對齊道路

Roads API 會擷取路徑上最多 100 個 GPS 點，並傳回類似的資料集，其中的點會對應到車輛最有可能行駛的道路。您可以選擇要求插補點，產生平滑的路徑，貼合道路幾何圖形。

要求

您必須使用 HTTPS，以以下形式傳送道路對齊要求：

https://roads.googleapis.com/v1/snapToRoads?parameters&key=YOUR_API_KEY

必要參數

  • 路徑

    要對齊的路徑。路徑參數接受經緯度組合清單。緯度和經度值應以半形逗號分隔。座標應以直立線「|」分隔。例如：path=60.170880,24.942795|60.170879,24.942796|60.170877,24.942796。

    注意：如果點與點之間的距離太遠，對齊演算法可能無法順利運作。如果發現奇怪的對齊行為，請嘗試建立點間距較小的路徑。為確保路徑貼合道路的品質，請盡量提供連續點對之間距離在 300 公尺以內的路徑。這也有助於處理因 GPS 訊號中斷或雜訊，導致連續點之間出現的任何孤立長跳躍。

選用參數

  • 內插

    是否要插補路徑，以納入構成完整道路幾何的所有點。如果為 true，系統也會傳回其他內插點，因此產生的路徑會平滑地沿著道路幾何圖形，即使在轉角和隧道中也是如此。內插路徑很可能包含比原始路徑更多的點。預設值為 false。

範例

下列要求會將指定點對齊道路幾何。這組特定資料沿著環形道路移動，設定 interpolate=true 可讓傳回的幾何圖形符合道路的彎曲度。使用 interpolate=false時，路徑仍會貼齊道路，但產生的折線不會那麼平滑。

網址

https://roads.googleapis.com/v1/snapToRoads
  ?interpolate=true
  &path=-35.27801%2C149.12958%7C-35.28032%2C149.12907%7C-35.28099%2C149.12929%7C-35.28144%2C149.12984%7C-35.28194%2C149.13003%7C-35.28282%2C149.12956%7C-35.28302%2C149.12881%7C-35.28473%2C149.12836
  &key=YOUR_API_KEY

cURL

curl -L -X GET 'https://roads.googleapis.com/v1/snapToRoads?path=-35.27801%2C149.12958%7C-35.28032%2C149.12907%7C-35.28099%2C149.12929%7C-35.28144%2C149.12984%7C-35.28194%2C149.13003%7C-35.28282%2C149.12956%7C-35.28302%2C149.12881%7C-35.28473%2C149.12836&interpolate=true&key=YOUR_API_KEY'

回應

對於每個有效要求，Roads API 會以要求網址中指定的格式傳回回應，例如下列 JSON 回應。

{
  "snappedPoints":
    [
      {
        "location":
          { "latitude": -35.27800489993019, "longitude": 149.129531998742 },
        "originalIndex": 0,
        "placeId": "ChIJr_xl0GdNFmsRsUtUbW7qABM",
      },
      {
        "location":
          { "latitude": -35.2784195, "longitude": 149.12946589999999 },
        "placeId": "ChIJr_xl0GdNFmsRsUtUbW7qABM",
      },
      {
        "location":
          { "latitude": -35.2784195, "longitude": 149.12946589999999 },
        "placeId": "ChIJ6aXGemhNFmsRZE_zHqhmrG4",
      },
      {
        "location":
          { "latitude": -35.2792731, "longitude": 149.12933809999998 },
        "placeId": "ChIJ6aXGemhNFmsRZE_zHqhmrG4",
      },
      {
        "location":
          { "latitude": -35.2792731, "longitude": 149.12933809999998 },
        "placeId": "ChIJTcTdZ2hNFmsRXokM4mWCWfk",
      },
      {
        "location": { "latitude": -35.279557, "longitude": 149.1292973 },
        "placeId": "ChIJTcTdZ2hNFmsRXokM4mWCWfk",
      },
      {
        "location": { "latitude": -35.279557, "longitude": 149.1292973 },
        "placeId": "ChIJiUfNQmhNFmsRSsAI-1m6y1g",
      },
      {
        "location":
          { "latitude": -35.279610999999996, "longitude": 149.1292889 },
        "placeId": "ChIJiUfNQmhNFmsRSsAI-1m6y1g",
      },
      {
        "location": { "latitude": -35.2796484, "longitude": 149.1292791 },
        "placeId": "ChIJiUfNQmhNFmsRSsAI-1m6y1g",
      },
      {
        "location": { "latitude": -35.2796484, "longitude": 149.1292791 },
        "placeId": "ChIJ_RyFQ2hNFmsRoHJAbW7qABM",
      },
      {
        "location":
          { "latitude": -35.279947299999996, "longitude": 149.1291894 },
        "placeId": "ChIJ_RyFQ2hNFmsRoHJAbW7qABM",
      },
      {
        "location":
          { "latitude": -35.279947299999996, "longitude": 149.1291894 },
        "placeId": "ChIJOyypT2hNFmsRZBtscGL0htw",
      },
      {
        "location":
          { "latitude": -35.280323564795005, "longitude": 149.1290903128365 },
        "originalIndex": 1,
        "placeId": "ChIJOyypT2hNFmsRZBtscGL0htw",
      },
      {
        "location":
          { "latitude": -35.2803426, "longitude": 149.12908529999999 },
        "placeId": "ChIJOyypT2hNFmsRZBtscGL0htw",
      },
      {
        "location":
          { "latitude": -35.2803426, "longitude": 149.12908529999999 },
        "placeId": "ChIJr8xRTGhNFmsRzMb-rxgjspc",
      },
      {
        "location":
          { "latitude": -35.280409899999995, "longitude": 149.1290699 },
        "placeId": "ChIJr8xRTGhNFmsRzMb-rxgjspc",
      },
      {
        "location": { "latitude": -35.28048179999999, "longitude": 149.129062 },
        "placeId": "ChIJr8xRTGhNFmsRzMb-rxgjspc",
      },
      {
        "location": { "latitude": -35.2805541, "longitude": 149.1290623 },
        "placeId": "ChIJr8xRTGhNFmsRzMb-rxgjspc",
      },
      {
        "location": { "latitude": -35.280626, "longitude": 149.1290712 },
        "placeId": "ChIJr8xRTGhNFmsRzMb-rxgjspc",
      },
      {
        "location": { "latitude": -35.280626, "longitude": 149.1290712 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location":
          { "latitude": -35.280695099999996, "longitude": 149.12908489999998 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location": { "latitude": -35.2807629, "longitude": 149.1291046 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location": { "latitude": -35.2808294, "longitude": 149.1291306 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location": { "latitude": -35.2809064, "longitude": 149.1291693 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location":
          { "latitude": -35.280968200000004, "longitude": 149.129208 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location":
          { "latitude": -35.28101395754623, "longitude": 149.1292430025548 },
        "originalIndex": 2,
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location":
          { "latitude": -35.28103840000001, "longitude": 149.1292617 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location": { "latitude": -35.2810936, "longitude": 149.1293121 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location": { "latitude": -35.2810979, "longitude": 149.1293176 },
        "placeId": "ChIJv5r0smlNFmsR5nunau79Fv4",
      },
      {
        "location": { "latitude": -35.2810979, "longitude": 149.1293176 },
        "placeId": "ChIJpYMSrmlNFmsRXkCoIkZxgBg",
      },
      {
        "location":
          { "latitude": -35.281152399999996, "longitude": 149.1294256 },
        "placeId": "ChIJpYMSrmlNFmsRXkCoIkZxgBg",
      },
      {
        "location":
          { "latitude": -35.281152399999996, "longitude": 149.1294256 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2811784, "longitude": 149.1294706 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2812258, "longitude": 149.1295413 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.2812771, "longitude": 149.12960759999999 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.281332, "longitude": 149.1296695 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.2813904, "longitude": 149.12972670000002 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.281451700000005, "longitude": 149.1297788 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.28146506991143, "longitude": 149.12978858234607 },
        "originalIndex": 3,
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.28151580000001, "longitude": 149.1298257 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.28158259999999, "longitude": 149.129867 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.281666099999995, "longitude": 149.1299091 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2817377, "longitude": 149.1299379 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.281810899999996, "longitude": 149.1299602 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.281884999999996, "longitude": 149.1299765 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.28194399606459, "longitude": 149.1299842294294 },
        "originalIndex": 4,
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.281959799999996, "longitude": 149.12998629999998 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.282035199999996, "longitude": 149.1299895 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2821254, "longitude": 149.1299851 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location":
          { "latitude": -35.282199999999996, "longitude": 149.1299743 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2822739, "longitude": 149.1299573 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2823468, "longitude": 149.129934 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2824178, "longitude": 149.1299043 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2824379, "longitude": 149.1298945 },
        "placeId": "ChIJ601MoWlNFmsR5mvkfPp2ovA",
      },
      {
        "location": { "latitude": -35.2824379, "longitude": 149.1298945 },
        "placeId": "ChIJe9LPnWlNFmsR7mJw8mYHwG0",
      },
      {
        "location":
          { "latitude": -35.282472999999996, "longitude": 149.1298835 },
        "placeId": "ChIJe9LPnWlNFmsR7mJw8mYHwG0",
      },
      {
        "location": { "latitude": -35.2825375, "longitude": 149.1298525 },
        "placeId": "ChIJe9LPnWlNFmsR7mJw8mYHwG0",
      },
      {
        "location":
          { "latitude": -35.28257309999999, "longitude": 149.1298319 },
        "placeId": "ChIJe9LPnWlNFmsR7mJw8mYHwG0",
      },
      {
        "location":
          { "latitude": -35.28257309999999, "longitude": 149.1298319 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location":
          { "latitude": -35.282665400000006, "longitude": 149.12974459999998 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location":
          { "latitude": -35.28274030000001, "longitude": 149.1296645 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location":
          { "latitude": -35.282809799999995, "longitude": 149.12957799999998 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location":
          { "latitude": -35.28282136229385, "longitude": 149.12956142620385 },
        "originalIndex": 5,
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location": { "latitude": -35.2828744, "longitude": 149.1294854 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location":
          { "latitude": -35.282922299999996, "longitude": 149.1294044 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location":
          { "latitude": -35.282931500000004, "longitude": 149.1293876 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location": { "latitude": -35.2830263, "longitude": 149.1291788 },
        "placeId": "ChIJaUpThGlNFmsRMHWxoH7EOsc",
      },
      {
        "location": { "latitude": -35.2830263, "longitude": 149.1291788 },
        "placeId": "ChIJyd3JiWlNFmsR9RUq2ySTTZQ",
      },
      {
        "location": { "latitude": -35.283054, "longitude": 149.1290996 },
        "placeId": "ChIJyd3JiWlNFmsR9RUq2ySTTZQ",
      },
      {
        "location": { "latitude": -35.2830794, "longitude": 149.1290094 },
        "placeId": "ChIJyd3JiWlNFmsR9RUq2ySTTZQ",
      },
      {
        "location": { "latitude": -35.2830794, "longitude": 149.1290094 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.28313383700836, "longitude": 149.12893500604946 },
        "originalIndex": 6,
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.283134499999996, "longitude": 149.12893409999998 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.283190399999995, "longitude": 149.1288668 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location": { "latitude": -35.2832503, "longitude": 149.1288041 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location": { "latitude": -35.2833133, "longitude": 149.1287463 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location": { "latitude": -35.2833794, "longitude": 149.128694 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.283448299999996, "longitude": 149.128647 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location": { "latitude": -35.2835199, "longitude": 149.1286054 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location": { "latitude": -35.2835934, "longitude": 149.1285699 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.283668899999995, "longitude": 149.12854059999998 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.28372649999999, "longitude": 149.1285237 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.28386179999999, "longitude": 149.12849319999998 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location": { "latitude": -35.2839978, "longitude": 149.1284682 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.2840205, "longitude": 149.12846779999998 },
        "placeId": "ChIJWSb8ImpNFmsRp_4JAxJFE1A",
      },
      {
        "location":
          { "latitude": -35.2840205, "longitude": 149.12846779999998 },
        "placeId": "ChIJZe8tFWpNFmsR4brZ1vldk2E",
      },
      {
        "location":
          { "latitude": -35.2840524, "longitude": 149.12845969999998 },
        "placeId": "ChIJZe8tFWpNFmsR4brZ1vldk2E",
      },
      {
        "location":
          { "latitude": -35.284341500000004, "longitude": 149.1284124 },
        "placeId": "ChIJZe8tFWpNFmsR4brZ1vldk2E",
      },
      {
        "location": { "latitude": -35.2843875, "longitude": 149.1284034 },
        "placeId": "ChIJZe8tFWpNFmsR4brZ1vldk2E",
      },
      {
        "location": { "latitude": -35.2843875, "longitude": 149.1284034 },
        "placeId": "ChIJVx7Ta2pNFmsRx9OI9CnN5tI",
      },
      {
        "location": { "latitude": -35.2845916, "longitude": 149.1283726 },
        "placeId": "ChIJVx7Ta2pNFmsRx9OI9CnN5tI",
      },
      {
        "location": { "latitude": -35.2845916, "longitude": 149.1283726 },
        "placeId": "ChIJtWxAZmpNFmsRlbUCkc6VtnA",
      },
      {
        "location":
          { "latitude": -35.28459730000001, "longitude": 149.1283703 },
        "placeId": "ChIJtWxAZmpNFmsRlbUCkc6VtnA",
      },
      {
        "location":
          { "latitude": -35.284728747199374, "longitude": 149.12834860726772 },
        "originalIndex": 7,
        "placeId": "ChIJtWxAZmpNFmsRlbUCkc6VtnA",
      },
    ],
}

回應會採用下列結構定義。

SnapToRoadsResponse

欄位 必填 類型 說明
選填 陣列<SnappedPoint>

對齊的點陣列。

詳情請參閱 SnappedPoint。

選填 字串

包含使用者可見警告的字串。

SnappedPoint

欄位 必填 類型 說明
required LatitudeLongitudeLiteral 詳情請參閱 LatitudeLongitudeLiteral。
required 字串

地點的專屬 ID。Roads API 傳回的所有地點 ID 都對應至路段。
選填 數字

整數，表示原始要求中的對應值。要求中的每個值都應對應至回應中的對齊值。不過，如果您已將 interpolate 設為 true，或是使用最鄰近的道路，則回應可能包含比要求更多的座標。內插值不會有 originalIndex。這些值會從 0 開始建立索引，因此 originalIndex 為 4 的點，會是傳遞至路徑參數的第 5 個經緯度值。「最近的道路」點可能包含單一座標的多個點，但位置或 placeId 不同。

LatitudeLongitudeLiteral

這個物件會以十進制度數描述特定位置的經緯度。

欄位 必填 類型 說明
required 數字

以十進制度數表示的緯度
required 數字

經度 (十進制度數)