Opened 7 days ago

Last modified 6 days ago

#20130 new enhancement

Use mapcss rules instead of CrossingWays java code to find overlapping areas

Reported by: GerdP Owned by: team
Priority: normal Milestone:
Component: Core validator Version:
Keywords: crossing Cc: Klumbumbus, simon04

Description (last modified by GerdP)

Today we use the java code in CrossingWays to find e.g. "Crossing building/residential area".
This should better be done using a rule like this

/* Building overlapping landuse residential (spatial test) */
area[building][building!~/no|entrance/]  area[landuse=residential]{
  throwWarning: tr("Overlapping buildings/residential area");


  • it also handles multipolygons (if they are complete)
  • it marks the overlapping area, not the crossing segments
  • it also handles overlaps where the two areas share nodes

In r17084 CrossingWays also finds crossings between

  • building/waterway=riverbank ("Crossing building/waterway")
  • building/railway=platform ("Crossing building/railway" (false positive?)

It doesn't find other crossing like those between building/natural=water, see #20121

Maybe it is possible to create a single mapcss test to catch different types of areas which shouldn't overlap a building?

I didn't test the impact on performance, I assume it is rather small.

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Change History (5)

comment:1 Changed 7 days ago by GerdP

Description: modified (diff)

comment:2 Changed 6 days ago by Don-vip

Cc: simon04 added
Component: CoreCore validator
Keywords: crossing added

I think we already discussed about it in another ticket and there was a problem, but I don't remember what. I believe CrossingWays is doing something better than the mapCSS rule, maybe the UI reporting of the crossing location, or something like that.

comment:3 Changed 6 days ago by GerdP

In the past, the highlighting of CrossingWays was better, now it's rather the other way around.

comment:4 in reply to:  description Changed 6 days ago by skyper

Replying to GerdP:


  • it marks the overlapping area, not the crossing segments

Actually with long ways, I prefer the highlighting of the crossing segments. Selecting the object is already possible, so highlighting the whole ways is not an advantage.

comment:5 Changed 6 days ago by GerdP

so highlighting the whole ways is not an advantage.

I don't understand. It is not highlighting the whole way unless the whole area is overlapping. With building the area is rarely large. F6 zooms to the interesting (=overlapping) area.
Please try the proposed rule and compare the highlighting.

Anyway, more important is that it finds all overlaps.

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