osgEarth is a C++ terrain rendering toolkit. Just create a simple XML file,
point it at your imagery, elevation, and vector data, load it into your favorite
OpenSceneGraph application, and go!

osgEarth supports all kinds of data and comes with lots of examples to help you
get up and running quickly and easily.

Some optional requirements are recommended for enhanced functionality
and/or performance. They include:
    poco, protobuf, rocksdb