[[TranslatedPages]]

= Tools > Create Multipolygon =

[[JOSMImage(multipoly_create,link=,middle,48,margin-right=20)]] ''Keyboard shortcut:'' **`Ctrl+B`**

This tool quickly creates a [[JOSMImage(data/multipolygon)]] [wikitr:/Help/Concepts/Object#typemultipolygon multipolygon], one of the most common [[JOSMImage(data/relation)]] [wikitr:/Help/Concepts/Object#Relations relations].

[wikitr:/Help/Dialog/SelectionList Selected] [[JOSMImage(data/way)]] [wikitr:/Help/Concepts/Object#Ways ways] will be [wikitr:/Help/Concepts/Object#Members members] of the multipolygon with appropriate [wikitr:/Help/Concepts/Object#Roles roles], `outer` or `inner`, and most of the [wikitr:/Help/Concepts/Object#Tags tags] in common are moved from the `outer` ways to the multipolygon.

== Examples ==#Examples
=== A multipolygon with single outer ring and single inner ring ===#MultipolySingleOuterAndInner
 1. Select a relation members that would form:
   a. an outer ring ([wikitr:/Help/Concepts/Object#Ways ways]) - in this demo we will use [wikitr:/Help/Action/SelectNonBranchingWaySequences Select > Non-branching way sequences] to speed up process. 
   a. an inner ring
 1. after all members selected, activate a tool
 1. enter details using [wikitr:/Presets presets], [wikitr:/Help/Dialog/TagsMembership Tags/Membership Dialog] or [wikitr:/Help/Dialog/RelationEditor Relation editor]
 1. This tool creates only valid multipolygons, but you may **optionally** check that new mutipolygon contains no mistakes using [wikitr:/Help/Dialog/Validator validator], as there might be mistakes after human intervention.

A new relation with single [wikitr:/Help/Concepts/Object#Tags tag] `type=multipolygon` would be created. You can add more details, using tags such as `natural=water` for water objects and so on.

[[Image(3seg_outer_1seg_inner.gif,link=)]]

== Advanced Preferences ==#AdvancedPreferences
These preferences allow to change the behavior of the action.
||= **Property** =||= **Default** =||= **Description** =||
|| **`multipoly.alltags`** ||  `false`  || enable/disable moving all keys of `outer` ways which have not several explicit values. Linear tags are still respected. ||
|| **`multipoly.lineartagstokeep`** || `[barrier,fence_type,source]` || A list of keys which are not moved to the relation ||
|| **`multipoly.movetags`** ||  `true`  || enable/disables the moving of tags completely ||
|| **`multipoly.show-relation-editor`** ||  `false`  || enable/disable the opening of the relation editor dialog after creating the multipolygon ||

== See also
* [[JOSMImage(multipoly_update,24,link=,middle)]] [wikitr:/Help/Action/UpdateMultipolygon Update Multipolygon]

----
Back to [wikitr:/Help/Menu/Tools Menu Tools] \\
Back to [wikitr:/Help/Menu Main Menu] \\
Back to [wikitr:/Help Main Help]