Indian Space Research Organisation Radar Imaging Satellite

IRS satellites so far have been designed to provide data in the visible and near infrared region of electro-magnetic spectrum. The collection of data in these bands by the electro-optic imaging sensors has a limitation in the presence of clouds and fog, as the electromagnetic radiation in these wavelengths cannot penetrate the clouds/fog. India being a tropical country has a perennial cloud presence during kharif season (July October), which is the prime monsoon period in the country