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. 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 reading of data into the scene memory (35) in blocks with the vehicle position occupying a center of scene location. 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; interlocked scanning of pixel data in the scene memory improves resolution and enhances line display. The data read out of the scene memory controls the generation of video control signals to display elevation and cultural data as a moving map related to the vehicle position.