Guest Editorial: Ubiquitous IoT with Integrated Space, Air, Ground, and Ocean Networks

Global connections to everyone and anything are becoming increasingly important as Internet of Things (IoT) applications and services spread throughout our society. Such needs cannot be met by terrestrial networks alone. Hence the idea of combining space, air, ground, and water communication infrastructures has emerged. The integrated platform that emerges from this process should not simply be a mashup of several networks and domains. It is extremely difficult to manage heterogeneity and hybridity's full potential at the world's largest geographical scale ever.