A Dynamic Symbol Plotting Method Based on Multi-scale Visualization

Effective and accurate visualization of large-scale dot-plotting symbols is a research hotpot in cartography. In this paper, we proposed a large-scale dynamic target plotting method based on multi-scale visualization, firstly, we used variable length Geohash coding to establish an organization model for dynamic plotting symbols to query the spatial location of dynamic objects and the objects in the adjacent space more efficiently. Additionally, we used the improved circle growth algorithm and the improved square root rule model to visual the ploted symbols with different semantics to realised the visualization method based on dynamic LOD. Eventually, we used the asynchronous communication and dynamic cache mechanism of data to further improve the visualization efficiency of the algorithm. Experiments show that this visualization method can significantly improve the visualization effect and efficiency of dynamic symbols, and can make the dynamic symbol visualization process show superior performance.