Google方向API爲TrafficModel返回不正確的值

Question

根據谷歌API文檔，所有流量模型應該有不同的值，但我得到了BEST_GUESS，PESSIMISTIC，OPTIMISTIC的相同值。

我使用下面的代碼

//Source address 
$a = 'Los Angeles International Airport, 1 World Way, Los Angeles, CA 90045, United States'; 
//Destination address 
$b = 'Beverly Wilshire, Beverly Hills (A Four Seasons Hotel), 9500 Wilshire Boulevard, Beverly Hills, CA 90212, United 
     States'; 
//Pass source and destination address in google map API for PESSIMISTIC 
$url = 'https://maps.googleapis.com/maps/api/directions/xml?origin='. urlencode($a).'&destination='. urlencode($b).'&departure_time=1451491810&travelMode=google.maps.TravelMode.DRIVING&drivingOptions=trafficModel:google.maps.TrafficModel.PESSIMISTIC&key=AIzaSyC7h7m5bRs-BZwk0XTXEQTB74dZujeLzZs'; 
//output: duration_in_traffic = 50 mins 

//Pass source and destination address in google map API for OPTIMISTIC 
$url = 'https://maps.googleapis.com/maps/api/directions/xml?origin='. urlencode($a).'&destination='. urlencode($b).'&departure_time=1451491810&travelMode=google.maps.TravelMode.DRIVING&drivingOptions=trafficModel:google.maps.TrafficModel.OPTIMISTIC&key=AIzaSyC7h7m5bRs-BZwk0XTXEQTB74dZujeLzZs'; 
//output: duration_in_traffic = 50 mins 

//Pass source and destination address in google map API for BEST_GUESS 
$url = 'https://maps.googleapis.com/maps/api/directions/xml?origin='. urlencode($a).'&destination='. urlencode($b).'&departure_time=1451491810&travelMode=google.maps.TravelMode.DRIVING&drivingOptions=trafficModel:google.maps.TrafficModel.BEST_GUESS&key=AIzaSyC7h7m5bRs-BZwk0XTXEQTB74dZujeLzZs'; 
    //output: duration_in_traffic = 50 mins 

更新：

我使用

// DEPARTURE_TIME = 04一月-2016 // 1451898000

$url = 'https://maps.googleapis.com/maps/api/directions/xml?origin='. urlencode($a).'&destination='. urlencode($b).'&departure_time=1451898000&mode=driving&traffic_model=pessimistic&key=AIzaSyC7h7m5bRs-BZwk0XTXEQTB74dZujeLzZs'; 

//Output 

pessimistic==>> 
duration_in_traffic => 31 mins 

optimistic==> 
duration_in_traffic => 25 mins 

best_guess==> 
duration_in_traffic => 25 mins 

Above responses are not correct as per the live google map 

https://www.google.com/maps/dir/Los+Angeles+International+Airport,+1+World+Way,+Los+Angeles,+CA+90045,+United+States/Beverly+Hills,+CA/@34.0077875,-118.4878535,12z/data=!3m1!4b1!4m17!4m16!1m5!1m1!1s0x80c2b0d213b24fb5:0x77a87b57698badf1!2m2!1d-118.40853!2d33.9415889!1m5!1m1!1s0x80c2bc04d6d147ab:0xd6c7c379fd081ed1!2m2!1d-118.4003563!2d34.0736204!2m3!6e0!7e2!8j1451898000 

我究竟做錯了什麼？

Answer 1

您部分使用Javascript-API的參數，但必須使用參數the webservice。

1.

travelMode=google.maps.TravelMode.DRIVING 

應該

mode=driving 

（你可以忽略它，它的默認值）

2.

drivingOptions=trafficModel:google.maps.TrafficModel.[value] 

必須

traffic_model=[value] 

其中[value]可以是best_guess，optimistic或pessimistic

---

所以$url應該例如是

$url = 'https://maps.googleapis.com/maps/api/directions/xml?origin='. urlencode($a).'&destination='. urlencode($b).'&departure_time=1451491810&mode=driving&traffic_model=pessimistic&key=AIzaSyC7h7m5bRs-BZwk0XTXEQTB74dZujeLzZs'; 

pessimistic duration_in_traffic =1小時19分鐘

optimistic duration_in_traffic = 28分鐘

best_guess duration_in_traffic = 50分鐘