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地理教育 &軟體工具 廖泫銘 on 17 四月 2011 09:21 上午

繪製大圓線(Great Circle)

地理課曾教過大圓線(Great Circle) 是連接球面上兩點最短的路徑所在的曲線,因為地球是球體,所以兩點之間,最短距離不是直線,而是大圓線,一般而言飛機時為了節省時間與油耗,也都會盡量採取依照大圓線來飛行。

雖然概念很簡單,不過要自己繪製大圓線時會遭遇到一些困難,主要是球體三角函數比較複雜,有興趣者可以參考:http://williams.best.vwh.net/avform.htm#GCF

如果是地理課教學上應用,可以運用GPS Visualizer網站所提供的工具”Calculate the great circle distance between two points”,輸入兩地經、緯度座標,就可以輕鬆地計算出兩點之間最短距離與繪製出大圓線段。

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