In the arena of EO there is a great multitude of institutions, organisations and programs. To find the right information and images for your purpose will require just a few but the right contacts. In order to get the full picture it is important to shed some light on who is doing what.

In EO there is a number of players and they basically form two teams:

- the space segment, which includes all spaceborne activities and
- the ground segment, which covers the activities on Earth.