如何找到 Google 地图 API 最短路线，如 Google 地图路线所示

Question

我在获取最短路线时遇到了问题。问题是 google 地图中显示的距离与 google.maps.DirectionsService() 获得的最短路线之间存在差异；我也得到了替代路线，但仍然与地图上显示的距离不匹配.. enter image description here

地图中显示的距离为 15 公里，但 google.maps.DirectionsService() 的最短路线为 18.3 公里我想获得地图中显示的距离，如我所附的图像所示。代码...

       directionsService.route(request, function(response, status) {
           if (status === 'OK') {
               let route_options = [];
               for (var i = 0; i < response.routes.length; i++)
               {
                   let route = response.routes[i];
                   let distance = 0;
                   // Total the legs to find the overall journey distance for each route option
                   for (var j = 0; j < route.legs.length; j++)
                   {
                       distance += route.legs[j].distance.value; // metres
                   }
                   route_options.push({
                       'route_id': i,
                       'distance': distance
                   });
               }
               route_options.sort(function(a, b) {
                   return parseInt(a.distance) - parseInt(b.distance);
               });
               let duration = response.routes[0].legs[0].duration.value;
               let shortest_distance = (route_options[0]['distance'] * 0.001); // convert metres to kilometres


              return shortest_distance;
           }
       });
   }

Answer 1

您的代码实现中的其他地方可能存在您尚未发布的问题，因为您共享的代码 returns 与 Google 地图的距离相同。

请看一下这个jsfiddle based off of Google's example进行演示。请按照以下步骤操作：
1. Select "Frankfurt Airport (FRA) (FRA), Frankfurt, Germany" 作为原点
2. Select "Frankfurt Marriott Hotel, Hamburger Allee, Frankfurt, Germany" 作为目的地
3. Select "Driving" 模式

控制台输出：

distance.text: 15.0 km
distance.value: 14.988
shortest_distance: 14.988

相关代码如下：

  function(response, status) {
    if (status === 'OK') {
      let route_options = [];
      for (var i = 0; i < response.routes.length; i++) {
        let route = response.routes[i];
        let distance = 0;
        // Total the legs to find the overall journey distance for each route option
        for (var j = 0; j < route.legs.length; j++) {
          distance += route.legs[j].distance.value; // metres
        }
        route_options.push({
          'route_id': i,
          'distance': distance
        });
      }
      route_options.sort(function(a, b) {
        return parseInt(a.distance) - parseInt(b.distance);
      });
      let duration = response.routes[0].legs[0].duration.value;
      let shortest_distance = (route_options[0]['distance'] * 0.001); // convert metres to kilometres

      console.log("distance.text: " + response.routes[0].legs[0].distance.text);
      console.log("distance.value: " + response.routes[0].legs[0].distance.value * 0.001);
      console.log("shortest_distance: " + shortest_distance);

      me.directionsRenderer.setDirections(response);
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });

希望对您有所帮助！

如何找到 Google 地图 API 最短路线，如 Google 地图路线所示

How to find Google Map API Shortest route as Shown in Google map Route

javascript

google-maps

directions

google-directions-api

map-api