首先说，API的有效期不知道有多长～

http://api.map.baidu.com/?qt=rgc&x=12953722.17&y=4837205.83&dis_poi=100&poi_num=10&ie=utf-8&oue=1&res=api
http://maps.google.com/maps/api/geocode/json?latlng=39.910093,116.403945&language=zh-CN&sensor=false

其中，百度地图的坐标做了转换，网上有百度坐标和Google坐标转换的方法，收集了两个

1,http://www.71j.cn/archives/311

2,https://github.com/no2key/baiducoordinateconverter/blob/master/BaiduCoordinateConverter.class.php
[php]
<?php

$p1 = new spBaiduPointLL(116.301934,39.977552);
var_dump($p1->toMC()->toArray(), $p1->toMC()->toLL()->toArray());

/**
* Baidu地图用坐标转换工具
* 适用于 Baidu地图 Web版接口调用、Baidu地图 JS SDK接口调用。
*
* @author sskaje
* @link http://api.map.baidu.com/getscript?v=1.3&key=&services=&t=20121127154746
*/

/**
* 百度坐标点基类
*
*/
abstract class spBaiduPoint
{
public $lng;
public $lat;
public function __construct($lng, $lat)
{

}
/**
* 坐标转数组
* [0]->longitute, [1]->latitute
*
* @return array
*/
public function toArray()
{
return array($this->lng, $this->lat);
}
}
/**
* 百度地图坐标点类 标准经纬度
*
*/
class spBaiduPointLL extends spBaiduPoint
{
const LONGITUTE_MAX = 180;
const LONGITUTE_MIN = -180;
const LATITUTE_MAX = 74;
const LATITUTE_MIN = -74;

public function __construct($lng, $lat)
{
$this->lng = $this->filterLongitute($lng);
$this->lat = $this->filterLatitute($lat);
}

public function getRadians()
{
return array(
spBaiduCoordinateConverter::toRadians($this->lng),
spBaiduCoordinateConverter::toRadians($this->lat),
);
}

static public function filterLatitute($lat)
{
$lat = max($lat, self::LATITUTE_MIN);
$lat = min($lat, self::LATITUTE_MAX);
return $lat;
}
static public function filterLongitute($lng)
{
while ($lng > self::LONGITUTE_MAX) {
$lng -= self::LONGITUTE_MAX – self::LONGITUTE_MIN;
}
while ($lng < self::LONGITUTE_MIN) {
$lng += self::LONGITUTE_MAX – self::LONGITUTE_MIN;
}
return $lng;
}
/**
* 转 MC 坐标
* @return spBaiduPointMC
*/
public function toMC()
{
return spBaiduCoordinateConverter::convertLL2MC($this);
}
}

/**
* 百度地图坐标点类 MC经纬度
* MC是个神马？
*
*/
class spBaiduPointMC extends spBaiduPoint
{
public function __construct($lng, $lat)
{
$this->lng = $lng;
$this->lat = $lat;
}
/**
* 转 标准经纬坐标
* @return spBaiduPointMC
*/
public function toLL()
{
return spBaiduCoordinateConverter::convertMC2LL($this);
}
}
/**
* 百度地图坐标点转换工具类
*
*/
class spBaiduCoordinateConverter
{
static public $EARTHRADIUS = 6370996.81;
static public $MCBAND = array(
12890594.86, 8362377.87, 5591021, 3481989.83, 1678043.12, 0
);
static public $LLBAND = array(
75, 60, 45, 30, 15, 0
);
static public $MC2LL = array(
array(1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2),
array(-7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86),
array(-3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616, 59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908, -3.29883767235584, 0.32710905363475, 6856817.37),
array(-1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591, 40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06),
array(3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4),
array(2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5)
);
static public $LL2MC = array(
array(-0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340, 26112667856603880, -35149669176653700, 26595700718403920, -10725012454188240, 1800819912950474, 82.5),
array(0.0008277824516172526, 111320.7020463578, 647795574.6671607, -4082003173.641316, 10774905663.51142, -15171875531.51559, 12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5),
array(0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662, 79682215.47186455, -115964993.2797253, 97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5),
array(0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245, 992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312, 144416.9293806241, 37.5),
array(-0.0003441963504368392, 111320.7020576856, 278.2353980772752, 2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5),
array(-0.0003218135878613132, 111320.7020701615, 0.00369383431289, 823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199, 8.77738589078284, 0.37238884252424, 7.45)
);

static public function toRadians($T)
{
return M_PI * $T / 180;
}
static public function toDegrees($T)
{
return (180 * $T) / M_PI;
}
static public function getDistance(spBaiduPointLL $p1, spBaiduPointLL $p2)
{
$p1r = $p1->getRadians();
$p2r = $p2->getRadians();
return self::$EARTHRADIUS * acos((sin($p1r[1]) * sin($p2r[1]) + cos($p1r[1]) * cos($p2r[1]) * cos($p2r[0] – $p1r[0])));
}

static public function getDistanceByMC(spBaiduPointMC $p1, spBaiduPointMC $p2)
{
return self::getDistance($p1->toLL(), $p2->toLL());
}
static public function getDistanceByLL(spBaiduPointLL $p1, spBaiduPointLL $p2)
{
return this.getDistance($p1, $p2);
}
static public function convertMC2LL(spBaiduPointMC $point)
{
$np = new spBaiduPointMC(abs($point->lng), abs($point->lat));
$cM = array();
for ($cL = 0; $cL < count(self::$MCBAND); $cL++) {
if ($np->lat >= self::$MCBAND[$cL]) {
$cM = self::$MC2LL[$cL];
break;
}
}

$T = self::convertor($np, $cM);
return new spBaiduPointLL(round($T[0], 6), round($T[1],6));
}
static public function convertLL2MC(spBaiduPointLL $point)
{
$cL = array();
for ($cK = 0; $cK < count(self::$LLBAND); $cK++) {
if ($point->lat >= self::$LLBAND[$cK]) {
$cL = self::$LL2MC[$cK];
break;
}
}

if (!$cL) {
for ($cK = count(self::$LLBAND) – 1; $cK >= 0; $cK–) {
if ($point->lat <= -self::$LLBAND[$cK]) {
$cL = self::$LL2MC[$cK];
break;
}
}
}
$cM = self::convertor($point, $cL);
return new spBaiduPointMC(round($cM[0], 2), round($cM[1], 2));
}

static public function convertor(spBaiduPoint $cK, array $cL)
{
$T = $cL[0] + $cL[1] * abs($cK->lng);
$cJ = abs($cK->lat) / $cL[9];
$cM = $cL[2] + $cL[3] * $cJ + $cL[4] * $cJ * $cJ + $cL[5] * $cJ * $cJ * $cJ + $cL[6] * $cJ * $cJ * $cJ * $cJ + $cL[7] * $cJ * $cJ * $cJ * $cJ * $cJ + $cL[8] * $cJ * $cJ * $cJ * $cJ * $cJ * $cJ;
$T *= ($cK->lng < 0 ? -1 : 1);
$cM *= ($cK->lat < 0 ? -1 : 1);
return array($T, $cM);
}
}

# EOF
[/php]