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Public-images-osm logo.svg descent
Descent into Glen Isla - - 2860487.jpg
The accumulated descent for any kind of non-physical route. Show/edit corresponding data item.
Group: routes
Used on these elements
should not be used on nodesshould not be used on waysshould not be used on areasmay be used on relations
Status: in use

descent=descent in m is used to indicate the total accumulated descent in meters of a route relation. Usually indicating ascent=ascent in m should be enough, use descent=descent in m if it differs from the ascent (of course only possible if the route goes from A to B and is no roundtrip) (insert other useful applications if here).

If you want to use another unit=km/m/miles/mph/... use descent=descent value plus unit=km/m/miles/mph/... separating the unit from the descent key, makes it easier for handling the data.This is not accepted tagging practice and is not widely used. Instead, units are commonly given as part of a value, like maxspeed=30 mph or height=2 m.