openstreetmap - How does routing services for OSM determine the distance between two points -

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i going design android application , needing distances of pathways inside our university(pathways between buildings)

i read osm(openstreetmap) , tried it. map editable means can contribute map(like wikipedia map version).

it has many routing services give routes , directions between 2 point(start , end).

there routing service named graphhopper , easy use. can drag , drop start , end pt , gives distance(km) between 2 pts.

what want know how did come distance?

is distance reliable , accurate?

any appreciated because want use distances android app , need know if these distances have basis.

the distance 'accurate' in sense correctly processes existing information openstreetmap , correctly adds road segments final route. can try local area , compare own knowledge.

there mapping errors, road incorrectly mapped. , there roads missing , router uses detour making path unnecessarily longer. there different modes cars or bikes or fastest , shortest different distance between 2 coordinates.


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