Mapbox Map Matching API は、GPSの誤差などで道からずれている移動データを道なりにしてくれるAPIです。
https://www.mapbox.com/help/define-map-matching/
調査で使ってみます。
結論から言うと、あまりいいデータになりませんでした。
量が少ないのかな？？
とはいえ、やってみたことをメモとして記録しておきます。
まずは、下記のように横浜駅から弊社への歩きのデータを普通にMap上にポリラインで描画すると、次のようになります。
これを下記のAPIドキュメントを参考にしながらMap MatchingのAPIから結果を取得してみます。
https://www.mapbox.com/api-documentation/#map-matching
結果を取得するURLは次のようになります。
Access Tokenは別途Mapboxで登録して取得してください。
{
"matchings": [
{
"confidence": 2.7299273952507974e-12,
"geometry": "mgnwEavdsYbAH@MVAEcB\\s@R?fA`AgAaAS?]r@YOIPBRBFCICQHQXN\\s@R?\\Z??JHfA`A@V_@v@g@i@GGuAqA\\s@R?h@d@fA`A@V_@v@MOLNATTLFNr@lCPIy@cD|@uBEE{AqAsAzC",
"legs": [
{
"summary": "",
"weight": 139.2,
"duration": 139.2,
"steps": [],
"distance": 193.4
},
{
"summary": "",
"weight": 84,
"duration": 84,
"steps": [],
"distance": 116.6
},
{
"summary": "",
"weight": 6.7,
"duration": 6.7,
"steps": [],
"distance": 9.4
},
{
"summary": "",
"weight": 2.9,
"duration": 2.9,
"steps": [],
"distance": 4
},
{
"summary": "",
"weight": 3.4,
"duration": 3.4,
"steps": [],
"distance": 4.8
},
{
"summary": "",
"weight": 6.2,
"duration": 6.2,
"steps": [],
"distance": 8.6
},
{
"summary": "",
"weight": 62.8,
"duration": 62.8,
"steps": [],
"distance": 87.2
},
{
"summary": "",
"weight": 0,
"duration": 0,
"steps": [],
"distance": 0
},
{
"summary": "",
"weight": 6.1,
"duration": 6.1,
"steps": [],
"distance": 8.5
},
{
"summary": "",
"weight": 88.9,
"duration": 88.9,
"steps": [],
"distance": 120.7
},
{
"summary": "",
"weight": 4,
"duration": 4,
"steps": [],
"distance": 5.5
},
{
"summary": "",
"weight": 92.5,
"duration": 92.5,
"steps": [],
"distance": 128.3
},
{
"summary": "",
"weight": 75.6,
"duration": 75.6,
"steps": [],
"distance": 102.4
},
{
"summary": "",
"weight": 200.3,
"duration": 200.3,
"steps": [],
"distance": 275.4
},
{
"summary": "",
"weight": 106.3,
"duration": 106.3,
"steps": [],
"distance": 147.6
}
],
"weight_name": "duration",
"weight": 878.9000000000001,
"duration": 878.9000000000001,
"distance": 1212.3999999999999
}
],
"tracepoints": [
{
"alternatives_count": 0,
"waypoint_index": 0,
"matchings_index": 0,
"name": "",
"location": [
139.620974,
35.467588
]
},
{
"alternatives_count": 0,
"waypoint_index": 1,
"matchings_index": 0,
"name": "",
"location": [
139.621427,
35.466538
]
},
{
"alternatives_count": 0,
"waypoint_index": 2,
"matchings_index": 0,
"name": "",
"location": [
139.621488,
35.467334
]
},
{
"alternatives_count": 0,
"waypoint_index": 3,
"matchings_index": 0,
"name": "",
"location": [
139.621391,
35.467305
]
},
{
"alternatives_count": 0,
"waypoint_index": 4,
"matchings_index": 0,
"name": "",
"location": [
139.621349,
35.467293
]
},
{
"alternatives_count": 0,
"waypoint_index": 5,
"matchings_index": 0,
"name": "",
"location": [
139.621399,
35.467308
]
},
{
"alternatives_count": 0,
"waypoint_index": 6,
"matchings_index": 0,
"name": "",
"location": [
139.621488,
35.467334
]
},
{
"alternatives_count": 0,
"waypoint_index": 7,
"matchings_index": 0,
"name": "",
"location": [
139.621621,
35.46675
]
},
{
"alternatives_count": 0,
"waypoint_index": 8,
"matchings_index": 0,
"name": "",
"location": [
139.621621,
35.46675
]
},
{
"alternatives_count": 0,
"waypoint_index": 9,
"matchings_index": 0,
"name": "",
"location": [
139.621565,
35.466689
]
},
{
"alternatives_count": 0,
"waypoint_index": 10,
"matchings_index": 0,
"name": "",
"location": [
139.621048,
35.466684
]
},
{
"alternatives_count": 0,
"waypoint_index": 11,
"matchings_index": 0,
"name": "",
"location": [
139.621086,
35.466723
]
},
{
"alternatives_count": 0,
"waypoint_index": 12,
"matchings_index": 0,
"name": "",
"location": [
139.621568,
35.466693
]
},
{
"alternatives_count": 0,
"waypoint_index": 13,
"matchings_index": 0,
"name": "",
"location": [
139.620918,
35.466552
]
},
{
"alternatives_count": 0,
"waypoint_index": 14,
"matchings_index": 0,
"name": "",
"location": [
139.621361,
35.466003
]
},
{
"alternatives_count": 1,
"waypoint_index": 15,
"matchings_index": 0,
"name": "",
"location": [
139.620989,
35.466881
]
}
],
"code": "Ok"
}
描画してみると、次のようになります。
あれれ、ただ単にデータが減っただけみたいですね。
もともとは38個あった緯度経度データが、14個に減っています。
なぜなぜ～。
日本はまだまだデータが少ないからなのか、そもそものデータが少ないのか。
謎ぽよです。
ちょっとわかりませんね。