[mkgmap-dev] Internal Error Failed to render Multipolygon

Tue Sep 3 17:09:51 BST 2024

Hi Thomas

I've just loaded the relation 1754729 with JOSM.
JOSM validation reports no errors, but mkgmap (direct, no splitting) gives
errors:

WARN: uk.me.parabola.imgfmt.app.Area  lakeLadoga.osm:
 Area.split 2852864 1400832 2854912 1402880 res 11 can't 2 1

WARN: uk.me.parabola.mkgmap.reader.osm.MultiPolygonRelation  lakeLadoga.osm:
 Multipolygon http://www.openstreetmap.org/relation/1754729 [ele=4.84,
int_name=Ladoga lake, name:en=Lake Ladoga, name=Ладожское озеро, natural=water,
type=multipolygon, water=lake] contains errors.

WARN: uk.me.parabola.mkgmap.reader.osm.MultiPolygonRelation  lakeLadoga.osm:
 Polygon 4611686018427403156(4P)(259078070[118P]) carries role inner but is not
inside any other polygon. Potentially it does not belong to this multipolygon

The area.split WARN happens when there are too many object
(points/lines/polygons) in 1 resolution unit.

The other error is as described.

I notice that this relation was edited a couple of days ago so maybe someone is
fixing or creating problems.

I'll try again in a few days and investigate more deeply.

Regards
Ticker

On Mon, 2024-09-02 at 19:44 +0200, Thomas Morgenstern wrote:
>  Hi Ticker, I found : osmium-tool and splitter works proper. I can the
> splitted <12345678>.osm.pbf open and render in JOSM. JOSM shows the part of
> the multipolygon 1754729, which is inside the boundary of the polygonfile for
> splitter. I assume, mkgmap has the problem. But sorry, I am not a good
> programmer and can not do deeper investigation or find a solution. If you
> interested, I can give you my polygon and the <maptile-number>.osm.pbf.
>  
>  Thomas
>  
>  
> Am 02.09.2024 um 15:04 schrieb Ticker Berkin:
>  
>  
> >  
> > Hi Thomas
> > 
> > I get similar problems just using 
> > 
> >  https://download.geofabrik.de/europe/britain-and-ireland.html
> > 
> > directly. The relations that cause the problem are not within the above
> > combined
> > territories but excluding them would required a much more complicated shape
> > to
> > define the download area.
> > 
> > Ticker
> > 
> > On Mon, 2024-09-02 at 12:42 +0200, Thomas Morgenstern wrote:
> >  
> > >  
> > >  Hi Ticker, i made further investigation. You are right.: the
> > > MultiPolygonRelation 1754729 ('Ladoga sea') was cut by ectract Scandinavia
> > > from europe-latest.osm.pbf using osmium-tool .
> > >  I am not sure, but means this, that osmium can not write a  proper
> > > ectract,
> > > if such Relation must bee split ?
> > >  This means also, osmium has a bug ? I must check my osmium version...
> > >  regards Thomas
> > >  
> > >  
> > > Am 02.09.2024 um 10:30 schrieb Ticker Berkin:
> > >  
> > >  
> > >  
> > > >  
> > > >  
> > > > Hi Thomas
> > > > 
> > > > It isn't related to AngleChecker.
> > > > 
> > > > I notice that both these relations have been changed in the last couple
> > > > of
> > > > days
> > > > so maybe they were faulty.
> > > > 
> > > > The large one is on the boarder with Scandinavia and it is likely that
> > > > the
> > > > map
> > > > extraction download only had part of it and this gives rise to this type
> > > > of
> > > > error.
> > > > 
> > > > Regards
> > > > Ticker
> > > > 
> > > > On Mon, 2024-09-02 at 09:43 +0200, Thomas Morgenstern wrote:
> > > >  
> > > >  
> > > > >  
> > > > >  
> > > > >  Hello , I use mkgmap-4921 with patch from Ticker Berkin -
> > > > > Angelchecker-V6.
> > > > > With that i get in Scandinavia following error : Internal Error Failed
> > > > > to
> > > > > render MultiPolygonRelation 1754729 and 304507. Rel. 1754729 is 
> > > > > 'Ladoga'-
> > > > > sea
> > > > > with 5 226 Elements. Rel.  304507 is Multipolygon=water, 171 Elements.
> > > > >  I assume the error ist not specific to the patch...and more common..
> > > > >  How to avoid this ?
> > > > >  
> > > > >  regards Thomas
> > > > >   
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