logo separator

[mkgmap-dev] problem with address search and --code-page

From Steve Ratcliffe steve at parabola.me.uk on Wed Feb 19 09:44:35 GMT 2014


> First tests are good :).


>                             But something strange happens with location of
> some house numbers. For example Pulawska 67 (in Warszawa city) is here:
> http://osm.org/go/0OyvXjAp5
> but on Mapsource is shown here:
> http://osm.org/go/0OyvSy29r
> This is more than 1 kilometer apart!

That would be odd, but I notice that in OSM one of the buildings
is marked as number 13 (presumably in error - should be 113 is my 
guess).  And 67 is pretty much mid way between 13 and 113. So could
you check that as a source of the problem?

> Also addresses like Municypalna 14 are shifted about 50m.  Another bug

Numbers are spread evenly between road junctions, so you can't expect
them to be exactly in position. We know how to deal with cases
where houses are bunched on one part of a road between junctions
which would allow us to improve that and it would be an interesting
problem for someone to implement.

> is related to uncommon house numbers like 12a, 67/69, etc. When given an
> address like Municypalna 12a, Mapsource tries to locate Municypalna 12

Searchable numbers must be just plain numbers (or if not, we don't
know how to implement such things).

What does 67/69 mean? It could be 67 and 69, 67, 68, 69, or building
67 appartment number 69 and interpretation might differ
in different countries. Probably something that can be improved though.

> (which is elsewhere, probably interpolated because no node with such
> housenumber is in OSM).
> When I enter address Pulawska 67/69, Mapsource shows Pulawska 623.
> Main branch of mkgmap behaves in similar way, but addresses are shifted
> slightly different (When entering Municypalna 12a, Mapsource searches
> for Municypalna 23, Pulawska 67 is in different place - still wrong).
> This doesn't seem to be related with --code-page switch.

Well, yes, I don't really expect that the work I am doing should
have any affect on housenumber search that are not related
to street names. Housenumber improvements are a separate task.

Best wishes

More information about the mkgmap-dev mailing list