Hello,
Thank you for your question.
The swiss search system of
map.geo.admin.ch works through Sphinx.
For exact search, we use
SPH_RANK_WORDCOUNT for weight calculation. The search string is supplemented with infix/prefix/subfix wildcards for the search.
Whereas SPH_RANK_BM25 is used for fuzzy search. Fuzziness is achieved with the
quorum operator at search text level and with the Metaphone code at search word level.
We hope we could be of help with this answer.
Best regards,
Helpdesk federal geoportal