[mkgmap-dev] inc/address and --housenumbers

Wed Apr 15 14:50:42 BST 2015

Hi Andrzej,

I read the cgpsmapper manual, if I got that right
the additional city names are only used in indexes, 
and I assume that there is no limit in those structures,
so you are probably right, I don't have to split a road
because it is in different cities, I just have to pass the information
to the routines which build the indexes.

 @Steve: 
If wonder if we should change the data structures for this.
Current code has the class MapElement with
these fields:
private String zip,country,region,city,street,phone,houseNumber,isIn;

If we change zip, country,region, and city to String[] arrays as with 
String[] labels;
we will waste a lot of memory when almost of them contain a single 
String reference.
On the other hand, we probably have many objects with identical 
values in these fields.
I think we can use a dictionary for this.
The dictionary would contain one entry for each different combination of
the values and MapElement would contain an index to the dictionary entry.
I have to check that, but I think in the end we might safe memory with that.

Gerd

> Date: Wed, 15 Apr 2015 14:07:55 +0200
> From: popej at poczta.onet.pl
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] inc/address and --housenumbers
> 
> Hi Gerd,
> 
>  > 2) A road may be the border or very close to the border of a city.
>  > Houses on the left side are in city A, houses on the other side are
>  > in city B. I think in this case we should add the road twice to the
>  > map so that address search works.
> 
> A road at the border of 2 cities can have 2 different addresses, 
> including road name, zip code, city and region. Maybe country too? I 
> don't think that duplicating road object is a right solution. Road name 
> can be added as a second label, I hope that other data can have multiple 
> values too.
> 
> Cgpsmapper allows for 2 addresses for a road, it probably doesn't 
> duplicate road line, but I haven't checked.
> 
> -- 
> Best regards,
> Andrzej
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