminate the overlapping portions of polygons in the same layer?
For example, I want to turn this
into this
I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?
qgis
edited 4 hours ago
csk
7,577833
asked 5 hours ago
ChadChad
111
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Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
Is there a way to easily eliminate the overlapping portions of polygons in the same layer?
For example, I want to turn this
into this
I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?
qgis
edited 4 hours ago
csk
7,577833
asked 5 hours ago
ChadChad
111
New contributor
Chad 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 including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.
– csk
4 hours ago
add a comment |
Is there a way to easily eliminate the overlapping portions of polygons in the same layer?
For example, I want to turn this
into this
I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?
qgis
edited 4 hours ago
csk
7,577833
asked 5 hours ago
ChadChad
111
New contributor
Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Is there a way to easily eliminate the overlapping portions of polygons in the same layer?
For example, I want to turn this
into this
I used Union to break the polygons apart where they overlapped, and then used Delete Duplicate Geometries to get rid of half the overlaps, but still had to manually delete the others. That's fine for the example, but won't work with the large amount of polygons that will be in the real data. Is there a better way to do this?
qgis
qgis
edited 4 hours ago
csk
7,577833
asked 5 hours ago
ChadChad
111
New contributor
Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 hours ago
csk
7,577833
asked 5 hours ago
ChadChad
111
New contributor
Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 4 hours ago
csk
7,577833
edited 4 hours ago
csk
7,577833
edited 4 hours ago
csk
7,577833
7,577833
asked 5 hours ago
ChadChad
111
New contributor
Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 hours ago
ChadChad
111
asked 5 hours ago
ChadChad
111
111
New contributor
Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Chad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Chad 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 including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.
– csk
4 hours ago
add a comment |
Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.
– csk
4 hours ago
Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.
– csk
4 hours ago
Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.
– csk
4 hours ago
add a comment |
2 Answers
2
active
oldest
votes
Use the Symmetrical Difference tool.
Symmetrical difference
This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.
answered 4 hours ago
cskcsk
7,577833
Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.
– Chad
3 hours ago
add a comment |
QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).
It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.
Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use the Symmetrical Difference tool.
Symmetrical difference
This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.
answered 4 hours ago
cskcsk
7,577833
Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.
– Chad
3 hours ago
add a comment |
Use the Symmetrical Difference tool.
Symmetrical difference
This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.
answered 4 hours ago
cskcsk
7,577833
Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.
– Chad
3 hours ago
add a comment |
Use the Symmetrical Difference tool.
Symmetrical difference
This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.
answered 4 hours ago
cskcsk
7,577833
Use the Symmetrical Difference tool.
Symmetrical difference
This algorithm extracts the portions of features from both the Input and Overlay layers that do not overlap. Overlapping areas between the two layers are removed. The attribute table of the Symmetrical Difference layer contains original attributes from both the Input and Difference layers.
answered 4 hours ago
cskcsk
7,577833
answered 4 hours ago
cskcsk
7,577833
answered 4 hours ago
cskcsk
7,577833
answered 4 hours ago
cskcsk
7,577833
7,577833
Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.
– Chad
3 hours ago
add a comment |
Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.
– Chad
3 hours ago
Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.
– Chad
3 hours ago
Thanks for the help. But does this only work if they are in different layers? When I tried it, I got a blank layer. All the overlapping features will be in the same layer.
– Chad
3 hours ago
add a comment |
QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).
It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.
Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
add a comment |
QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).
It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.
Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
add a comment |
QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).
It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.
Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
QGIS Processing Toolbox has a SAGA Polygon self-intersection tool (under SAGA | Vector polygon tools).
It works much like QIGS Union Tool, while this tool retains only one feature per the overlapped area.
Open the attribute table of generated Intersection layer and select Delete all features whose fid (or id) is 0.
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
edited 22 mins ago
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
answered 1 hour ago
KazuhitoKazuhito
14.9k31677
14.9k31677
add a comment |
add a comment |
Chad is a new contributor. Be nice, and check out our Code of Conduct.
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Thank you for including "before" and "after" images of what you're trying to achieve. It made your question easy to understand.
– csk
4 hours ago