[GIS] Truck Routing in Google Maps

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I know that Google Maps does not have a truck routing feature , ie, changing the route if a low bridge is detected.

Is there a way I can implement this in Google Maps using a 3rd party API?

If yes, then which APIs are supported and preferable.

Best Answer

Take a look at OpenRouteService.org. This OSM-based routing engine has a heavy vehicle profile, where you can specify dimension limitations (e.g., length, width, height, weight) or load characteristics (e.g., hazardous materials) of a heavy vehicle. The API is described on the wiki.

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You need to typecast each Object on the JSON response to the proper kind.

The web service API also doesn't return the ub property of the DirectionsResult (undocumented property), you need that as well. The DirectionsRenderer expects ub.travelMode, ub.origin and ub.destination (all strings). The origin and destination are only used if you enable the draggable property on the DirectionsRendererOptions - they are basically the same value that you pass on the DirectionsService#route() call.

Assuming you are on a browser that supports the ES5 Array#forEach method:

function typecastRoutes(routes){
    routes.forEach(function(route){
        route.bounds = asBounds(route.bounds);
        // I don't think `overview_path` is used but it exists on the
        // response of DirectionsService.route()
        route.overview_path = asPath(route.overview_polyline);

        route.legs.forEach(function(leg){
            leg.start_location = asLatLng(leg.start_location);
            leg.end_location   = asLatLng(leg.end_location);

            leg.steps.forEach(function(step){
                step.start_location = asLatLng(step.start_location);
                step.end_location   = asLatLng(step.end_location);
                step.path = asPath(step.polyline);
            });

        });
    });
}

function asBounds(boundsObject){
    return new google.maps.LatLngBounds(asLatLng(boundsObject.southwest),
                                    asLatLng(boundsObject.northeast));
}

function asLatLng(latLngObject){
    return new google.maps.LatLng(latLngObject.lat, latLngObject.lng);
}

function asPath(encodedPolyObject){
    return google.maps.geometry.encoding.decodePath( encodedPolyObject.points );
}

So you would use it like this:

var renderer = new google.maps.DirectionsRenderer();

function renderDirections(map, response, request){
    renderer.setOptions({
        directions : {
            routes : typecastRoutes(response.routes),
            // "ub" is important and not returned by web service it's an
            // object containing "origin", "destination" and "travelMode"
            ub : request
        },
        draggable : true,
        map : map
    });
}

PS: make sure you load the Geometry Library otherwise the google.maps.geometry.encoding.decodePath method won't be available.

Best Answer

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