This article in «New York Times» says that several hours before the incident, Russia's air traffic control has closed more than a dozen airways at various elevations on the way of the route of Flight 17. (politics.stackexchange.com)
As part of the study, a common garden containing Tamarix from various elevations and latitudes was cultivated at the University of Arizona Mesa Farm in Yuma. (sciencedaily.com)
They consist of a variety of larger homes that have been built on various elevations which can lead to unique gameplay and firefights. (pcgamer.com)