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一直从事气象预报、服务建模实践应用。注重气象物理场、实况场、地理信息、本体知识库、分布式气象内容管理系统建立。对Barnes客观分析, 小波,计算神经网络、信任传播、贝叶斯推理、专家系统、网络本体语言有一定体会。一直使用Java、Delphi、Prolog、SQL编程。

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计算两点间间距的平方

2014-08-02 09:54:41| 分类： Scala | 标签： |举报 |字号大中小订阅

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import Math.{cos, PI,sqrt,abs }
def deg2km_Distance(lon1: Double, lat1: Double, lon2: Double, lat2: Double) = {
    val dAvgLat = (lat1 + lat2) / 2.0 * PI / 180.0
    val dKmx = abs(lon2 - lon1) / 1000.0 * ((111415.1 * cos(dAvgLat)) - (94.54999 * cos(3.0 * dAvgLat)) - (0.12 * cos(5.0d * dAvgLat)))
    val dKmy = abs(lat2 - lat1) / 1000.0 * (111132.1 - (566.05 * cos(2.0d * dAvgLat)) + (1.2 * cos(4.0d * dAvgLat)) - (0.003d * cos(6.0d * dAvgLat)))
    (dKmx,dKmy)
}
def sqr(x: Double) = x * x
def get_r2(lon1: Double, lat1: Double, lon2: Double, lat2: Double) = {
    val dist_km = deg2km_Distance(lon1,lat1,lon2,lat2)
    sqr(dist_km._1) + sqr(dist_km._2)
}

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