Canada's Optical Spectrograph and InfraRed Imaging System (OSIRIS) is the optical payload on Sweden's Odin satellite. It works in synergy with Sweden's advanced radiometer and measures atmospheric composition.

Since 2001, OSIRIS has obtained valuable information on the upper atmosphere. It focuses its attention on altitudes from 7 to 90 km—between the highest mountains and the edge of space—and measures concentrations of ozone, aerosols and nitrogen dioxide.

Data provided by OSIRIS helps scientists better understand the impact of human activities and natural phenomena on the environment and climate.