BMap.Convertor在坐标转换上有数量限制,这点在实际的项目中受限。参考网上一些文档,封装了下面js版的坐标转换工具pointtransfertools.js。经测试,误差在可容忍范围之内。
点击下载pointtransfertools.js
pointtransfertools.js代码:
/** * 地图位置计算工具(将GPS坐标转换成百度地图坐标) * 参考文档:http://bbs.lbsyun.baidu.com/forum.php?mod=viewthread&tid=10923&qq-pf-to=pcqq.group * * 使用示例:批量转换坐标位置 * * var transferedData = GpsToBaiduPoints(prePoints); * $.each(transferedData,function(index,point){ * console.log(point); * }); * *-------------------以下是提供的一个简单的访问接口------------------------- * 参数: points:new BMap.Point(lng,lat)的集合 * 返回值:resultPoints:转换后 BMap.point点集 * function GpsToBaiduPoints(points){ * var resultPoints = []; * $.each(points,function(index,point){ * //世界大地坐标转为百度坐标 * var _t = wgs2bd(point.lat,point.lng); * var _BPoint = new BMap.Point(_t[1], _t[0]); * resultPoints.push(_BPoint); * }); * return resultPoints; * } */ //默认提供一个接口直接调用 function GpsToBaiduPoints(points){ var resultPoints = []; $.each(points,function(index,point){ var _t = wgs2bd(point.lat,point.lng); var _BPoint = new BMap.Point(_t[1], _t[0]); resultPoints.push(_BPoint); }); return resultPoints; } ////////////////////////////////////////// //////////////转换核心代码//////////////// ////////////////////////////////////////// var pi = 3.14159265358979324; var a = 6378245.0; var ee = 0.00669342162296594323; var x_pi = 3.14159265358979324*3000.0/180.0; //世界大地坐标转为百度坐标 function wgs2bd(lat,lon) { var wgs2gcjR = wgs2gcj(lat, lon); var gcj2bdR = gcj2bd(wgs2gcjR[0], wgs2gcjR[1]); return gcj2bdR; } function gcj2bd(lat,lon) { var x = lon, y = lat; var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi); var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi); var bd_lon = z * Math.cos(theta) + 0.0065; var bd_lat = z * Math.sin(theta) + 0.006; var result = []; result.push(bd_lat); result.push(bd_lon); return result; } function bd2gcj(lat,lon) { var x = lon - 0.0065, y = lat - 0.006; var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi); var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi); var gg_lon = z * Math.cos(theta); var gg_lat = z * Math.sin(theta); var result = []; result.push(gg_lat); result.push(gg_lon); return result; } function wgs2gcj(lat,lon) { var dLat = transformLat(lon - 105.0, lat - 35.0); var dLon = transformLon(lon - 105.0, lat - 35.0); var radLat = lat / 180.0 * 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) * pi); dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi); var mgLat = lat + dLat; var mgLon = lon + dLon; var result = []; result.push(mgLat); result.push(mgLon); return result; } function transformLat(lat,lon) { var ret = -100.0 + 2.0 * lat + 3.0 * lon + 0.2 * lon * lon + 0.1 * lat * lon + 0.2 * Math.sqrt(Math.abs(lat)); ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi)) * 2.0 / 3.0; ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi / 30.0)) * 2.0 / 3.0; return ret; } function transformLon(lat,lon) { var ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat)); ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0; ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0; return ret; }