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= Tools > Join overlapping Areas =

[[JOSMImage(joinareas,48,middle,margin-right=20)]] ''Keyboard shortcut:'' '''{{{Shift+J}}}'''

'''Joins areas that overlap each other.'''

This action merges overlapping [wikitr:/Help/Concepts/Object#Areas areas] together and forms a bigger target area with the common outline.
Areas ''overlap'' if they have an intersection or if they touch at two nodes.

* The area selected first gives its [wikitr:/Help/Concepts/Object#ObjectHistory object history] and [wikitr:/Help/Concepts/Object#ObjectId id] to the target area. 
  So the order of selection matters. 
* All [wikitr:/Help/Concepts/Object#Tags1 tags] from all selected areas will be added to the target area.
  If different values for one key exist, then the user must decide which value should remain. 
  So the [wikitr:/Help/Action/CombineWay#TagsMembershipsConflictDialog Tags/Memberships Conflict Dialog] will open. 
  It may also appear for relation membership issues.
* The additional [wikitr:/Help/Action/CombineWay#CombineConfirmation Combine Confirmation] dialog informs if not all the areas have all the same tags or memberships.
  It appears in [wikitr:/Help/ExpertMode#Standardview standard view] only.
* If an area has no overlap with another one in the Selection, then it is not joined.
  But it gets all tags like the target area and becomes ''modified'' by this.
* Additionally selected nodes do not matter.
* If areas are surrounded by the others and have no intersection with any of them, then the result of this action will be a [wikitr:/Help/Concepts/Object#typemultipolygon multipolygon].

[[Image(buildings-joinoverlappingareas.gif,link=)]] \\
The animation above shows first the creation of two areas with the [osmwiki:JOSM/Plugins/BuildingsTools Building_tools] plugin, then one of them being [wikitr:/Help/Action/Duplicate duplicated] and [wikitr:/Help/Action/Select selected + moved] and finally the Join Areas action to all three areas then selected.

=== Notifications === #Notifications
If the selection does not fit Join overlapping Areas needs, then these notification messages will be presented:
* No overlapping areas in the Selection. [[Image(josm_join_areas_message_no_intersection.png,link=,right,margin-left=20)]]\\
 `No intersection found. Nothing was changed.`\\ \\ \\
* An open way is in the Selection. [[Image(josm_join_areas_message_unclosed.png,link=,right,margin-left=20)]] \\ `One of the selected ways is not closed and therefore cannot be joined.`

No action is performed in these cases.

=== See also === #Seealso
* [[JOSMImage(combineway,middle)]] [wikitr:/Help/Action/CombineWay Combine Way]
* [[JOSMImage(multipoly_create,middle)]] [wikitr:/Help/Action/CreateMultipolygon Create Multipolygon]

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

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Attachments (3)

buildings-joinoverlappingareas.gif (2.0 MB ) - added by openstreetmap.org-user-d1g 9 years ago. https://github.com/mapbox/mapping/wiki/Advanced-mapping-guide#buildings https://github.com/mapbox/mapping/issues/162
josm_join_areas_message_no_intersection.png (5.2 KB ) - added by skyper 5 years ago.
josm_join_areas_message_unclosed.png (6.9 KB ) - added by skyper 5 years ago.

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