天地图路径规划功能实现

1、天地图路径规划

天地图Web服务API为用户提供HTTP/HTTPS接口，即开发者可以通过这些接口使用各类型的地理信息数据服务，可以基于此开发跨平台的地理信息应用。

Web服务API对所有用户开放。使用本组服务之前，需要申请key。

Web服务API主要包括：

1. 地名搜索
2. 公交规划
3. 地理编码查询
4. 逆地理编码查询
5. 行政区划
6. 静态地图

2、路径规划

天地图的路径规划分为公交规划和驾车规划。
公交规划是根据输入起点和终点查询公交地铁规划线路；驾车规划是根据输入起点、终点和途经点规划查询驾车路线。

3、参数说明

请求地址：
http://api.tianditu.gov.cn/transit?type=busline&postStr={“startposition”:“116.427562,39.939677”,“endposition”:“116.349329,39.939132”,“linetype”:“1”}&tk=您的密钥

请求参数：

返参说明：

{
  "hasSubway": false,
  "results": [
    {
      "lineType": 1,
      "lines": [
        {
          "segments": [
            {
              "segmentLine": [
                {
                  "segmentStationCount": 5,
                  "segmentTime": 12,
                  "segmentTransferTime": 0,
                  "segmentDistance": 7918.4817954727,
                  "direction": "地铁２号线",
                  "SEndTime": "05:09-05:09",
                  "linePoint": "116.427562,39.939677;116.427547,39.940035;116.427536,39.940306;116.427508,39.940957;116.427486,39.942151;116.427481,39.942689;116.427527,39.944165;
                  116.427553,39.945593;116.427485,39.946255;116.427314,39.946746;116.427057,39.947109;116.426736,39.947445;116.426528,39.947664;
                  116.426385,39.947746;116.426357,39.947759;116.426281,39.947804;116.426212,39.947841;116.426084,39.947906;116.425675,39.948091;
                  116.425111,39.948252;116.424669,39.948321;116.42386,39.948351;116.423438,39.948336;116.421594,39.948275;116.420773,39.948253;
                  116.420388,39.94824;116.419674,39.948215;
                  116.419567,39.948213;116.419234,39.948206;116.419098,39.9482;116.418705,39.948188;116.418298,39.948177;116.414176,39.94803;
                  116.412771,39.947979;116.411824,39.947944;116.411533,39.947934;116.411377,39.947928;116.410184,39.947893;116.409805,39.94788;
                  116.408928,39.947849;116.408676,39.947843;
                  116.408099,39.947823;116.406412,39.947757;116.405055,39.947721;116.403359,39.947682;116.402437,39.947679;116.402017,39.947679;
                  116.401864,39.947679;116.401573,39.947673;116.400766,39.947664;116.397375,39.94764;116.396188,39.947627;
                  116.395136,39.947622;116.39367,39.947611;116.392413,39.947595;
                  116.391331,39.947584;116.39111,39.947584;116.390344,39.947583;116.389325,39.947585;
                  116.389238,39.947585;116.388289,39.947578;116.38772,39.947574;116.387518,39.947572;116.387297,39.947569;116.385611,39.947549;116.382967,39.947551;
                  116.379847,39.947517;116.377827,39.947498;116.374749,39.947482;
                  116.37377,39.947479;116.373714,39.947479;116.373647,39.947479;116.372799,39.947467;116.372688,39.947467;116.371245,39.947454;116.371045,39.947452;
                  116.369336,39.947445;116.366827,39.94732;116.365823,39.947255;116.364864,39.947117;116.364357,39.947005;116.363154,39.94666;116.359446,39.945161;
                  116.357039,39.94441;116.351092,39.942766;116.350575,39.942531;116.350176,39.942249;116.349555,39.941349;116.349349,39.940875;116.349282,39.940389;116.349329,39.939132;",
                  "lineName": "地铁２号线",
                  "byuuid": "23213"
                }
              ],
              "stationEnd": {
                "lonlat": "116.349329,39.939132",
                "name": "西直门站",
                "uuid": "133057"
              },
              "segmentType": 3,
              "stationStart": {
                "lonlat": "116.427562,39.939677",
                "name": "东直门站",
                "uuid": "133017"
              }
            }
          ],
          "lineName": "地铁２号线 |"
        }
      ]
    }
  ],
  "resultCode": 0
}

4、Demo

以Android端为例，利用天地图Web服务实现路径规划。
起点：116.4341,39.9337
终点：116.4778,39.9226
执行代码，在地图上加载的结果如下：返回了4条线路分别为：
线路1：
线路2：
线路3：
线路4：