HERE Isoline Routing v8 response structure

The Response JSON object consists of:

A departure or arrival describing the origin or destination details provided in the request.
An array of isolines.

Each isoline in the isolines array has the following parameters:

A range for which the isoline was generated.
A list of polygon elements, each of which are an array of geo-coordinates defining the boundary of the isolines.
A connection list which identifies which polygons are connected and the shape of the connection. For an example of where connections can occur, see Isoline with multiple components.

The array of geo-coordinates in the polygons and the shape of the connections between the polygons are encoded using Flexible Polyline. Examples in the linked repository show how polylines can be decoded in some of the commonly used programming languages.

The decoded polyline will be a series of coordinates that you can use to render the isolines, for example using the HERE Maps API for Javascript. To learn more, see the Polyline on the map example.

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Note
A different departureTime or arrivalTime will have various effects ranging from different traffic impact to road closures. If you specify departureTime as any, the route calculation will not take time-dependent information into account, with the exception of long-term closures. Long-term closures (that is, current closures that last for more than a day) will still be considered. departureTime=any is often referred to as "planning mode", and can be useful when the departure or arrival time of the route are not known in advance. Note that sending the same request with the parameter departureTime=any at different times may result in different responses.

Example

curl -gX GET 'https://isoline.router.hereapi.com/v8/isolines?'\
'transportMode=car&'\
'origin=52.5308,13.3847&'\
'range[type]=distance&'\
'range[values]=3000&'\
'apiKey=YOUR_API_KEY'

Response:

{
  "departure": {
    "place": {
      "type": "place",
      "location": {
        "lat": 52.5309797,
        "lng": 13.3845615
      },
      "originalLocation": {
        "lat": 52.5307999,
        "lng": 13.3847
      }
    }
  },
  "isolines": [
    {
      "range": {
        "type": "distance",
        "value": 3000
      },
      "polygons": [
        {
          "outer": "BGmk9lkDo7tuZAqmF2KmgBsgCuV4KmgBA-qB4KmgBmgB2K8qBAmgB4KwVsgCuVAuVrgCwVA2KmgBA-qB4KmgBsgCuV4KmgB3KmgB9qB-qBrgCuVx2Gy2G3KmgB4KmgBuVuV4KmgBA-qB4KmgBuVuV4KmgBA-qB2KmgB-qB-qBuVAo2En2EsgCtVAtVvVvV1KlgBA7qB2KlgBmgB3KmgB4KwVsgCuVA61C71CAtVtVtVvVrgCtVvV1KlgBA7qB2KlgBsgCtVuVvVwVAuVwVsgCuV4KmgBA61C2K-qBwVuV2KtVAx2G4KlgBmgB3KmgB4KuVsgCsgCuV4KmgBA8qB4KmgBmgB4KmgB3K2KlgBA51C4KlgBmgB1KmgB2K4KmgBA-qB2KmgBsgCuVwVsgCuVA2KlgBA9qB4KlgBuVA-qB-qBuVsgCwVAuVrgC61C51CwVA2KmgBA8qB1KmgBvVwVAuVwVuVAwVrgCuV3KmgBA61C4KmgBuVAuVtVwVA2KmgBAy2G4KmgBuVwV4KmgB3KmgBtVuVtVsgCvVuVAmgBmgBmgBmgBAsgCrgCmgB3KmgB4K4KmgBA-qB3KmgBrgCuV1KmgBA61C3KmgBtVAvVrgClgB1KlgB2K1KmgBA-qB2KmgB-qB-qBsgCuV4KmgBA61C3KmgBtVArgCrgCvVA1KmgB2KmgBwVwVuVqgCsgCsgC4KmgBA-qB3KmgBlgB4KlgB3KtVrgClgB3K9qBAlgB1K3KlgB4KlgBuVvVAtVlgB3KlgB4K7qB-qBvVsgCtVuVAuVuVwVwVsgC61C61CuVAwVrgCmgB3KmgB4K2KmgBA61C1KmgBvVwVAuVwVuVuVsgCuVAwVrgC8qB7qBwVA2KmgBA8qB1KmgBvVwVtVsgCtVuV3KmgBA61C4KmgBuVuV4KmgB3KmgBtVwVAuVuVuV4KmgBA-qB3KmgBrgCuV51C81C3KmgBA61C4KmgBuVuV4KmgB3KmgBtVuVAwVuVuVAuVtVwVvVsgCtVuV3KmgBA61C1KmgBlgB4KlgB3K3KlgBA51C3KlgBtVAtVuVrgCwVtVuVrgCuVvVwVrgCuV1KmgBA2rF2KmgBsgCuV4KmgB3KmgBtVuVtVsgCvVuV1KmgB2KmgBmgB4K81CAmgB4K2KmgB1KmgBrgCuVAuVsgCsgC2KmgB1KmgBlgB4KlgB3KrgCrgCvVA1KmgBA-qB2KmgBwVuV2KmgBA-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-qB-qBuVsgCwVA2KlgBA9qB1KlgBvVtV1KlgBA9qB3KlgBtVtV3KlgBA9qB3KlgBtVA3KmgBA-qB1KmgBlgB2KlgB1K9qB9qBtVrgCvVAtVuVtVAvVrgCtVtVtVrgCprDnrDtVrgCprDprD1KlgBA9qB3KlgBrgCtV3KlgB4KlgBsgCrgCuVrgCsgCrgC4KlgBA51C4KlgBsgCtVAvVvVtV1KlgB2KlgBmgB3K81CAkgB1KAvVpgCtV3KlgB4KlgBqgCtV-qB9qB4KlgBA51C2KlgBmgB3K-qBAmgB3KAtVtVtV3KlgBA1rF4KlgBmgB1KmgB2K2KmgBAy2G4KmgBuVA4KlgBAthI3KlgB7qB9qBlgB3K71CAlgB4KtVuVrgCwVtVuVlgB4KlgB3K3KlgBA9qB4KlgBmgB1K-qBAkgB3KwVtVmgB3K4gEAmgB3KuVtVmgB3KmgB4K4KmgBA-qB2KmgBsgCuVwVuVmgB4KmgB3K2KlgBA51C4KlgBuVtVAvVtVtV3KlgBA9qB4KlgBuVAwVwVuVA4KlgBA3gE3KlgBlgB3K9qBAlgB1KtVrgCrgCvV3KlgBAvhI1KlgBlgB1KlgB2KvVsgClgB4KlgB3K1KlgB2KlgBwVtV2KlgB1KlgBvVtV1KlgBA9qB2KlgBwVAorDqrDwVA8qB9qB4KlgBA3gE4KlgBsgCrgC2KlgBA7qB4KlgBmgB3K-qBAmgB4KuVuVuVA4KlgB3KlgBrgCtV1KlgB2KlgBmgB3K-qBAmgB3K2KlgBA7qB4KlgB-qB9qBuVrF4KkQA6a"
        }
      ]
    }
  ]
}

The isoline can be decoded and rendered on a map as seen in the following image: Example decoded and rendered isoline