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Early warning system in aeronautical chart becomes one of important issues when it comes to low- altitude airspace management. Aeronautical chart visualization technology can be widely used in obstacle avoidance, security alarming, etc. This article firstly discusses current flight safety situation in low-altitude airspace, and then describes key technologies of realizing visualization in aeronautical chart for early warning, including collecting multi-source data, ground information survey, plotting digital aeronautical chart, constructing of visualization terrain models and building early warning system. Lastly, this article analyzes relevant research tendency and future development in this field.

Research Progress in Visualized Aeronautical Chart for Early Warning of Low-Altitude Flight