Why map matching returned confidence greater than 1 ?

[Rejudge-F]

Hi team, When i use mm(map matching) to snip some gps trace i found some matching confidence greater than 1.f, I would like to know under what circumstances this result occurs. THX

[SiarheiFedartsou]

Hey, could you give particular example? At least which exactly number greater than 1 you’ve seen.

[Rejudge-F]

Sry, I just saw it once, haven't met recently, when I encounter this situation again, I will add it here.

THX

[Rejudge-F]

Hi @SiarheiFedartsou ,I think this is a bug here, when i debug this, i found fmt::format_to(std::back_inserter(buffer), FMT_COMPILE("{}"), number.value); is bad support for extremely small numbers like 0.0000000000017114087924596788, if osrm confidence = 0.0000000000017114087924596788, fmt::format_to(std::back_inserter(buffer), FMT_COMPILE("{}"), double(0.0000000000017114087924596788)); will return 1.7114087924, it's a completely wrong result.
I have submitted a PR about this bug, hope you will merge into the master branch after review.
Best wishes to you!