With AfterEffect you pick your story. Whether you want to start after a nuclear disaster, some biological disease that thinned everyone out, some bloody war has ravished the landscape and now all that is left are ruins, or maybe some kind of zombie apocalypse has struck and now its up to you.
This is showing off the world and how the map is rendered. The render zone is reduced during development to show what is rendered, and what is staged. Staged tile's are created but not rendered so that we can quickly swap them without bogging down the process.