Question

我正在尝试从此处api获取历史流量数据。我不确定我在R中是否具有正确的离开格式才能检索数据。我想要加利福尼亚的交通数据，但我居住在不同的州。

call <- paste0("https://route.api.here.com/routing/7.2/calculateroute.json",
               "?app_id=","",
               "&app_code=","",
               "&waypoint0=geo!",34.13336,",",-117.416456,
               "&waypoint1=geo!",33.727436,",",-117.784915,
              "&mode=fastest;truck;traffic:enabled;",
               "&departure=","2018-12-13T03:58:00-07")
              



  #Testing URL Connection
GET(call)


response <-fromJSON(call, simplify = FALSE )
str(response)


  
#}
# parse response and get transit time
travel_time <- response[[1]]$route[[1]]$summary$travelTime

Answer 1

您的问题有点含糊。让我们这样回答：

是的，时间格式正确。如果您选择在早上出发的时间，那么您将会有更多的流量，例如

https://route.api.here.com/routing/7.2/calculateroute.json?app_id=yyy&app_code=xxx&waypoint0=geo!34.13336,-117.416456&waypoint1=geo!33.727436,-117.784915&mode=fastest;truck;traffic:enabled;&departure=2018-12-14T09:58:00-07

您还将获得更长的旅行时间：

"summary": {
        "distance": 73128,
        "trafficTime": 3974,
        "baseTime": 3737,
        "flags": ["tollroad", "noThroughRoad", "motorway", "builtUpArea", "privateRoad"],
        "text": "The trip takes <span class=\"length\">73.1 km</span> and <span class=\"time\">1:06 h</span>.",
        "travelTime": 3974,
        "_type": "RouteSummaryType"
      }

一个一般性评论，请不要在任何论坛中发布您的凭据。以后再添加一些占位符即可。

R中的离开格式

1 个答案: