Question

我想获得汽车跑道上各个点的速度限制。但是我得到的不是一个值，而是两个：FROM_REF_SPEED_LIMIT和TO_REF_SPEED_LIMIT。这些是什么意思？没有关于这些属性的文档。如何使用它们来获取速度限制？实际上，这个地方的速度限制是40公里/小时。

import requests

t = [(55.662026, 37.773537),
     (55.661813, 37.774049)]

s = ""

for x in t:
    s += ' <trkpt lat="' + str(x[0]) + '" lon="' + str(x[1]) + '"/> '

s1 = '<?xml version="1.0"?> <gpx version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/0" xsi:schemaLocation="http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd"> <trk>  <trkseg>  ' + s +'</trkseg></trk></gpx>'

resp = requests.post('http://rme.cit.api.here.com/2/matchroute.json?routemode=carHOV&attributes=SPEED_LIMITS_FCn%28FROM_REF_SPEED_LIMIT,TO_REF_SPEED_LIMIT%29&app_id=iqZ08RnLQHOCQUYqwZ&app_code=oWWPJv9pVx9Y2DdIBBOA', data=s1)
print(resp.text)

响应：

{
    "MapVersion": "LATEST",
    "RouteLinks": [
        {
            "attributes": {
                "SPEED_LIMITS_FCN": [
                    {
                        "FROM_REF_SPEED_LIMIT": "20",
                        "TO_REF_SPEED_LIMIT": "60"
                    }
                ]
            },
            "confidence": 0.94,
            "functionalClass": 3,
            "linkId": -1154810237,
            "linkLength": 50.75,
            "mSecToReachLinkFromStart": 3501,
            "offset": 0.42156,
            "shape": "55.66226 37.77328 55.66212 37.77352 55.66195 37.77387"
        },
        {
            "attributes": {
                "SPEED_LIMITS_FCN": [
                    {
                        "FROM_REF_SPEED_LIMIT": "20",
                        "TO_REF_SPEED_LIMIT": "60"
                    }
                ]
            },
            "confidence": 0.95,
            "functionalClass": 3,
            "linkId": -1154810236,
            "linkLength": 58.13,
            "mSecToReachLinkFromStart": 6403,
            "offset": 0.69481,
            "shape": "55.66195 37.77387 55.66179 37.77431 55.66168 37.77466"
        }
    ],
    "TracePoints": [
        {
            "confidenceValue": 0.5,
            "elevation": 0.0,
            "headingDegreeNorthClockwise": 10000.0,
            "headingMatched": 131.0,
            "lat": 55.662026,
            "latMatched": 55.66208,
            "linkIdMatched": -1154810237,
            "lon": 37.773537,
            "lonMatched": 37.77361,
            "matchDistance": 10.0,
            "matchOffsetOnLink": 0.42156269739402924,
            "minError": 7.0,
            "routeLinkSeqNrMatched": 0,
            "speedMps": 0.0,
            "timestamp": 0
        },
        {
            "confidenceValue": 0.58,
            "elevation": 0.0,
            "headingDegreeNorthClockwise": 10000.0,
            "headingMatched": 123.0,
            "lat": 55.661813,
            "latMatched": 55.66186,
            "linkIdMatched": -1154810236,
            "lon": 37.774049,
            "lonMatched": 37.77411,
            "matchDistance": 8.59,
            "matchOffsetOnLink": 0.69481133508979,
            "minError": 7.0,
            "routeLinkSeqNrMatched": 1,
            "speedMps": 0.0,
            "timestamp": 0
        }
    ],
    "Warnings": []
}

Answer 1

该链接在其地图数据中的每个方向都有两个不同的速度限制。如果发布的速度限制有误，可以将其报告给https://mapcreator.here.com。现在，我们来看看它。请检查所附图片。谢谢！

了解FROM_REF_SPEED_LIMIT和TO_REF_SPEED_LIMIT属性

1 个答案: