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距離を近似式で求めるJavaScriptの関数を作ってみました。 現在地と近い順に並べたりするのに使うのであれば、この程度の精度でも良いのではないかと思います。
//calcDistance(緯度1, 経度1, 緯度2, 経度2) //2点間の距離(km)を近似式で求めます。 //x に紀伊田辺駅(33.733058, 135.384144)と串本駅(33.475527, 135.781603)の距離を求める場合 //x = calcDistance(33.733058, 135.384144, 33.475527, 135.781603); function calcDistance(n1, t1, n2, t2) { var r = 3.1415926535 / 180; n1 *= r; t1 *= r; n1 -= ((11.55 / 60) * r) * Math.sin(2 * n1); n2 *= r; t2 *= r; n2 -= ((11.55 / 60) * r) * Math.sin(2 * n2); var c = Math.cos(n1) * Math.cos(n2) * Math.cos(t1 - t2) + Math.sin(n1) * Math.sin(n2); return Math.atan2(Math.sqrt(1 - c * c), c) * 6369; }
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距離を近似式で求めるJavaScriptの関数を作ってみました。
現在地と近い順に並べたりするのに使うのであれば、この程度の精度でも良いのではないかと思います。
The text was updated successfully, but these errors were encountered: