Shared boundary between landuse areas not working

[troNpo]

Shared boundary between two landuse areas (Go Map!!)

Hi, and thanks for your great work on Go Map!!

I’m trying to create a shared boundary between two landuse areas, and I’m not sure whether the app currently supports this or if I’m doing something wrong.

What I’m trying to do

I have an existing landuse=farmland polygon.
Then I created a new landuse=orchard polygon.

My goal is for the new landuse=orchard polygon to use a segment of the existing landuse=farmland polygon as a shared boundary, exactly like in JOSM or iD:

• same nodes
• same line segment
• no duplicated geometry
• orchard polygon closed using that shared segment

What happens in Go Map!!

I connect the orchard’s endpoints to the farmland’s boundary.
In the app, the nodes appear connected, and Go Map!! even shows options like “Divide” or “Incorporate”.

However:

• the orchard polygon does not actually close using the farmland boundary
• the shared segment is not incorporated into the orchard polygon
• when I upload and check the data in the OSM web editor, I get errors such as:
  • “unknown way”
  • “close ends”

This indicates that the orchard polygon is still open and not using the farmland segment as part of its geometry.

Question

Is it currently possible in Go Map!! to make two landuse polygons share the same boundary segment (same nodes and same line), and to close the new polygon using that shared segment?

If it is possible, could you explain the exact workflow?

If not, would it be possible to add this functionality?
It’s essential for editing adjacent landuse areas without duplicating geometry.

Thanks again for maintaining this app — it’s incredibly useful for editing OSM from iPhone.

[bryceco]

Are you talking about iD's "follow" feature? There isn't an equivalent which does that automatically, but you can merge the nodes in the two polygons manually to create the same geometry you would get using iD. I understand that in your example that's a lot of nodes and a lot of work. Let me know the details of how you do it in JOSM/iD.

[troNpo]

Thanks! Yes — I’m specifically referring to iD’s Follow feature.

Follow lets a new polygon automatically reuse the nodes and geometry of an existing polygon’s boundary. On mobile this would be a huge improvement, because manually merging many nodes is slow and difficult. A Follow‑like tool would make creating adjacent landuse areas much faster, avoid duplicated ways, and prevent “close ends” / “unknown way” errors.

It would be a major step forward for mobile OSM editing.

[bryceco]

In my understanding iD requires a tap for each "follow" node you add. Does it allow adding all the missing nodes at once?

I'm imagining you select a way, and then an option under More... that would say something like "Close area", and then we do marching ants along the different possible combinations of segments that would close the area (different colors for different paths), and then the user taps one of them and the points get added to the way.

[troNpo]

Yes — in iD the Follow action adds the entire matching segment at once. You don’t tap node by node; pressing F while drawing makes iD trace and incorporate all the nodes automatically.

Even if a Go Map!! implementation required an extra step (like choosing a suggested closing path), it would still be a fantastic improvement for mobile editing.