{
    "_id" : 1298,
    "location_hid" : 2,
    "trip_id" : 868,
    "free_record" : "",
    "status" : "A",
    "createdate" : "2015-09-10 11:14:20",
    "loc" : {
        "type" : "LineString",
        "coordinates" : [ 
            [ 
                -73.958, 
                40.8003
            ], 
            [ 
                -73.9498, 
                40.7968
            ], 
            [ 
                -73.9737, 
                40.7648
            ], 
            [ 
                -73.9814, 
                40.7681
            ]
        ]
    }
}


i need the total distance travelled in km 

db.d.find({
    loc: {
        $geoIntersects: {
            $geometry: {
                type: "LineString",
                coordinates: [[ -73.958, 40.8003],[-73.9498,40.7968],[-73.9737,40.7648],[-73.9814,40.7681]]
            }
        }
    }
})