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here-api - 如何查找 Here Maps 链接 ID 的几何形状/形状

问题描述

我有一个 Here Maps 链接 ID 的列表。我想得到他们的几何形状。我尝试调用 v7 calculateroute REST API，在 waypoint0 和 waypoint1 中传递一个 link_id，如下所示，

https://route.ls.hereapi.com/routing/7.2/calculateroute.json?apiKey={API_KEY}&mode=fastest;car&waypoint0=link!-893783351&waypoint1=link!-893783351&routeAttributes=notes&linkAttributes=shape,speedLimit

{
    "response": {
        "metaInfo": {
            "timestamp": "2021-09-28T04:03:39Z",
            "mapVersion": "8.30.124.155",
            "moduleVersion": "7.2.202138-9419",
            "interfaceVersion": "2.6.77",
            "availableMapVersion": [
                "8.30.124.155"
            ]
        },
        "route": [
            {
                "waypoint": [
                    {
                        "linkId": "+893783351",
                        "mappedPosition": {
                            "latitude": 26.711034,
                            "longitude": -80.1374786
                        },
                        "originalPosition": {
                            "latitude": 26.711034,
                            "longitude": -80.1374786
                        },
                        "type": "stopOver",
                        "spot": 0.4929245,
                        "sideOfStreet": "neither",
                        "mappedRoadName": "",
                        "label": "",
                        "shapeIndex": 0,
                        "source": "user"
                    },
                    {
                        "linkId": "+893783351",
                        "mappedPosition": {
                            "latitude": 26.711034,
                            "longitude": -80.1374786
                        },
                        "originalPosition": {
                            "latitude": 26.711034,
                            "longitude": -80.1374786
                        },
                        "type": "stopOver",
                        "spot": 0.4929245,
                        "sideOfStreet": "neither",
                        "mappedRoadName": "",
                        "label": "",
                        "shapeIndex": 1,
                        "source": "user"
                    }
                ],
                "mode": {
                    "type": "fastest",
                    "transportModes": [
                        "car"
                    ],
                    "trafficMode": "disabled",
                    "feature": []
                },
                "shape": [
                    "26.711034,-80.1374786",
                    "26.711034,-80.1374786"
                ],
                "leg": [
                    {
                        "start": {
                            "linkId": "+893783351",
                            "mappedPosition": {
                                "latitude": 26.711034,
                                "longitude": -80.1374786
                            },
                            "originalPosition": {
                                "latitude": 26.711034,
                                "longitude": -80.1374786
                            },
                            "type": "stopOver",
                            "spot": 0.4929245,
                            "sideOfStreet": "neither",
                            "mappedRoadName": "",
                            "label": "",
                            "shapeIndex": 0,
                            "source": "user"
                        },
                        "end": {
                            "linkId": "+893783351",
                            "mappedPosition": {
                                "latitude": 26.711034,
                                "longitude": -80.1374786
                            },
                            "originalPosition": {
                                "latitude": 26.711034,
                                "longitude": -80.1374786
                            },
                            "type": "stopOver",
                            "spot": 0.4929245,
                            "sideOfStreet": "neither",
                            "mappedRoadName": "",
                            "label": "",
                            "shapeIndex": 1,
                            "source": "user"
                        },
                        "length": 0,
                        "travelTime": 0,
                        "maneuver": [
                            {
                                "position": {
                                    "latitude": 26.711034,
                                    "longitude": -80.1374786
                                },
                                "instruction": "Take ramp.",
                                "travelTime": 0,
                                "length": 0,
                                "id": "M1",
                                "_type": "PrivateTransportManeuverType"
                            },
                            {
                                "position": {
                                    "latitude": 26.711034,
                                    "longitude": -80.1374786
                                },
                                "instruction": "Arrive at your destination.",
                                "travelTime": 0,
                                "length": 0,
                                "id": "M2",
                                "_type": "PrivateTransportManeuverType"
                            }
                        ]
                    }
                ],
                "note": [
                    {
                        "type": "violation",
                        "code": "routingOptionViolated",
                        "text": "startDirection"
                    }
                ],
                "summary": {
                    "distance": 0,
                    "trafficTime": 0,
                    "baseTime": 0,
                    "flags": [
                        "tollroad"
                    ],
                    "text": "The trip takes <span class=\"length\">0 m</span> and less than <span class=\"time\">1 min</span>.",
                    "travelTime": 0,
                    "_type": "RouteSummaryType"
                }
            }
        ],
        "language": "en-us"
    }
}

但是响应中返回的形状似乎不是链接的形状，即使开发人员指南提到参数“linkAttributes”可以用于获取链接形状。

如果我在这里做错了什么，请告知。另外，如果我可以使用另一个 API 来获得链接的形状。

我可以根据 link_id 进行 API 调用。

标签： here-apihere-maps-restheremapshere-routing

解决方案

航路点用于定义路线必须经过的地图上的位置。航路点可以是 StopOver（例如，起点或目的地）或 PassThrough。一个有效的 CalculateRoute 请求必须包含至少两个 StopOver 航路点。为路线分配航路点的三种方法

  1. 粗略的定位：GeoWaypointParameterType
  2. 对街道的引用：带有 StreetPositions 的 NavigationWaypointParameter
  3. 对链接的精确引用：带有 LinkPositions 的 NavigationWaypointParameter

详细信息可以在这里找到： https ://developer.here.com/documentation/routing/dev_guide/topics/resource-param-type-waypoint.html#resource-param-type-waypoint__geo-waypoint

让我专注于第三点，因为您使用的是链接位置。请注意，NavigationWaypointParameter 通过 LinkId 和可选的 Spot 值定义航点。Spot 定义为从链接的参考节点到非参考节点的小数距离，其值介于 0 和 1 之间。当请求中未提供 Spot 值或 DisplayPosition 时，假定默认值 0.5

航点的可选显示位置定义了该位置在地图上的显示位置。它表示位置的中心并且不可导航，与位置的导航位置相比，它不位于路由网络中的链路上。显示位置允许路由引擎决定航路点是位于路线的左侧还是右侧。

这是文档中的示例：

// using exact link information with display position and spot:
&waypoint0=link!37.7914050,-122.3987030!-743460791,0.8996

// using exact link information with display position and spot and additional stopover delay of 5 minutes:
&waypoint0=link!stopOver,300!37.7914050,-122.3987030!-743460791,0.8996

// the display position is optional:
&waypoint0=link!!-743460795,0.1342
&waypoint0=link!-743460795,0.1342

// using user label:
&waypoint0=link!37.7914050,-122.3987030;My Home!-743460791,0.8996

// using user label without display position:
&waypoint1=link!;My Work!-743460795

// link traveled in any direction:
&waypoint0=link!*743460795

由于请求中的链接参数对于航点 0 和航点 1 相同，因此仅返回该点。但是，如果您设置点例如，链接将显示如下： https://refclient.ext.here.com/#url=https://route.api.here.com/routing/7.2/calculateroute。 json?routeattributes=sh,gr&mode=fastest;car&maneuverattributes=po,ti,pt,ac,di,fj,ix&language=en-us&jsonattributes=41&metricsystem=metric&waypoint0=link!stopOver!-893783351,0.1342&waypoint1=link!stopOver!-893783351&app_code =kg72HCGA7Um5GdCdXRp5mw&app_id=wkkI0nFlieJAZT1KrbpW

在此处输入图像描述

但是，如果您正在寻找特定于链接 ID 的详细信息，您可以使用 PDE 请求，如下所述： https ://tcs.ext.here.com/examples/v3/pde_get_any_link_info

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