網路演算元件對於地理資訊系統(Geographic Information System, GIS)之應用甚為重要。最短路徑演算法(Shortest Path Algorithms)是網路分析的基礎工具,常做為其他更複雜網路問題演算法的基本求解元件。最短路徑演算法應用在GIS時,可能因路網結構的複雜度而影響到運算時間;為了能在較短的時間內求得最短路徑,有效率的演算法是不可或缺的。本研究選擇Dijkstra及Two-tree兩種演算法為基礎,並針對A-star搜尋法與上述兩種演算法之結合進行實證測試。由於A The Shortest Path Algorithm (SPA) is a very important element and tool for solving various network optimization problems. The network analysis objects are frequently applied on the Geographic Information System (GIS), which provides many functions to stor