爬取百度POI的时候，别人的代码中有提到左下，右上坐标，但是没有说从哪里来，而且还是百度的坐标。
经纬度:左下角,右上角：113.529103,37.444122;115.486183,38.768031
墨卡托坐标:左下角,右上角：12638139.45,4474972.88;12856002.97,4661492.44只需将下面代码复制粘贴到txt文件中，然后修改文件后缀名为.html即可。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;font-family:"微软雅黑";}
#panel{
position:absolute;
left:5px;
top:5px;
}
#result{
background: #fff;
padding:5px;
}
</style>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=1XjLLEhZhQNUzd93EjU5nOGQ"></script>
<title>添加行政区划</title>
</head>
<body>
<div id="allmap"></div>
<div id="panel">
<div>
<input type="text" id="keyword" value="深圳市"/>
<input type="button" value="查看范围" id="commitBtn"/>
边界经纬度坐标
<textarea id="pathStr"></textarea>
边界墨卡托坐标
<textarea id="pathMc"></textarea>
</div>
<div id="result">
</div>
</div>
</body>
</html>
<script type="text/javascript">
// 百度地图API功能
var map = new BMap.Map("allmap");
map.centerAndZoom(new BMap.Point(116.403765, 39.914850), 5);
map.enableScrollWheelZoom();
var mercatorProjection = map.getMapType().getProjection();
$("#commitBtn").bind('click', function(){
getBoundary($("#keyword").val());
});
function getBoundary(city){
var bdary = new BMap.Boundary();
bdary.get(city, function(rs){ //获取行政区域
map.clearOverlays(); //清除地图覆盖物
var count = rs.boundaries.length; //行政区域的点有多少个
if (count === 0) {
alert('未能获取当前输入行政区域');
return ;
}
var pointArray = [];
for (var i = 0; i < count; i++) {
var ply = new BMap.Polygon(rs.boundaries[i], {strokeWeight: 2, strokeColor: "#ff0000"}); //建立多边形覆盖物
map.addOverlay(ply); //添加覆盖物
pointArray = pointArray.concat(ply.getPath());
}
var pathStr = "";
var pathMc = "";
for (var i = 0; i < pointArray.length; i++) {
var mc = mercatorProjection.lngLatToPoint(pointArray[i]);
pathStr += pointArray[i].lng + "," + pointArray[i].lat + ";";
pathMc += mc.x + "," + mc.y + ";";
}
$('#pathStr').html(pathStr);
$('#pathMc').html(pathMc);
var ply = new BMap.Polygon(pointArray , {strokeWeight: 2, strokeColor: "#ff0000"}); //建立多边形覆盖物
var bounds = ply.getBounds();
var ne = bounds.getNorthEast();
var sw = bounds.getSouthWest();
var neMc = mercatorProjection.lngLatToPoint(ne);
var swMc = mercatorProjection.lngLatToPoint(sw);
var str = "经纬度:左下角,右上角：" + sw.lng + "," + sw.lat + ";" + ne.lng + "," + ne.lat
+ "<br/>墨卡托坐标:左下角,右上角：" + swMc.x + "," + swMc.y + ";" + neMc.x + "," + neMc.y;
$('#result').html(str);
console.log(bounds);
map.setViewport(pointArray); //调整视野
});
}
//getBoundary('北京');
</script>html打开乱码问题：
charset=utf-8 已设置
无妨访问/访问没数据：
ak=1XjLLEhZhQNUzd93EjU5nOGQ 这是别人的ak，换成自己百度地图的ak即可。
深圳：
经纬度:左下角,右上角：113.694619,22.40295;114.639114,22.8672
墨卡托坐标:左下角,右上角：12656564.81,2543542.33;12761706.65,2599212.9广州：
经纬度:左下角,右上角：112.965177,22.520712;114.066575,23.939718
墨卡托坐标:左下角,右上角：12575362.81,2557645.8;12697971.21,2728569.49上海：
经纬度:左下角,右上角：120.861562,30.685891;122.141866,31.880513
墨卡托坐标:左下角,右上角：13454393.93,3570017.09;13596918.27,3724861.49北京：
经纬度:左下角,右上角：115.428226,39.449733;117.523446,41.06575
墨卡托坐标:左下角,右上角：12849551.15,4758893.84;13082792.51,4993710.91
参考链接：
Python之爬取百度地图兴趣点（POI）数据
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