百度地图 坐标偏移、覆盖物偏移解决方案

百度地图定位不准确，这个问题困扰我一整天，想来度娘是强大的，各种查询总于找到解决方案，其实就是将经纬度转换为百度地图识别的经纬度，是不是很扯。

网址

http://developer.baidu.com/map/jsdemo/demo/convertor.js     这是单个坐标转换接口

http://developer.baidu.com/map/jsdemo/demo/changeMore.js   这是批量转换接口

1，单个转换函数：

//2011-7-25  (function(){        //闭包  function load_script(xyUrl, callback){      var head = document.getElementsByTagName('head')[0];      var script = document.createElement('script');      script.type = 'text/javascript';      script.src = xyUrl;      //借鉴了jQuery的script跨域方法      script.onload = script.onreadystatechange = function(){          if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){              callback && callback();              // Handle memory leak in IE              script.onload = script.onreadystatechange = null;              if ( head && script.parentNode ) {                  head.removeChild( script );              }          }      };      // Use insertBefore instead of appendChild  to circumvent an IE6 bug.      head.insertBefore( script, head.firstChild );  }  function translate(point,type,callback){      var callbackName = 'cbk_' + Math.round(Math.random() * 10000);    //随机函数名      var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from="+ type + "&to=4&x=" + point.lng + "&y=" + point.lat + "&callback=BMap.Convertor." + callbackName;      //动态创建script标签      load_script(xyUrl);      BMap.Convertor[callbackName] = function(xyResult){          delete BMap.Convertor[callbackName];    //调用完需要删除改函数          var point = new BMap.Point(xyResult.x, xyResult.y);          callback && callback(point);      }  }    window.BMap = window.BMap || {};  BMap.Convertor = {};  BMap.Convertor.translate = translate;  })();  

2，批量转换函数

//2011-7-25 zhangying  (function(){  function load_script(xyUrl, callback){      var head = document.getElementsByTagName('head')[0];      var script = document.createElement('script');      script.type = 'text/javascript';      script.src = xyUrl;      //借鉴了jQuery的script跨域方法      script.onload = script.onreadystatechange = function(){          if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){              callback && callback();              // Handle memory leak in IE              script.onload = script.onreadystatechange = null;              if ( head && script.parentNode ) {                  head.removeChild( script );              }          }      };      // Use insertBefore instead of appendChild  to circumvent an IE6 bug.      head.insertBefore( script, head.firstChild );  }  function transMore(points,type,callback){      var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from=" + type + "&to=4&mode=1";      var xs = [];      var ys = [];      var maxCnt = 20;//每次发送的最大个数      var send = function(){          var url = xyUrl + "&x=" + xs.join(",") + "&y=" + ys.join(",") + "&callback=callback";          //动态创建script标签          load_script(url);          xs = [];          ys = [];      }      for(var index in points){          if(index % maxCnt == 0 && index != 0){              send();          }          xs.push(points[index].lng);          ys.push(points[index].lat);          if(index == points.length - 1){              send();          }      }        }    window.BMap = window.BMap || {};  BMap.Convertor = {};  BMap.Convertor.transMore = transMore;  })();  

3，单个转换函数与批量转换函数 整合体

(function(){        //闭包  function load_script(xyUrl, callback){      var head = document.getElementsByTagName('head')[0];      var script = document.createElement('script');      script.type = 'text/javascript';      script.src = xyUrl;      //借鉴了jQuery的script跨域方法      script.onload = script.onreadystatechange = function(){          if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){              callback && callback();              // Handle memory leak in IE              script.onload = script.onreadystatechange = null;              if ( head && script.parentNode ) {                  head.removeChild( script );              }          }      };      // Use insertBefore instead of appendChild  to circumvent an IE6 bug.      head.insertBefore( script, head.firstChild );  }    function translate(point,type,callback){//单个转换      var callbackName = 'cbk_' + Math.round(Math.random() * 10000);    //随机函数名      var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from="+ type + "&to=4&x=" + point.lng + "&y=" + point.lat + "&callback=BMap.Convertor." + callbackName;      //动态创建script标签      load_script(xyUrl);      BMap.Convertor[callbackName] = function(xyResult){          delete BMap.Convertor[callbackName];    //调用完需要删除改函数          var point = new BMap.Point(xyResult.x, xyResult.y);          callback && callback(point);      };  }    function transMore(points,type,callback){//批量转换      var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from=" + type + "&to=4&mode=1";      var xs = [];      var ys = [];      var maxCnt = 30;//每次发送的最大个数      var send = function(){          var url = xyUrl + "&x=" + xs.join(",") + "&y=" + ys.join(",") + "&callback=callback";          //动态创建script标签          load_script(url);          xs = [];          ys = [];      };      for(var index in points){          if(index % maxCnt == 0 && index != 0){              send();          }          xs.push(points[index].lng);          ys.push(points[index].lat);          if(index == points.length - 1){              send();          }      }        }    window.BMap = window.BMap || {};  BMap.Convertor = {};  BMap.Convertor.translate = translate;  BMap.Convertor.transMore = transMore;  })(); 

另外附上两个接口使用的示例源代码

单个转换的接口

[javascript] view plain copy

1. <!DOCTYPE html>  
2. <html>  
3. <head>  
4. <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
5. <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />  
6. <style type="text/css">  
7. body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;}  
8. </style>  
9. <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script>  
10. <script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/convertor.js"></script>  
11. <title>GPS转百度</title>  
12. </head>  
13. <body>  
14. <div id="allmap"></div>  
15. </body>  
16. </html>  
17. <script type="text/javascript">  
18.   
19. // 百度地图API功能  
20. //GPS坐标  
21. var xx = 116.397428;  
22. var yy = 39.90923;  
23. var gpsPoint = new BMap.Point(xx,yy);  
24.   
25. //地图初始化  
26. var bm = new BMap.Map("allmap");  
27. bm.centerAndZoom(gpsPoint, 15);  
28. bm.addControl(new BMap.NavigationControl());  
29.   
30. //添加谷歌marker和label  
31. var markergps = new BMap.Marker(gpsPoint);  
32. bm.addOverlay(markergps); //添加GPS标注  
33. var labelgps = new BMap.Label("我是GPS标注哦",{offset:new BMap.Size(20,-10)});  
34. markergps.setLabel(labelgps); //添加GPS标注  
35.   
36. //坐标转换完之后的回调函数  
37. translateCallback = function (point){  
38.     var marker = new BMap.Marker(point);  
39.     bm.addOverlay(marker);  
40.     var label = new BMap.Label("我是百度标注哦",{offset:new BMap.Size(20,-10)});  
41.     marker.setLabel(label); //添加百度label  
42.     bm.setCenter(point);  
43.     alert(point.lng + "," + point.lat);  
44. }  
45.   
46. setTimeout(function(){  
47.     BMap.Convertor.translate(gpsPoint,0,translateCallback);     //真实经纬度转成百度坐标  
48. }, 2000);  
49. </script>  

批量转换的示例接口

[javascript] view plain copy

1. <!DOCTYPE html>  
2. <html>  
3. <head>  
4. <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
5. <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />  
6. <style type="text/css">  
7. body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;}  
8. </style>  
9. <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script>  
10. <script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/changeMore.js"></script>  
11. <title>批量坐标转换</title>  
12. </head>  
13. <body>  
14. <div id="allmap"></div>  
15. </body>  
16. </html>  
17. <script type="text/javascript">  
18.   
19. // 百度地图API功能  
20. var map = new BMap.Map("allmap");  
21. map.centerAndZoom(new BMap.Point(116.404, 39.915), 15);  
22. var i;  
23. var markers = [];  
24. map.addEventListener("click",function(e){  
25.     alert(e.point.lng + "," + e.point.lat);  
26. });  
27. //注意：百度和谷歌的经纬度坐标顺序是相反的。  
28. var points = [new BMap.Point(116.3786889372559,39.90762965106183),  
29.               new BMap.Point(116.38632786853032,39.90795884517671),  
30.               new BMap.Point(116.39534009082035,39.907432133833574),  
31.               new BMap.Point(116.40624058825688,39.90789300648029),  
32.               new BMap.Point(116.41413701159672,39.90795884517671)  
33.              ];  
34. function callback(xyResults){  
35.  var xyResult = null;  
36.  for(var index in xyResults){  
37.   xyResult = xyResults[index];  
38.   if(xyResult.error != 0){continue;}//出错就直接返回;  
39.   var point = new BMap.Point(xyResult.x, xyResult.y);  
40.      var marker = new BMap.Marker(point);  
41.      map.addOverlay(marker);  
42.      map.setCenter(point);// 由于写了这句，每一个被设置的点都是中心点的过程  
43.     }  
44. }  
45.   
46. setTimeout(function(){  
47.     BMap.Convertor.transMore(points,2,callback);        //一秒之后开始进行坐标转换。参数2，表示是从GCJ-02坐标到百度坐标。参数0，表示是从GPS到百度坐标  
48. }, 1000);  
49. </script>  

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