CEOS Working Groups address topics such as calibration/validation, data portals, capacity building, disaster management, climate, and common data processing standards shared across a wide range of Earth observation domains. 

• Working Group on Capacity Building & Data Democracy

• CEOS/CGMS Working Group on Climate

• Working Group on Calibration & Validation

• Working Group on Disasters

• Working Group on Information Systems & Services 

The CEOS Virtual Constellations coordinate space-based, ground-based, and/or data delivery systems to meet a common set of requirements within a specific domain.

• Atmospheric Composition
• Land Surface Imaging
• Ocean Colour Radiometry
• Ocean Surface Topography
• Ocean Surface Vector Wind
• Precipitation
• Sea Surface Temperature

CEOS has the ability to create an Ad Hoc Team in the event that permanent mechanisms (Working Groups and Virtual Constellations) are insufficient for CEOS to undertake a particular activity.

• The Ad Hoc Team on Sustainable Development Goals

• The Coastal Observations Applications Services and Tools Ad Hoc Team (COAST)

CEOS engages in a wide variety of other exciting activities in support of the CEOS Mission:

• Analysis Ready Data (ARD)
• Biodiversity Activities
• CEOS Ocean Variables Enabling Research and Applications for GEO Initiative (COVERAGE)
• Earth Observation Training, Education, and Capacity Development Network (EOTEC DevNet)
• Global Stocktake 
• CEOS Systems Engineering Office