Science and Technology · Space Technology

Consider the following statements regarding satellite-based Earth observation systems: I. Optical imaging satellites generally provide high-resolution photos, but their performance is limited by cloud cover and absence of sunlight. II. Synthetic Aperture Radar (SAR) systems use reflected radar signals and can generate surface imagery during night-time and adverse weather conditions. III. Satellites integrating both optical imaging and SAR technologies automatically remove the need for ground data processing. IV. SAR-based imaging systems depend primarily on reflected visible light from the Earth's surface to generate images. Which of the statements given above are correct?