[mkgmap-dev] House number search - inaccuracy in city assignment

Sun Feb 7 15:09:42 GMT 2016

OK, I think there is an error, but I have no idea where exactly it is.
My results so far (my bounds file is a bit older, your results may vary):
1) With the default style, the city is normally taken from the bounds, not from addr:city
2) The road has more than 64 routing nodes and is therefore split into two parts, the first part is completely in Ottobrunn,
the 2nd part starts somewhere before housenumber 95 (left side)
3) The housenumber code calculates the right side numbers 116 to 120 to be in Ottobrunn, 122 and following in Hohenbrunn
The numbers 116-118 are in one segment, followed by 120, followed by 122, follwed by some empty segements, followed by 132,
follwed by some empty segements, followed by 134 and 136.
4) With the result of an unmodified r3664 MapSource says that 116-122 are in Hohenbrunn, and for higher numbers the city is empty
So that is for sure not what we want, probably the bit stream is wrong, but out display tool is happy with it and displays what I expected

I see no change in MapSource when I try with a modified version of mkgmap that doesn't decrement the skip value.  

Will try again tomorrow.

Gerd

________________________________________
Von: mkgmap-dev-bounces at lists.mkgmap.org.uk <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <GPetermann_muenchen at hotmail.com>
Gesendet: Sonntag, 7. Februar 2016 13:22
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] House number search - inaccuracy in city assignment

Hi Steffen,
I guess you found a bug, I remember that  I also was
confused by this double decrement
of the skip value when I wrote the code.
I'll try to reproduce the problem later.

Gerd
P.S: I'm a bit sick, so I can't concentrate well since weeks :(
________________________________________
Von: mkgmap-dev-bounces at lists.mkgmap.org.uk <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Steffen Neumann <sn at litotes.de>
Gesendet: Sonntag, 7. Februar 2016 13:14
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] House number search - inaccuracy in city assignment

On 07.02.2016 12:59, Thorsten Kukuk wrote:
> On Sun, Feb 07, Steffen Neumann wrote:
>
>> Morning everybody,
>>
>> playing around with my Garmin Nuvi I came across a problem with the
>> house number search.
>>
>> The location is:
>> Germany, Ottobrunn, Ottostrasse 132
>> +48.064630, +11.689558
>>
>> The Nuvi shows the address as:
>> Ottostrasse 132, Hohenbrunn (so the city is Hohenbrunn here)
>>
>> But in OSM the house is tagged as:
>> Ottostrasse 132, Ottobrunn (different city compared to Nuvi)
>>
>> So either the Garmin pulled the wrong city out of the house number
>> information or mkgmap put the wrong info in.
>
> Not sure if there is a bug in mkgmap or not, but the data in
> OSM is clearly not Ok. The address exits twice at the same place:
> once with addr:city=Ottobrunn, once with addr:city=Hohenbrunn.
> So maybe mkgmap creates both address records and you only looked
> at the wrong one?
> Since everything except this single address is tagged with
> addr:city=Hohenbrunn and the house is inside of the address
> boundary of Hohenbrunn, so the addr:city=Ottobrunn looks wrong to me.
>
> Thorsten
>

Indeed, there's a contradiction in the address assignment at that
location. The building is referred to as belonging to Ottobrunn whereas
the POI nearby has the same address but located in Hohenbrunn.
Unfortunately my knowledge of mkgmap is not deep enough to asses whether
my remark in the code is reasonable.
The Nuvi does not find the house number Ottostrasse 132 in Ottobrunn.

Thanks,
Steffen
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