Hi Sarah, Thank you very much for the response.
Another related question, does this abbreviation wiki page is been used as a data source in Nominatim? https://wiki.openstreetmap.org/wiki/Name_finder:Abbreviations The text says it does but I couldn't find any reference to it in the docs at the Github repository. Thanks, Vitor On Wed, Apr 5, 2017 at 4:42 PM, Sarah Hoffmann <[email protected]> wrote: > Hi, > > On Wed, Apr 05, 2017 at 08:37:52AM -0300, Vitor George wrote: > > When searching > > "Biblioteca Prestes Maia" [1] > > the > > best result should be "Biblioteca Prefeito Prestes Maia" [2], instead the > > results are > > other *bibliotecas* (libraries) with different names. This affects very > > much the usability of Nominatim in Portuguese. > > > > Is there support to stop words? Could Nominatim be using PostgreSQL full > > text search? > > Nominatim has limited support for searching for partial words and also > for a few stop words. However, the latter is very difficult to implement > in a system that has to work with arbirary languages. As it happens, > search in your example trips over stop words. What happens is this: > > 'en' is marked as a stop word in Nominatim because it is 'and' in > some languages. Stop words are handled in Nominatim by removing them > completely from search terms and queries. Nominatim can also handle > so-called special phrases which are used for POI search. These allow > you to enter phrases like 'restaurant near Trafalgar Square' or > 'supermarket in Berlin'. One of the Spanish special phrases is > 'biblioteca in'. Because of the stop word deletion that gets shortend > to 'biblioteca'. So, one of the interpretations of your search > query above becomes 'find me a library in Prestes Maia'. And that's > the results you see. > > To resolve this, the stop word handling in Nominatim needs to be > changed to not unconditionally delete stop words but leave them > in where they are essential. This is unfortunately not a simple > change and requires rewriting some of the fundamentals of how > query normalisation works. Until it's done I'm rather reluctant > to add new stop words or special terms. > > Kind regards > > Sarah > >
_______________________________________________ Geocoding mailing list [email protected] https://lists.openstreetmap.org/listinfo/geocoding
