VISSR tracks cloud motion to supply storm-warning and global atmospheric circulation data.
The VISSR provides high-resolution images of Earth and its cloud cover every 30 minutes. It acquires imagery as it spins west to east at 100 rpm aboard a spin-stabilized spacecraft, step scanning north to south on each spin to provide cloud imagery and data for determining cloud and surface temperatures and wind fields.
VISSRs have flown on five U.S. geosynchronous weather satellites and five Japanese weather satellites (GMS) from 1974 to present. The latest Japanese satellite (GMS-5) went on-line in June 1995 and continues to provide Japan with daily weather images and data.