The Committee on Earth Observation Satellites (CEOS) is providing information and data for Calibration (Cal) and Validation (Val) of Earth Observation (EO) data through this portal.

This portal shall support worldwide activities on calibration and validation, and specifically ensure that sensor intercalibration is favoured in a standardised way. The overall goal is to increase measurement accuracy of all the sensors which will be supported by this system, so that the GMES (Global Monitoring for Environment and Security) programme can be served with the best information products available.

Currently the portal is dedicated to calibration of Infrared and Visible Optical Sensors (IVOS). It is frequently updated and will be further extended to other instruments as well as to validation in future releases.