# Application of Augmented Reality in Waterway Traffic Management Using Sparse Spatiotemporal Data
## 3 Intelligent Navigation Marker System
### Design for Intelligent Waterway Services  
The intelligent navigation marker system enables the implementation of advanced waterway perception technology, offering more comprehensive and efficient services to vessels navigating the waterway. Vessels in transit require real-time and accurate waterway information, such as water flow, weather conditions, and navigation warnings, to ensure safe passage. Traditional information services may suffer from delays and fail to meet the immediate needs of vessels. The intelligent navigation marker integrates various sensors and communication technologies, enabling real-time data collection and processing, and it delivers services to vessels through VHF broadcasting. This system primarily gathers waterway information through three modules.  
1. Multi-Camera System  
The multi-camera system is a crucial perception module within the intelligent navigation marker system. It is capable of identifying and tracking vessels on the waterway while capturing dynamic changes. In dense and complex environments, the system significantly improves vessel detection and tracking accuracy by integrating data from multiple perspectives.  
2. AIS Receiver Device  
The AIS reception module is a core component of the intelligent navigation marker system, playing a critical role in vessel dynamic monitoring and traffic management. This module receives and decodes signals transmitted from nearby vessels in real time, extracting key information such as the position, speed, heading, and vessel type. Such information is essential for assessing vessel distribution, speed, and relative position within the waterway, enabling the early prediction of potential navigation conflicts and collision risks.  
3. Hydrological Information Receiver Device  
The hydrological information reception module is equally crucial for waterway environment perception, particularly in dynamic environments where weather and hydrological conditions fluctuate significantly. This module receives and analyzes real-time hydrological data, such as water levels, flow rates, and tidal changes, providing vessels with accurate information regarding navigational conditions. Hydrological data are vital for ensuring safe navigation, especially under conditions of high flow rates or low water levels, where vessels must adjust their navigation plans based on real-time data.  
By leveraging the multi-camera system, hydrological and meteorological detection modules, and the automatic identification system (AIS), the intelligent navigation marker can collect real-time environmental data and vessel dynamic behavior information along the waterway. The marker monitors waterway conditions through cameras and the AIS system, identifying and tracking vessels and other objects. By integrating multiple data sources, it combines visual data and AIS information, enabling more precise traffic situation awareness concerning the waterway. Additionally, the marker can receive and analyze weather data, providing vessels with timely weather updates and navigation warnings.