【Golang】计算两个地理坐标之间的距离

package mainimport ("fmt""math"
)// 球面距离公式：https://baike.baidu.com/item/%E7%90%83%E9%9D%A2%E8%B7%9D%E7%A6%BB%E5%85%AC%E5%BC%8F/5374455?fr=aladdin
// GeoDistance 计算地理距离，依次为两个坐标的纬度、经度、单位（默认：英里，K => 公里，N => 海里）
func GeoDistance(lng1 float64, lat1 float64, lng2 float64, lat2 float64, unit ...string) float64 {const PI float64 = 3.141592653589793radlat1 := float64(PI * lat1 / 180)radlat2 := float64(PI * lat2 / 180)theta := float64(lng1 - lng2)radtheta := float64(PI * theta / 180)dist := math.Sin(radlat1)*math.Sin(radlat2) + math.Cos(radlat1)*math.Cos(radlat2)*math.Cos(radtheta)if dist > 1 {dist = 1}dist = math.Acos(dist)dist = dist * 180 / PIdist = dist * 60 * 1.1515if len(unit) > 0 {if unit[0] == "K" {dist = dist * 1.609344} else if unit[0] == "N" {dist = dist * 0.8684}}return dist
}func main() {fmt.Printf("%f 公里", GeoDistance(120.090564, 30.344981, 120.11638, 30.2959, "K"))
}

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