Digital map generator and display system

摘要

In a digital information storage and read-out system, digital elevation and cultural terrain map data is read from a magnetic tape (10) in compressed form into an intermediate memory (20) which operates as a speed buffer memory. The data in the intermediate memory (20) is read out to a reconstruction processor (30) in which the compressed data is reconstructed and applied to a scene memory (35). A navigation computer (100) determines the instantaneous position of a vehicle with respect to the terrain and controls the over-writing of data into the scene memory (35) in blocks no longer required for storage of data at sites from which the vehicle has moved away. In order to provide a heading up display of the terrain, the data in the scene memory is read out at an angle to its north- up storage orientation by means of an address directory in read-control (40). The data read out of the scene memory controls the generation of video control signals to effect a display of the elevation and cultural data as a moving map related to the vehicle position.