geohash算法以及求最邻近区域的点-golang

geohash算法以及求最邻近区域的点,对这两个算法封装成了golang package,写LBS服务程序的时候有用。

https://github.com/gansidui/geohash

https://github.com/gansidui/nearest

gohash

package main
import (
 "fmt"
 "github.com/gansidui/geohash"
)
func main() {
 latitude := 39.92324
 longitude := 116.3906
 precision := 5
 hash, box := geohash.Encode(latitude, longitude, precision)
 fmt.Println(hash)
 fmt.Println(box.MinLat, box.MaxLat, box.MinLng, box.MaxLng)
 neighbors := geohash.GetNeighbors(latitude, longitude, precision)
 for _, hash = range neighbors {
 fmt.Print(hash, " ")
 }
}

nearest

package main
import (
 "fmt"
 "github.com/gansidui/nearest"
)
func main() {
 near := nearest.NewNearest()
 near.SetPrecision(5)
 near.AddCoord("A", 40.92424, 116.3906)
 near.AddCoord("B", 39.93224, 116.3927)
 near.AddCoord("C", 39.92484, 116.3916)
 near.AddCoord("D", 39.92494, 116.3923)
 near.AddCoord("E", 39.92220, 116.3915)
 near.AddCoord("F", 39.92424, 117.3906)
 keys := near.QueryNearestSquareFromKey("C")
 coordNode1, ok := near.GetCoordNode("C")
 if !ok {
 return
 }
 for _, key := range keys {
 coordNode2, _ := near.GetCoordNode(key)
 fmt.Println(key, nearest.DistanceCoordNode(coordNode1, coordNode2))
 }
}

本文来自:开源中国博客

感谢作者:bluezwt

查看原文:geohash算法以及求最邻近区域的点-golang

• 编辑
• 预览