The Roads API takes up to 100 GPS points collected along a route, and returns a similar set of data, with the points snapped to the most likely roads the vehicle was traveling along. Optionally, you can request that the points be interpolated, resulting in a path that smoothly follows the geometry of the road.
Requests
You must send requests to snap to road using HTTPS in the following form:
https://roads.googleapis.com/v1/snapToRoads? parameters &key= YOUR_API_KEY
Required parameters
-
path
The path to be snapped. The path parameter accepts a list of latitude/longitude pairs. Latitude and longitude values should be separated by commas. Coordinates should be separated by the pipe character: "|". For example:
path=60.170880,24.942795|60.170879,24.942796|60.170877,24.942796.Note: The snapping algorithm works best for points that are not too far apart. If you observe odd snapping behavior, try creating paths that have points closer together. To ensure the best snap-to-road quality, you should aim to provide paths on which consecutive pairs of points are within 300m of each other. This will also help in handling any isolated, long jumps between consecutive points caused by GPS signal loss, or noise.
Optional parameters
-
interpolate
Whether to interpolate a path to include all points forming the full road-geometry. When true, additional interpolated points will also be returned, resulting in a path that smoothly follows the geometry of the road, even around corners and through tunnels. Interpolated paths will most likely contain more points than the original path. Defaults to
false.
Examples
The following request snaps the specified points to the road geometry. This
particular set of data follows a circular road; setting interpolate=true
makes the returned geometry match the curvature of the road. With interpolate=false
, the snapped path still follows the road, but the
resulting polyline isn't as smooth.
URL
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'
Responses
For each valid request, the Roads API returns a response in the format indicated within the request URL such as the following JSON response.
{ "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" , }, ], }
The response uses the following schema.
SnapToRoadsResponse
| Field | Required | Type | Description |
|---|---|---|---|
|
optional | Array< SnappedPoint > | An array of snapped points. See SnappedPoint for more information. |
|
optional | string | A string containing a user-visible warning. |
SnappedPoint
| Field | Required | Type | Description |
|---|---|---|---|
|
required | LatitudeLongitudeLiteral | See LatitudeLongitudeLiteral for more information. |
|
required | string | A unique identifier for a place. All place IDs returned by the Roads API correspond to road segments. |
|
optional | number | An integer that indicates the corresponding value in the original
request. Each value in the request should map to a snapped value in
the response. However, if you've set interpolate=true or if you're
using nearest roads, then it's possible that the response will
contain more coordinates than the request. Interpolated values will
not have an |
LatitudeLongitudeLiteral
An object describing a specific location with Latitude and Longitude in decimal degrees.
| Field | Required | Type | Description |
|---|---|---|---|
|
required | number | Latitude in decimal degrees |
|
required | number | Longitude in decimal degrees |
Demo
- Click around on the map to create a vehicle track. Note that if your points are too far apart, they may not snap correctly.
- Double-click to snap your track to the road.
View this example full screen .
JavaScript
var apiKey = 'YOUR_API_KEY_HERE' ; var map ; var drawingManager ; var placeIdArray = []; var polylines = []; var snappedCoordinates = []; function initialize () { var mapOptions = { zoom : 17 , center : { lat : - 33.8667 , lng : 151.1955 ,} }; map = new google . maps . Map ( document . getElementById ( 'map' ), mapOptions ); // Adds a Places search box. Searching for a place will center the map on that // location. map . controls [ google . maps . ControlPosition . RIGHT_TOP ]. push ( document . getElementById ( 'bar' )); var autocomplete = new google . maps . places . Autocomplete ( document . getElementById ( 'autoc' )); autocomplete . bindTo ( 'bounds' , map ); autocomplete . addListener ( 'place_changed' , function () { var place = autocomplete . getPlace (); if ( place . geometry . viewport ) { map . fitBounds ( place . geometry . viewport ); } else { map . setCenter ( place . geometry . location ); map . setZoom ( 17 ); } }); // Enables the polyline drawing control. Click on the map to start drawing a // polyline. Each click will add a new vertice. Double-click to stop drawing. drawingManager = new google . maps . drawing . DrawingManager ({ drawingMode : google . maps . drawing . OverlayType . POLYLINE , drawingControl : true , drawingControlOptions : { position : google . maps . ControlPosition . TOP_CENTER , drawingModes : [ google . maps . drawing . OverlayType . POLYLINE ] }, polylineOptions : { strokeColor : '#696969' , strokeWeight : 2 , strokeOpacity : 0.3 , } }); drawingManager . setMap ( map ); // Snap-to-road when the polyline is completed. drawingManager . addListener ( 'polylinecomplete' , function ( poly ) { var path = poly . getPath (); polylines . push ( poly ); placeIdArray = []; runSnapToRoad ( path ); }); // Clear button. Click to remove all polylines. document . getElementById ( 'clear' ). addEventListener ( 'click' , function ( event ) { event . preventDefault (); for ( var i = 0 ; i < polylines . length ; ++ i ) { polylines [ i ]. setMap ( null ); } polylines = []; return false ; }); } // Snap a user-created polyline to roads and draw the snapped path function runSnapToRoad ( path ) { var pathValues = []; for ( var i = 0 ; i < path . getLength (); i ++ ) { pathValues . push ( path . getAt ( i ). toUrlValue ()); } $ . get ( 'https://roads.googleapis.com/v1/snapToRoads' , { interpolate : true , key : apiKey , path : pathValues . join ( '|' ) }, function ( data ) { processSnapToRoadResponse ( data ); drawSnappedPolyline (); }); } // Store snapped polyline returned by the snap-to-road service. function processSnapToRoadResponse ( data ) { snappedCoordinates = []; placeIdArray = []; for ( var i = 0 ; i < data . snappedPoints . length ; i ++ ) { var latlng = new google . maps . LatLng ( data . snappedPoints [ i ]. location . latitude , data . snappedPoints [ i ]. location . longitude ); snappedCoordinates . push ( latlng ); placeIdArray . push ( data . snappedPoints [ i ]. placeId ); } } // Draws the snapped polyline (after processing snap-to-road response). function drawSnappedPolyline () { var snappedPolyline = new google . maps . Polyline ({ path : snappedCoordinates , strokeColor : '#add8e6' , strokeWeight : 4 , strokeOpacity : 0.9 , }); snappedPolyline . setMap ( map ); polylines . push ( snappedPolyline ); } $ ( window ). load ( initialize );
JavaScript + HTML
< ! DOCTYPE html > < html > < head > < meta name = "viewport" content = "initial-scale=1.0, user-scalable=no" > < meta charset = "utf-8" > < title>Roads API Demo < / title > < style > html , body , #map { height : 100 % ; margin : 0 px ; padding : 0 px } #panel { position : absolute ; top : 5 px ; left : 50 % ; margin - left : - 180 px ; z - index : 5 ; background - color : #fff ; padding : 5 px ; border : 1 px solid # 999 ; } #bar { width : 240 px ; background - color : rgba ( 255 , 255 , 255 , 0.75 ); margin : 8 px ; padding : 4 px ; border - radius : 4 px ; } #autoc { width : 100 % ; box - sizing : border - box ; } < / style > < script src = "https://www.gstatic.com/external_hosted/jquery2.min.js" >< / script > < script src = "https://maps.googleapis.com/maps/api/js?libraries=drawing,places&key=YOUR_API_KEY" >< / script > < script > var apiKey = 'YOUR_API_KEY_HERE' ; var map ; var drawingManager ; var placeIdArray = []; var polylines = []; var snappedCoordinates = []; function initialize () { var mapOptions = { zoom : 17 , center : { lat : - 33.8667 , lng : 151.1955 ,} }; map = new google . maps . Map ( document . getElementById ( 'map' ), mapOptions ); // Adds a Places search box. Searching for a place will center the map on that // location. map . controls [ google . maps . ControlPosition . RIGHT_TOP ]. push ( document . getElementById ( 'bar' )); var autocomplete = new google . maps . places . Autocomplete ( document . getElementById ( 'autoc' )); autocomplete . bindTo ( 'bounds' , map ); autocomplete . addListener ( 'place_changed' , function () { var place = autocomplete . getPlace (); if ( place . geometry . viewport ) { map . fitBounds ( place . geometry . viewport ); } else { map . setCenter ( place . geometry . location ); map . setZoom ( 17 ); } }); // Enables the polyline drawing control. Click on the map to start drawing a // polyline. Each click will add a new vertice. Double-click to stop drawing. drawingManager = new google . maps . drawing . DrawingManager ({ drawingMode : google . maps . drawing . OverlayType . POLYLINE , drawingControl : true , drawingControlOptions : { position : google . maps . ControlPosition . TOP_CENTER , drawingModes : [ google . maps . drawing . OverlayType . POLYLINE ] }, polylineOptions : { strokeColor : '#696969' , strokeWeight : 2 , strokeOpacity : 0.3 , } }); drawingManager . setMap ( map ); // Snap-to-road when the polyline is completed. drawingManager . addListener ( 'polylinecomplete' , function ( poly ) { var path = poly . getPath (); polylines . push ( poly ); placeIdArray = []; runSnapToRoad ( path ); }); // Clear button. Click to remove all polylines. document . getElementById ( 'clear' ). addEventListener ( 'click' , function ( event ) { event . preventDefault (); for ( var i = 0 ; i < polylines . length ; ++ i ) { polylines [ i ]. setMap ( null ); } polylines = []; return false ; }); } // Snap a user-created polyline to roads and draw the snapped path function runSnapToRoad ( path ) { var pathValues = []; for ( var i = 0 ; i < path . getLength (); i ++ ) { pathValues . push ( path . getAt ( i ). toUrlValue ()); } $ . get ( 'https://roads.googleapis.com/v1/snapToRoads' , { interpolate : true , key : apiKey , path : pathValues . join ( '|' ) }, function ( data ) { processSnapToRoadResponse ( data ); drawSnappedPolyline (); }); } // Store snapped polyline returned by the snap-to-road service. function processSnapToRoadResponse ( data ) { snappedCoordinates = []; placeIdArray = []; for ( var i = 0 ; i < data . snappedPoints . length ; i ++ ) { var latlng = new google . maps . LatLng ( data . snappedPoints [ i ]. location . latitude , data . snappedPoints [ i ]. location . longitude ); snappedCoordinates . push ( latlng ); placeIdArray . push ( data . snappedPoints [ i ]. placeId ); } } // Draws the snapped polyline (after processing snap-to-road response). function drawSnappedPolyline () { var snappedPolyline = new google . maps . Polyline ({ path : snappedCoordinates , strokeColor : '#add8e6' , strokeWeight : 4 , strokeOpacity : 0.9 , }); snappedPolyline . setMap ( map ); polylines . push ( snappedPolyline ); } $ ( window ). load ( initialize ); < /script > < /head > < body > < div id = "map" >< / div > < div id = "bar" > < p class = "auto" >< input type = "text" id = "autoc" /></p> < p><a id = "clear" href = "#" > Click here < / a > to clear map . < / p > < / div > < / body > < /html >
