But the reduced vertical distance between air lanes means that this could put the plane on collision course with a third aircraft much sooner than in the past. (newscientist.com)
This suggested a minimum vertical distance of 600m between the depth of fracking and aquifers used for drinking water, which now forms the basis of hydraulic fracturing regulation in the UK's Infrastructure Act 2015. (sciencedaily.com)
Wave height - vertical distance from crest to. (slideplayer.com)