[mkgmap-dev] address search and case significance of street name

Sat Apr 18 09:10:13 BST 2015

Hi all,

sorry, answering my own qestion again...

The same problem can occur with city names and place names and so on,
also two connectect roads may have that problem, so RoadMerger would not 
merge them.
If mkgmap could change all names to upper (or lower) case, no problem, but that
is probably not what we want. On the other hand, mkgmap cannot decide
which spelling is correct.
The only simple solution that I see is to use a data structure 
like this:
For each kind of string (city name, place name, region name,street name, ...)
we create a map with 
TreeMap<String, String>(String.CASE_INSENSITIVE_ORDER);
The maps are filled while processing the OSM elements, so the first entry is used
for all elements.
Example: Relations are processed first, so image that one type=street
relation has a name=Abc Street.
This string is saved in the map.
If any element processed later has a name like "ABC street" or "abc Street" 
which we consider as a street name, we will use "Abc Street" again.

I've just tried that and the performance impact is small, so
I think this is better, and the additional code for that is only ~30 lines.

Gerd

From: gpetermann_muenchen at hotmail.com
To: mkgmap-dev at lists.mkgmap.org.uk
Date: Sat, 18 Apr 2015 07:32:21 +0200
Subject: [mkgmap-dev] address search and case significance of street name

Hi all,

in some areas, esp. in CZ, I see quite a lot of houses where the addr:street 
name is slightly different to that of the nearest road. 
Sample:
http://www.openstreetmap.org/way/296555634
has name="K Zahrádkám"  (with capital "Z")
while some houses, e.g.
http://www.openstreetmap.org/way/53658380
have addr:street="K zahrádkám" 

I thought that this is handled by a bot, but this difference
exists now for quite a while.

I assume that mkgmap should always ignore case 
when it compares these tags? Or should that depend on the option
"--lower-case" ?

Gerd

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