This might not be of use, but if you're trying to add a multipolygon for
a building with a hole in it then in JOSM it's really easy:
1. Use the building tool to create multiple rectangles over the
building, including any courtyard.
2. Select all the building rectangles, with the courtyard one last (or
at least, not first).
3. Press shift-J to join them all together. It magically makes the
required relation.
Docs at https://josm.openstreetmap.de/wiki/Help/Action/JoinAreas
—Sam
On 31/3/22 11:15, Graeme Fitzpatrick wrote:
Does anybody know of a simple, straight-forward, how-to for creating
multipolygons using JOSM?
If possible, I'd prefer a document rather than video, but beggars
can't be choosers!
I've already found a couple, but they either don't explain how-to, or
I get different results when I do what they say?
That "could" be because I'm using JOSM for Windows? (Have to as no
Java on my laptop!)
Thanks
Graeme
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