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How to perform magic with the JOSM building-tools-plugin

The operations to create a building with the JOSM building-plugin shown in the picture in this post.
How do they split the long side of the house so one can extrude with X?

The picture is from Github/Mapbox/Mapping and their recipe to do this is

B to start with buildings tool
X to extrude building shapes as per the imagery.
Shift+Ctrl to rotate buildings.
Q to orthogonalize buildings
Shift+J to merge polygons

alt text

building josm mapbox buildingtools plugin

asked 03 Apr '17, 21:38

FredrikLindseth
815●13●24●35
accept rate: 13%

edited 03 Apr '17, 22:05

aseerel4c26 ♦
32.6k●18●248●554

One Answer:

5	A double click with the extrude tool creates the split. It's briefly mentioned on the help page: https://josm.openstreetmap.de/wiki/Help/Action/Extrude answered 03 Apr '17, 22:10 maxerickson 12.7k●10●83●176 accept rate: 32%