百度与谷歌坐标互换.html

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	<title>Document</title>
	<script type="text/javascript">
		//BD-09 坐标转换成 GCJ-02 坐标
function bd_decrypt(bd_lat, bd_lon)
{
    var x = bd_lon - 0.0065, y = bd_lat - 0.006;
    var z = this.sqrt(x * x + y * y) - 0.00002 * this.sin(y * this.pi);
    var theta = this.atan2(y, x) - 0.000003 * this.cos(x * this.pi);
    var gg_lon = z * this.cos(theta);
    var gg_lat = z * this.sin(theta);
    return [gg_lat, gg_lon];
}

//GCJ-02 坐标转换成 BD-09 坐标
function bd_encrypt(gg_lat, gg_lon)
{
    var x = gg_lon, y = gg_lat;
    var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * Math.pi);
    var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * Math.pi);
    var bd_lon = z * Math.cos(theta) + 0.0065;
    var bd_lat = z * Math.sin(theta) + 0.006;
    return [bd_lat, bd_lon];
}
	</script>
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