Abstract: An apparatus for photographing the ground continuously from an airplane, and for recording the photographed images in digital form in real time. A three-line sensor camera comprising a forward-oblique line sensor, a vertical line sensor and a backward-oblique line sensor is on board. The three-line sensor camera has a gyro integrally connected thereto. Data of the camera's attitude available from the gyro, digital data of the land images available from the camera and data of the airplane's position available from an airborne GPS are recorded and reproduced. The camera is controlled with the aid of the gyro so that its optical axis may be held in a vertical direction at all times.