百度地图转换接口API要点

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1、baidu经纬度坐标与google经纬度坐标都是经过转换的。

2、原始坐标到baidu的坐标的转换根据http://api.map.baidu.com/ag/coord/convert?from=0&to=4&x=116.308992&y=40.059225，将得到的base64字符还原就是真实的经纬度。

其中，from和to对应的值分别是：0真实坐标；2google坐标；4baidu坐标。

后附一些方法：

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<script type="text/javascript" src="changeMore.js"></script>
<title>批量转换坐标</title>
</head>
<body>
<input onclick="magic();" value="批量转换" type="button" />（据说有50次/秒的限制哦）<hr />
<div style="clear:both">
<div style="float:left;">
<h4>谷歌地图</h4>
<div style="width:520px;height:340px;border:1px solid gray" id="map_canvas"></div>
<p>鼠标点击的谷歌坐标是：<span id="info"></span></p>
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
function initialize() {
        var myOptions = {
          zoom: 14,
          center: new google.maps.LatLng(39.90861722866082, 116.39679921252446),
          mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        var map = new google.maps.Map(document.getElementById('map_canvas'),myOptions);
        google.maps.event.addListener(map, 'click', function(e) {
          document.getElementById("info").innerHTML = e.latLng;
        });
        var marker1 = new google.maps.Marker({
          position: new google.maps.LatLng(39.90762965106183, 116.3786889372559),
          map: map
        });
        var marker2 = new google.maps.Marker({
          position: new google.maps.LatLng(39.90795884517671, 116.38632786853032),
          map: map
        });
        var marker3 = new google.maps.Marker({
          position: new google.maps.LatLng(39.907432133833574, 116.39534009082035),
          map: map
        });
        var marker4 = new google.maps.Marker({
          position: new google.maps.LatLng(39.90789300648029, 116.40624058825688),
          map: map
        });
        var marker5 = new google.maps.Marker({
          position: new google.maps.LatLng(39.90795884517671, 116.41413701159672),
          map: map
        });
      }
      google.maps.event.addDomListener(window, 'load', initialize);
</script>
</div>
<div style="float:left;">
<h4>百度地图</h4>
<div style="width:520px;height:340px;border:1px solid gray" id="container"></div>
<p>鼠标点击的百度坐标是：（<span id="info2"></span>）</p>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=1.2"></script>
<script type="text/javascript">
var map = new BMap.Map("container");
map.centerAndZoom(new BMap.Point(116.404, 39.915), 15);
var i;
var markers = [];
map.addEventListener("click",function(e){
    document.getElementById("info2").innerHTML = e.point.lng + "," + e.point.lat;
});
//注意：百度和谷歌的经纬度坐标顺序是相反的。
var points = [new BMap.Point(116.3786889372559,39.90762965106183),
              new BMap.Point(116.38632786853032,39.90795884517671),
              new BMap.Point(116.39534009082035,39.907432133833574),
              new BMap.Point(116.40624058825688,39.90789300648029),
              new BMap.Point(116.41413701159672,39.90795884517671)
             ];
function callback(xyResult){ 
    if(xyResult.error != 0){return;}//出错就直接返回;
    var point = new BMap.Point(xyResult.x, xyResult.y);
    var marker = new BMap.Marker(point);
    map.addOverlay(marker);
    map.setCenter(point);// 由于写了这句，可以每一个被转的点都是中心点的过程
}
function magic(){
    BMap.Convertor.transMore(points,2,callback);
}
</script>
</div>
</div>
</body>
</html>

//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){
    for(var index in points){
        if(index > 50){return;}
        var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from=" + type + 
        "&to=4&x=" + points[index].lng + //这里要循环读入数组points的lng数据，直到points.length完毕。
        "&y=" + points[index].lat + 
        "&callback=callback";
        //动态创建script标签
        load_script(xyUrl);
    }
}

window.BMap = window.BMap || {};
BMap.Convertor = {};
BMap.Convertor.transMore = transMore;
})();

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