[mkgmap-dev] How can we use prefix/suffix feature in road names?

Wed Apr 12 12:12:41 BST 2017

Hi

A few thoughts on this:

Should it be a style invoked function.

Can the prefixes and suffixes be country defined and selected by, say,
admin boundary. Is there already a place where mkgmap has country
dependent info (like drive-on=)?

I used to live on "Avenue Road" - slight care needs to be taken on how
it is implemented for these strange cases

Ticker

On Wed, 2017-04-12 at 10:13 +0000, Gerd Petermann wrote:
> Hi all,
> 
> recently I learned about this feature which is already partly
> implemented in mkgmap, but not easy to use with OSM data.
> See 
> http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2017q2/026602.html
> There is at least one visible effect of these 0x1e and 0x1f
> characters: When you zoom out MapSource removes the prefix / suffix
> part(s) from
> the name. So "Rue de la Concorde" is displayed as "Concorde" which
> requires less space and probably allows to display more names.
> If I got that right the prefixes and suffixes are also excluded from
> the index by mkgmap, but that might not yet work.
> 
> My understanding is that we need a way to change the a road label
> "Rue de la Concorde" 
> to "Rue de la" + 0x1e +"Concorde" or "Fernrodder Strasse" to
> "Fernrodder" + 0x1f + "Strasse".
> 
> Does anybody already use that feature in style rules? 
> 
> I can think of several ways to implement that. 
> 1) A collection of style rules for well known prefixes and suffixes.
> I fear those would be quite complex.
> 
> 2) A new option file listing prefixes and suffixes and some Java code
> to modify all road labels. Format of the file might be
> prefix=Rue de la 
> prefix=Rue du 
> prefix=Rue de
> prefix=Rue
> prefix=Rua
> prefix=Chemin de la
> prefix=Chemin du
> prefix=Chemin de
> prefix=Chemin
> ...
> suffix=Road
> suffix=Steet
> suffix=Strasse
> suffix=Weg
> ...
> 
> I assume it is possible to compile a single regular expression from
> this, so performance should not be a problem.
> 
> Gerd
> 
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