APT (Automatic Picture Transmission)

APT (Automatic Picture Transmission) is a communication system used by weather satellites to send images of Earth's surface and atmosphere back to ground stations. It transmits continuous, real-time pictures in a straightforward, analog format that can be received with basic equipment. APT images typically show clouds, weather patterns, and geographic features, aiding meteorologists and enthusiasts in monitoring weather conditions. The system is designed for simplicity and reliability, making it accessible for widespread use without complex digital decoding, and it provides essential visual weather data efficiently from orbit.