[mkgmap-dev] mixed index branch merge

Mon Feb 16 13:05:46 GMT 2015

Hi Steve,

I fear I don't understand what problem you see
with roads like 'The Avenue'
My understanding is that we put the full name into the
index, so the road can be found. On the other hand,
nobody would expect to find this road by typing 
just avenue, right?

Gerd

> Date: Mon, 16 Feb 2015 00:21:26 +0000
> From: steve at parabola.me.uk
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] mixed index branch merge
> 
> 
> Hi
> 
> There are some interesting comments here.
> 
> I did have code to count the number of times certain words appeared in
> a name in attempt to automatically create a stop word list for a map.
> It turned out that it wasn't all that useful, for England at least.
> 
>  From the numbers you get stop words such as 'The', 'Avenue' and
> 'Road' as you would expect.  However many streets have names such as
> 'The Avenue' 'Avenue Road' and so on that consist entirely of
> likely stop words. And these are not theoretical names that occur
> infrequently, these are names of streets that I know.
> 
> I think we really need to be able to identify which parts of the
> name are useful to index, rather than which parts are not.
> 
> So for England I think that the only rule required is to index from
> the beginning of the name, as now.
> 
> For places where streets are named after people and there is
> no word for 'street' included, and the street is generally
> refered to by the second name then probably adding entries
> for all parts of the name will work.
> 
> For places where there is a word for street at the beginning
> then we have to step over that word and any following
> prepositions etc.  So for France not just
> "Rue", but any following "de", "des", "d'" etc.
> 
> The required action does of course depend on language rather than
> country, but we don't in general have the language, so we will have to
> start out using the country (or perhaps region) and see how that goes.
> I suspect it will work quite well, but if not we can think of
> something else when the problems are more well known.
> 
> I guess we will start out having configurable rule types and
> word lists, but we need to gather sensible defaults once
> a working system is developed for each country.
> 
> ..Steve
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