OpenStreetMap

Managed forest polygon not rendering

Posted by jorchr on 15 August 2018 in English (English)

Several years ago someone added a big area as polygon around Svenljunga with id 616239831, tagged as Managed forest. It was outlined in a crude way, with long distances between nodes. Since then, it has been refined at several occations and a lot of inner relations have been added. I had a go last weekend and added a lot of inner relations where there is openings in the forest.

Today I noticed that the entire area was missing from the rendered map. I can’t find any apparent problem with the area, except that it might be too complex. Can anyone explain why it fails to render?

Actually my feeling is that the polygon should be divided into smaller polygons, but I have no idea how to do it, considering the may inner relations of the area. Each inner relation will need to be added to the correct smaller polygon, of course. I am afraid of loosing many hours of work, if something goes wrong. What can be done?

Location: Svenljunga kommun, Svenljunga, Västra Götaland County, Region Götaland, 51250, Sweden

Comment from imagico on 15 August 2018 at 20:57

That’s a broken multipolygon:

http://tools.geofabrik.de/osmi/?view=areas&lon=12.92661&lat=57.46135&zoom=10

And yes, splitting this into smaller and less complex polygons is a good idea.

Comment from Warin61 on 15 August 2018 at 22:22

I have much larger polygons … and that is after they have been split for my own sanity!

It is ~50 km wide and some 40 km tall. Some I have edited are at least twice that size.

PS along with the id .. you should say way .. not relation. The first thing I searched on was relation 61623983 :) The polygon is now fixed.

Comment from Warin61 on 15 August 2018 at 22:46

I have removed the crossing ways of the golf course and a water feature, that should help the renders. I also added some details for the golf course.

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