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web 端地图坐标系转换（涉及到百度，高德，WGS84，GCJ02）

首先说下经纬度，在工作中经常有同事搞混经纬度，调用方法的时候也经常写反，再加上一大堆坐标系，导致后续工作混乱

经度(Lng)：116.397428，在中国是经度大于纬度

纬度（Lat）:39.90923

注意：

国家测绘局规定，中国互联网地图必须使用至少加密一次的 GCJ-02 坐标。故高德不提供任何坐标系转换为 GPS 坐标的接口，请知晓。

根据相关法律规定，百度不支持将任何一种坐标系坐标转换为 wgs84 类型。

百度坐标系介绍，BD09

以下两种分别是 JavaScript API 和 Android 地图 SDK API，说到的坐标系方面的知识，都是大同小异的，可以总结如下：

http://lbsyun.baidu.com/index.php?title=jspopular/guide/coorinfo

http://lbsyun.baidu.com/index.php?title=androidsdk/guide/tool/coordinate

国内主流坐标系类型主要有以下三种

  1. WGS84：为一种大地坐标系，也是目前广泛使用的 GPS 全球卫星定位系统使用的坐标系；简称（WGS84 坐标）
  2. GCJ02：是由中国国家测绘局制订的地理信息系统的坐标系统，是由 WGS84 坐标系经加密后的坐标系；简称（国测局坐标）
  3. BD09：百度坐标系，在 GCJ02 坐标系基础上再次加密。其中 BD09ll 表示百度经纬度坐标，BD09mc 表示百度墨卡托米制坐标。简称（百度坐标） 在海外地区，统一使用 WGS84 坐标。开发者在使用百度地图相关服务时，请注意选择

百度提供的官方方法是 Convertor 构造函数，里面有一个 translate 方法，提供了 from,to 参数，意思就是从一个坐标系转到另一个坐标系，其中 from，to 的定义如下

baidu

其中，3 代表 google,soso 地图、aliyun 地图、mapabc 地图和 amap 地图所用坐标，国测局坐标，看来百度对坐标的转换是把这几种归为一类，其实 google 坐标系是 wgs84 坐标，国测局是国测局坐标，两个压根不是一个东西，这种转换可能考虑到国家安全的层面，所以在转换上比较简单粗暴。

以下是index_baidu.html展示效果

baidu

高德坐标系介绍，GCJ02

高德地图 API 使用的坐标体系，为国测局规定的 GCJ-02 坐标系，是国内的标准坐标体系。区别于 GPS 坐标（WGS-84 坐标系），是在其基础上进行了一次加密。

引用：https://lbs.amap.com/faq/advisory/others/39838

高德数据来源

  1. 高德地图手机 app 日活接近 3000 万,高德地图 LBS 服务的 30 多万第三方应用也在丰富高德的数据源。
  2. 通过政府交管合作得到的信息，权威性很高，现在在跟近百加交管合作。
  3. 高德地图是阿里巴巴集团旗下的公司，阿里巴巴有运单、外卖单等等数据，也是相当庞大优质的数据来源

高德只提供了以下 3 种坐标转换到高德

  1. gps:GPS 原始坐标；
  2. baidu：百度经纬度；
  3. mapbar：图吧经纬度；

关于高德坐标转换，有各种问题请参考

https://lbs.amap.com/faq/search?s=%E9%AB%98%E5%BE%B7%E5%9D%90%E6%A0%87%E8%BD%AC%E6%8D%A2&faq_type=&page_id=

转换方法参考：

坐标转换 service: https://restapi.amap.com/v3/assistant/coordinate/convert?locations=110.69914997013403,34.70943356436415&coordsys=baidu&output=xml&key=您申请的key

参考： http://lbsbbs.amap.com/forum.php?mod=viewthread&tid=724&extra=page%3D1

https://lbs.amap.com/api/javascript-api/guide/transform/coord_trans

以下是index_gaode.html展示效果

高德

数据

坐标系是纬度在前，经度在后，首尾相接，每个 Point 之间用分号分割的多边形，请复制到文本框中，点击转换按钮，同时提供一个小工具，可以支持前后经纬度转换，经纬度前后转换

第一条多边形 41.80343182084754,123.41714737149174;41.802469398770086,123.41638531717835;41.80069675718447,123.41498506836558;41.802648707294054,123.4104020648181;41.80322861725963,123.40904669614183;41.80324582365427,123.40891115050668;41.80334960825875,123.40807768593105;41.803565422466704,123.40715106887217;41.80412851276868,123.40564363017187;41.805016774641985,123.40353147891388;41.80521765304824,123.40369015772382;41.805395191162916,123.4038286179092;41.80562822631518,123.4040215787217;41.805884654720195,123.40423974280857;41.80612500384948,123.40448396673166;41.80635944402792,123.40473316917259;41.806619488186776,123.40506588617275;41.807030234197725,123.40566247109726;41.80724614854405,123.40599694151764;41.80753730988586,123.40640700101658;41.80778298422714,123.40675454188873;41.80817678424865,123.40729141906723;41.809424709153085,123.40908134285336;41.80981842076106,123.4097794243241;41.8101521720863,123.41038279510083;41.810197948424594,123.41046424158682;41.810324585244445,123.41069147186198;41.81061221723221,123.41120217304172;41.81097186296762,123.41190967394103;41.811467449481796,123.41294741600629;41.81152590539484,123.4130920263635;41.811541493157,123.4131311899679;41.81164289872959,123.4133792184278;41.81198362733205,123.41422053888884;41.81240397876193,123.4153615713019;41.81261148017342,123.41598354160976;41.81266440064208,123.41614202172896;41.81267616067534,123.41617812944074;41.812726168755646,123.4163285746349;41.81274284760333,123.41637771877996;41.81296079031442,123.41705059062907;41.81318209490555,123.41776438484028;41.813415768307685,123.41853310455274;41.81348589474055,123.41876457981185;41.813546163787215,123.4189820020356;41.813678661633084,123.41943483370795;41.81385518839775,123.42021703967302;41.814031370059745,123.421155162196;41.81420940800258,123.422060954938;41.814253564769636,123.42229310929221;41.81364835935844,123.42235954616092;41.81276217927457,123.42225740387846;41.81189638729916,123.42202795582962;41.81111052516046,123.42170333034781;41.81071784151908,123.4215354222985;41.809940909922325,123.4212104511718;41.80767717208085,123.42026037004436;41.807467693864886,123.42013957714698;41.80727013185864,123.41999377271311;41.80640540400433,123.41938006025785;41.80552989439005,123.41870685408315;41.804009892820716,123.41758575717928;41.80343182084754,123.41714737149174

第二条多边形 43.876002332899304,126.56522054036458;43.87611436631944,126.56484429253472;43.87652316623264,126.56419026692708;43.87699137369792,126.56360053168405;43.87618435329861,126.56264133029514;43.87630425347222,126.56234646267362;43.87641221788194,126.56204644097222;43.87668619791667,126.56141845703124;43.87633544921875,126.56109754774306;43.8760142686632,126.56087158203124;43.875774468315974,126.56068332248265;43.875859375,126.56051242404514;43.8759361436632,126.56027642144096;43.87580919053819,126.56021240234377;43.875828179253475,126.55914442274306;43.87531032986111,126.55916042751736;43.875301106770834,126.55813232421876;43.8752783203125,126.5580202907986;43.87527425130208,126.55736029730905;43.87504638671875,126.5573282877604;43.87506239149305,126.55678141276042;43.875209147135415,126.55679144965278;43.876546223958336,126.5568443467882;43.87719618055556,126.55692464192708;43.87758517795139,126.55704264322917;43.87763237847222,126.5559974500868;43.877802191840274,126.55518446180557;43.87783447265625,126.55519449869792;43.87746826171875,126.55501437717014;43.876827256944445,126.55469835069444;43.87642550998264,126.55362548828126;43.87583713107639,126.55263834635416;43.875087076822915,126.55157660590278;43.875026312934025,126.5509334309896;43.875034450954864,126.55070963541668;43.875111219618056,126.55040852864585;43.87512722439236,126.5501513671875;43.87518934461806,126.5498074001736;43.87526611328125,126.54959364149306;43.87525119357639,126.54929253472224;43.87523518880209,126.54909939236111;43.87523518880209,126.54791937934029;43.879947102864584,126.54584635416668;43.87995035807292,126.54631727430557;43.87999620225695,126.5472403971354;43.88007432725694,126.54786241319444;43.880182291666664,126.54861355251737;43.880352376302085,126.54932156032986;43.88047634548611,126.54979329427084;43.8805992296007,126.55028727213542;43.880785319010414,126.55082329644095;43.88098605685764,126.5512744140625;43.88111029730903,126.5516384548611;43.88131130642361,126.55217529296876;43.88143527560763,126.55249755859376;43.88152615017361,126.55271538628472;43.88199028862847,126.5539705403646;43.88246337890625,126.55491455078123;43.88286322699653,126.55546630859376;43.88374131944445,126.55408230251736;43.88475016276042,126.55541259765624;43.886019422743054,126.55355061848958;43.88700900607639,126.55595350477432;43.88694742838542,126.55676947699652;43.88793728298611,126.55878662109374;43.888401150173614,126.56058837890625;43.88864827473958,126.56157552083332;43.89203016493055,126.56204535590278;43.89197726779514,126.56312445746528;43.891803385416665,126.56582628038194;43.89197238498264,126.5686754014757;43.89227213541667,126.57146538628471;43.892399359809026,126.5736404079861;43.89237114800347,126.5744873046875;43.89235812717014,126.57489637586804;43.89224012586806,126.57557237413197;43.89209499782986,126.57720160590276;43.89199028862847,126.57790825737848;43.89176513671875,126.57942843967014;43.88518608940972,126.5788503689236;43.884510091145835,126.57879123263888;43.881450466579864,126.57852240668404;43.881536187065976,126.57624837239584;43.88163628472222,126.57363037109376;43.87887532552083,126.5734304470486;43.87833333333333,126.57339057074653;43.878124186197915,126.5733753797743;43.87637234157986,126.5732484266493;43.87365614149306,126.57305148654514;43.87654839409722,126.5684375;43.87484727647569,126.56830837673613;43.87549126519097,126.56732747395831;43.87517822265625,126.56696234809029;43.875522189670136,126.56639350043405;43.87556640625,126.56639051649306;43.875592176649306,126.566318359375;43.875569118923615,126.56627034

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