JS实现GPS坐标转化为高德坐标

发布于:2022-08-24 10:55:20


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


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)


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