谷歌地图API和duration_in_traffic

Question

我正在努力理解DistanceMatrix API。当我在浏览器上这样做时：

https://maps.googleapis.com/maps/api/distancematrix/json?origins=14.614786，121.046587&目的地=14.6103301121.080233&mode=驾驶&language=en&departure_time=现在&key=MY_key

我得到了duration_in_traffic。

{
"destination_addresses" : [
"17 Orchard Rd, Bagumbayan, Quezon City, 1109 Metro Manila, Philippines"
],
"origin_addresses" : [ "74 C. Benitez St, Quezon City, Metro Manila, Philippines" ],
"rows" : [
{
"elements" : [
{
"distance" : {
"text" : "8.5 km",
"value" : 8470
},
"duration" : {
"text" : "23 mins",
"value" : 1406
},
"duration_in_traffic" : {
"text" : "35 mins",
"value" : 2112
},
"status" : "OK"
}
]
}
],
"status" : "OK"
}

但是当我有它在golang使用地图API

我没有得到duration_in_traffic，只返回空

r := &maps.DistanceMatrixRequest{
Language:      *language,
DepartureTime: "now",
ArrivalTime:   *arrivalTime,
}

以下是结果

{
"origin_addresses": [
"74 C. Benitez St, Quezon City, Metro Manila, Philippines"
],
"destination_addresses": [
"17 Orchard Rd, Bagumbayan, Quezon City, 1109 Metro Manila, Philippines"
],
"rows": [
{
"elements": [
{
"status": "OK",
"distance": {
"text": "8.5 km",
"value": 8470
},
"duration": {
"value": 1406,
"text": "23m26s"
},
"duration_in_traffic": null
}
]
}
]
}

我做错了什么？

编辑：

r := &maps.DistanceMatrixRequest{
Origins:       strings.Split(origins, "|"),
Destinations:  strings.Split(destinations, "|"),
Language:      "en",
DepartureTime: "now",
Mode:          maps.TravelModeDriving,
Units:         maps.UnitsMetric,
}
resp, err := client.DistanceMatrix(context.Background(), r)
if err != nil {
return c.JSON(http.StatusBadRequest, err)
}
return c.JSON(http.StatusOK, resp)

Answer 1

遇到了和你相同的问题，对你帖子的编辑解决了我的问题。

为了向稍后可能出现的任何人澄清解决方案，问题是我没有在请求中指定DepartureTime。

如果在DepartureTime被注释掉的情况下运行以下代码，它将打印：

go run traffic.go 
Duration in minutes: 0.000000

但在请求中指定了DepartureTime: "now"后，它会给出：

go run traffic.go 
Duration in minutes: 135.966667

以下是完整的工作示例。

package main
import (
"fmt"
"log"
"golang.org/x/net/context"
"googlemaps.github.io/maps"
)
func main() {
c, err := maps.NewClient(maps.WithAPIKey("my-api-key-here"))
if err != nil {
log.Fatalf("fatal error: %s", err)
}
r := &maps.DistanceMatrixRequest{
Origins:      []string{"Newark, DE"},
Destinations: []string{"Charles Town, WV"},
Units:        maps.UnitsImperial,
Language:     "en",
// Must specify DepartureTime in order to get DurationInTraffic in response
DepartureTime: "now",
}
route, err := c.DistanceMatrix(context.Background(), r)
if err != nil {
log.Fatalf("fatal error: %s", err)
}
fmt.Printf("Duration in minutes: %fn", route.Rows[0].Elements[0].DurationInTraffic.Minutes())
}

Answer 2

另一个潜在的问题是，如果谷歌没有流量数据，它不会返回duration_in_traffic。

文件状态：

只有在以下所有情况下，才会返回流量中的持续时间true：

The request includes a departure_time parameter.
The request includes a valid API key, or a valid Google Maps Platform Premium Plan client ID and signature.
Traffic conditions are available for the requested route.
The mode parameter is set to driving.