scala计算两个经纬度坐标的距离

import org.junit.Test

/**
  * Created by wzq on 17-8-7.
  */
class Meter {
  @Test
  def run: Unit ={
    println(getDistance(10,112,12,120))
  }

  private val EARTH_RADIUS: Double = 6378.137

  private def rad(d: Double): Double = d * Math.PI / 180.0

  /**
    * 通过经纬度获取距离(单位：米)
    *
    * @param lat1
    * @param lng1
    * @param lat2
    * @param lng2
    * @return
    */
  def getDistance(lat1: Double, lng1: Double, lat2: Double, lng2: Double): Double = {
    val radLat1: Double = rad(lat1)
    val radLat2: Double = rad(lat2)
    val a: Double = radLat1 - radLat2
    val b: Double = rad(lng1) - rad(lng2)
    var s: Double = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)))
    s = s * EARTH_RADIUS
    s = s * 10000d.round / 10000d
    s = s * 1000
    s
  }

}