GCJ02坐标与WGS84坐标转换
2024-03-18 本文已影响0人
zhuyx0304
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>GCJ02_WGS84</title>
</head>
<body>
<script>
class GCJ02_WGS84 {
static x_pi = 3.14159265358979324 * 3000.0 / 180.0
static pi = 3.1415926535897932384626 //π
static a = 6378245.0 // 长半轴
static ee = 0.00669342162296594323 // 扁率
static wgs84togcj02(lng, lat) {
let dlat = this.transformlat(lng - 105.0, lat - 35.0)
let dlng = this.transformlng(lng - 105.0, lat - 35.0)
let radlat = lat / 180.0 * this.pi
let magic = Math.sin(radlat)
magic = 1 - this.ee * magic * magic
let sqrtmagic = Math.sqrt(magic)
dlat = (dlat * 180.0) / ((this.a * (1 - this.ee)) / (magic * sqrtmagic) * this.pi)
dlng = (dlng * 180.0) / (this.a / sqrtmagic * Math.cos(radlat) * this.pi)
let mglat = lat + dlat
let mglng = lng + dlng
return [mglng, mglat]
}
static gcj02towgs84(lng, lat) {
// GCJ02(火星坐标系) 转GPS84: param lng: 火星坐标系的经度: param lat: 火星坐标系纬度: return :
let dlat = this.transformlat(lng - 105.0, lat - 35.0)
let dlng = this.transformlng(lng - 105.0, lat - 35.0)
let radlat = lat / 180.0 * this.pi
let magic = Math.sin(radlat)
magic = 1 - this.ee * magic * magic
let sqrtmagic = Math.sqrt(magic)
dlat = (dlat * 180.0) / ((this.a * (1 - this.ee)) / (magic * sqrtmagic) * this.pi)
dlng = (dlng * 180.0) / (this.a / sqrtmagic * Math.cos(radlat) * this.pi)
let mglat = lat + dlat
let mglng = lng + dlng
return [lng * 2 - mglng, lat * 2 - mglat]
}
static transformlat(lng, lat) {
let ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng))
ret += (20.0 * Math.sin(6.0 * lng * this.pi) + 20.0 * Math.sin(2.0 * lng * this.pi)) * 2.0 / 3.0
ret += (20.0 * Math.sin(lat * this.pi) + 40.0 * Math.sin(lat / 3.0 * this.pi)) * 2.0 / 3.0
ret += (160.0 * Math.sin(lat / 12.0 * this.pi) + 320 * Math.sin(lat * this.pi / 30.0)) * 2.0 / 3.0
return ret
}
static transformlng(lng, lat) {
let ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng))
ret += (20.0 * Math.sin(6.0 * lng * this.pi) + 20.0 *
Math.sin(2.0 * lng * this.pi)) * 2.0 / 3.0
ret += (20.0 * Math.sin(lng * this.pi) + 40.0 *
Math.sin(lng / 3.0 * this.pi)) * 2.0 / 3.0
ret += (150.0 * Math.sin(lng / 12.0 * this.pi) + 300.0 *
Math.sin(lng / 30.0 * this.pi)) * 2.0 / 3.0
return ret
}
}
let gcj02towgs84 = GCJ02_WGS84.gcj02towgs84(116.397477, 39.908692)
console.log('gcj02towgs84', gcj02towgs84)
let wgs84togcj02= GCJ02_WGS84.wgs84togcj02(116.39123343289631, 39.9072885060602)
console.log('wgs84togcj02', wgs84togcj02)
</script>
</body>
</html>
