What is "outerra"

Outerra is a Slovakian computer software company best known for its middleware 3D planetary graphics engine, called Outerra engine, in development since 2008. The engine renders high-quality terrain, terrain texturing, flora and water flow normal maps using relatively sparse and highly compressed data through fractal processing and other types of procedural generation. The game Anteworld uses real world data to create a virtual replica of planet Earth.