Areas overlap and subtract

[abdullahO2]

Hello When two natural areas overlap, one does not appear on vtm but does on mapsforge:

• Application used: Cruiser 3.0.7
• The map used: Arab-Peninsular - 2023-01-06 from OpenAndroMaps: https://www.openandromaps.org/en/downloads/asia-middle-east
• Theme used: Elevate - Elements 5.2
• Image location: https://www.openstreetmap.org/#map=11/25.5604/47.3477 25.5187, 47.3542

[devemux86]

Thanks for the detailed report.

This is a known issue in OpenGL, see https://github.com/mapsforge/vtm/issues/212.

• There is a possible workaround with the VTM theme attribute mesh (with side effects: https://github.com/mapsforge/vtm/issues/224#issuecomment-564487735)
• Or organize the theme rules better, if they are not declared as separate layers (see https://github.com/mapsforge/vtm/issues/224#issuecomment-261043687)

Both cases require to modify the theme and it can be difficult with themes for Mapsforge engine.

[abdullahO2]

Thank you so much

[devemux86]

Let's keep it open, in case we can do something in the library.

[devemux86]

Another case was reported in Cruiser Discussions: https://github.com/devemux86/cruiser/discussions/38

About a natural=water north of Munich: https://www.openstreetmap.org/relation/12048180

[abdullahO2]

I tried adding the following: place=region region:type=mountain_area This led to the tag: natural=sand being ignored and the polygon representing the sand disappeared. Here is an example of relation that no longer appear in OAM maps: https://www.openstreetmap.org/relation/10827666 https://www.openstreetmap.org/relation/12048768

This was resolved from OAM: https://www.openandromaps.org/oam-forums/topic/naturalsand-and-placeregion#post-55198