Buffer around outline of polygon

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I'm fairly new to QGIS, and I'm trying to create a buffer around the outline of Spain (including the coastline and boarders). When I do so, it buffers all the country from center to the edge, I just need the edge if that makes sense.
Many thanks
the picture attached here shows the whole country, and I'd like to buffer the outline of it

asked 2 hours ago

Guillaume

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asked 2 hours ago

Guillaume

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asked 2 hours ago

Guillaume

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qgis buffer

asked 2 hours ago

Guillaume

132

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asked 2 hours ago

Guillaume

132

New contributor

asked 2 hours ago

Guillaume

132

New contributor

asked 2 hours ago

Guillaume

132

asked 2 hours ago

Guillaume

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3 Answers
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For dissolving polygons for buffer, you can just check Dissolve result option in Buffer parameters:

enter image description here

answered 31 mins ago

Oto KalÃ¡b

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2
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You need to do the following:

Dissolve the detailed administrative boundaries based on a field in the attribute table that has same value

The output of the dissolve will have only one boundary that covers whole Spain.

Then you can use buffer to buffer the outline.

If you need only the mainland without considering the islands, then select the mainland and apply buffer on the selected feature.

answered 1 hour ago

ahmadhanb

20k21846

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up vote
1
down vote

The trick is to join all the polygons in your map together,

So given (for example) the GB constituencies:

enter image description here

You run dissolve (in the vector geometry menu of the processing toolbox) to give a single (multi)polygon:

enter image description here

Then you can buffer it as you want.

answered 1 hour ago

Ian Turtonâ™¦

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

up vote
1
down vote

accepted

For dissolving polygons for buffer, you can just check Dissolve result option in Buffer parameters:

enter image description here

answered 31 mins ago

Oto KalÃ¡b

3,79931329

add a commentÂ |Â

up vote
1
down vote

accepted

For dissolving polygons for buffer, you can just check Dissolve result option in Buffer parameters:

enter image description here

answered 31 mins ago

Oto KalÃ¡b

3,79931329

add a commentÂ |Â

up vote
1
down vote

accepted

For dissolving polygons for buffer, you can just check Dissolve result option in Buffer parameters:

enter image description here

answered 31 mins ago

Oto KalÃ¡b

3,79931329

For dissolving polygons for buffer, you can just check Dissolve result option in Buffer parameters:

enter image description here

answered 31 mins ago

Oto KalÃ¡b

3,79931329

answered 31 mins ago

Oto KalÃ¡b

3,79931329

answered 31 mins ago

Oto KalÃ¡b

3,79931329

answered 31 mins ago

Oto KalÃ¡b

3,79931329

add a commentÂ |Â

up vote
2
down vote

You need to do the following:

Dissolve the detailed administrative boundaries based on a field in the attribute table that has same value

The output of the dissolve will have only one boundary that covers whole Spain.

Then you can use buffer to buffer the outline.

If you need only the mainland without considering the islands, then select the mainland and apply buffer on the selected feature.

answered 1 hour ago

ahmadhanb

20k21846

add a commentÂ |Â

up vote
2
down vote

You need to do the following:

Dissolve the detailed administrative boundaries based on a field in the attribute table that has same value

The output of the dissolve will have only one boundary that covers whole Spain.

Then you can use buffer to buffer the outline.

If you need only the mainland without considering the islands, then select the mainland and apply buffer on the selected feature.

answered 1 hour ago

ahmadhanb

20k21846

add a commentÂ |Â

up vote
2
down vote

You need to do the following:

Dissolve the detailed administrative boundaries based on a field in the attribute table that has same value

The output of the dissolve will have only one boundary that covers whole Spain.

Then you can use buffer to buffer the outline.

If you need only the mainland without considering the islands, then select the mainland and apply buffer on the selected feature.

answered 1 hour ago

ahmadhanb

20k21846

You need to do the following:

Dissolve the detailed administrative boundaries based on a field in the attribute table that has same value

The output of the dissolve will have only one boundary that covers whole Spain.

Then you can use buffer to buffer the outline.

If you need only the mainland without considering the islands, then select the mainland and apply buffer on the selected feature.

answered 1 hour ago

ahmadhanb

20k21846

answered 1 hour ago

ahmadhanb

20k21846

answered 1 hour ago

ahmadhanb

20k21846

answered 1 hour ago

ahmadhanb

20k21846

add a commentÂ |Â

up vote
1
down vote

The trick is to join all the polygons in your map together,

So given (for example) the GB constituencies:

enter image description here

You run dissolve (in the vector geometry menu of the processing toolbox) to give a single (multi)polygon:

enter image description here

Then you can buffer it as you want.

answered 1 hour ago

Ian Turtonâ™¦

46k544106

add a commentÂ |Â

up vote
1
down vote

The trick is to join all the polygons in your map together,

So given (for example) the GB constituencies:

enter image description here

You run dissolve (in the vector geometry menu of the processing toolbox) to give a single (multi)polygon:

enter image description here

Then you can buffer it as you want.

answered 1 hour ago

Ian Turtonâ™¦

46k544106

add a commentÂ |Â

up vote
1
down vote

The trick is to join all the polygons in your map together,

So given (for example) the GB constituencies:

enter image description here

You run dissolve (in the vector geometry menu of the processing toolbox) to give a single (multi)polygon:

enter image description here

Then you can buffer it as you want.

answered 1 hour ago

Ian Turtonâ™¦

46k544106

The trick is to join all the polygons in your map together,

So given (for example) the GB constituencies:

enter image description here

You run dissolve (in the vector geometry menu of the processing toolbox) to give a single (multi)polygon:

enter image description here

Then you can buffer it as you want.

answered 1 hour ago

Ian Turtonâ™¦

46k544106

answered 1 hour ago

Ian Turtonâ™¦

46k544106

answered 1 hour ago

Ian Turtonâ™¦

46k544106

answered 1 hour ago

Ian Turtonâ™¦

46k544106

add a commentÂ |Â

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

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