Obstacle-free sector isa sector formedby an arc originating at thereference pointof the edge of a helideckandextendingoutwardin the horizontal plane level with the elevation of the helideck.
It is hoped it will constitute a referencepoint for policy makers at the local level, as well a basis for the exchange of knowledge between researchers, city professionals and local authorities on developing inclusive cities.
The reference to a test of a "higher level" could suggest North Korea has reached a point where it can test a weapon made from highly enriched uranium, rather than the plutonium fissile material used in its two previous tests.