Pseudo invariant calibration sites have been widely and successfully used on-orbit radiometric trending of optical satellite systems for more than 20 years. At the IVOS 27 meeting in November 2015, a new initiative was established to facilitate coordination and help prioritize research on PICS and their usage for the benefit of the EO community as a whole.

A roadmap has been set up at IVOS 28 in March 2017 where the subjects have been identified and priorities given to:

• PICS’s BRDF characterization
• Spectral characterization
• Atmosphere properties
• Temporal stability
• Combining multiple sites calibration results
• Revisiting the sites

This portal contains general and detailed information about 6 PICS. It provides also a tool simulate the reflectance normalized to nadir. Please register to have access to the document.