JS实现GPS坐标转化为高德坐标

1、GPS坐标转化为高德坐标代码

var GPS = {
  PI: 3.14159265358979324,
  x_pi: 3.14159265358979324 * 3000.0 / 180.0,

  transformLat: function(x, y) {
    var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x))
    ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0
    ret += (20.0 * Math.sin(y * this.PI) + 40.0 * Math.sin(y / 3.0 * this.PI)) * 2.0 / 3.0
    ret += (160.0 * Math.sin(y / 12.0 * this.PI) + 320 * Math.sin(y * this.PI / 30.0)) * 2.0 / 3.0
    return ret
  },
  transformLon: function(x, y) {
    var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x))
    ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0
    ret += (20.0 * Math.sin(x * this.PI) + 40.0 * Math.sin(x / 3.0 * this.PI)) * 2.0 / 3.0
    ret += (150.0 * Math.sin(x / 12.0 * this.PI) + 300.0 * Math.sin(x / 30.0 * this.PI)) * 2.0 / 3.0
    return ret
  },
  // 坐标转换
  delta: function(lat, lon) {
    var a = 6378245.0 //  a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
    var ee = 0.00669342162296594323 //  ee: 椭球的偏心率。
    var dLat = this.transformLat(lon - 105.0, lat - 35.0)
    var dLon = this.transformLon(lon - 105.0, lat - 35.0)
    var radLat = lat / 180.0 * this.PI
    var magic = Math.sin(radLat)
    magic = 1 - ee * magic * magic
    var sqrtMagic = Math.sqrt(magic)
    dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * this.PI)
    dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * this.PI)
    return { 'lat': dLat, 'lon': dLon }
  },
  // 判断是否为国外坐标
  outOfChina: function(lat, lon) {
    if (lon < 72.004 || lon > 137.8347) { return true }
    if (lat < 0.8293 || lat > 55.8271) { return true }
    return false
  },
  // GPS---高德
  gcj_encrypt: function(wgsLat, wgsLon) {
    if (this.outOfChina(wgsLat, wgsLon)) { return { 'lat': wgsLat, 'lon': wgsLon } }

    var d = this.delta(wgsLat, wgsLon)
    return { 'lat': wgsLat + d.lat, 'lon': wgsLon + d.lon }
  }
}

export default GPS
           

2、使用方法

  在需要的页面引入

import GPS from '@/utils/gpstoGD'           

方法调用

// 注意传递的经纬度坐标要是数值型

const mark = GPS.gcj_encrypt(
                Number(item.latitude),
                Number(item.longitude)
              )
  console.log(mark)