$ sudo apt-get update
$ sudo apt-get install osgearth-data 

osgearth-data is installed in your system.

Make ensure the osgearth-data package were installed using the commands given below,

$ sudo dpkg-query -l | grep osgearth-data *

You will get with osgearth-data package name, version, architecture and description in a table

osgearth-data package basic information: