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[mkgmap-dev] [Patch v1] avoid wrong bearing results

From Gerd Petermann gpetermann_muenchen at hotmail.com on Fri Nov 1 09:01:17 GMT 2013

Hi Marko,

> >the patch (this v1) is only meant to solve routing problems caused by 
> >rounding I don't think that it has an influence on SeaGenerator.
> Right, I was too optimistic, hoping that this would fix the bogus 
> warnings in SeaGenerator too.

Maybe it is possible to use the higher precision for this as well.
I assume we just have to use it when converting to 
java areas in Java2DConverter.

> The patch (or some other change since r2795) did make 2 of 4 warnings 
> for roundabout flare roads go away. Only the following remained:
> 2013/10/31 21:17:17 WARNING (StyledConverter): 63240002.osm.pbf: 
> Roundabout segment 35062431 direction looks wrong (see 
> http://www.openstreetmap.org/?mlat=60.23825&mlon=24.88777&zoom=17)
> 2013/10/31 21:17:18 WARNING (StyledConverter): 63240002.osm.pbf: 
> Roundabout segment 34151581 direction looks wrong (see 
> http://www.openstreetmap.org/?mlat=60.23242&mlon=24.95879&zoom=17)
> 2013/10/31 21:17:37 WARNING (RouteNode): 63240005.osm.pbf: Outgoing 
> roundabout flare road (4;9;13;23 Vaajakoskentie, 
> http://www.openstreetmap.org/browse/way/221616945) points in wrong 
> direction?  
> http://www.openstreetmap.org/?mlat=62.24637&mlon=25.87302&zoom=17
> Both roundabout segments are in micro-mapped roundabouts that have been 
> split because of route relations.
> I reverted your patch and reran with today's dump. I got again the usual 
> 5 roundabout warnings (2 more about flare roads) than the above. So, 
> your patch is making a positive difference there.

OK, that's what I expected :-)
As I said, the patch was a quick hack, I just wanted to demonstrate that
we only have to change a few lines to store the higher precision,
and it will not cost more memory.

> >Do you have a reason for not using precompiled sea?
> Yes. I mainly use mkgmap as a validator, and I am routinely fixing 
> errors in finland.osm.pbf. The sea polygons are not severely broken that 
> often, it is usually just anti-islands.  Only about once per month I 
> have to fire up JOSM with an Osmosis-made extract of natural=coastline 
> to see what is wrong.
OK, I see. I'll try with the same data to check what can be changed.

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