using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class CoordenadaConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return objectType == typeof(Coordenada);

    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        if (reader.TokenType == JsonToken.Null)

            return null;

        var array = JArray.Load(reader);

        var coordenada = (existingValue as Coordenada ?? new Coordenada());

        coordenada.Latitude = (float)array[0];

        coordenada.Longitude = (float)array[1];

        return coordenada;

    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        var coordenada = (Coordenada)value;

        serializer.Serialize(writer, new[] { coordenada.Latitude, coordenada.Longitude });

    }

}

​

[JsonConverter(typeof(CoordenadaConverter))]

public class Coordenada 

{

    public float Latitude {get; set;}

    public float Longitude {get; set;}

}

​

public class Program

{   

    public static void Main()

    {

        var json = @"

[

    [-23.45317,-46.707126],

    [-23.453181,-46.707125],

    [-23.453196,-46.707123],

    [-23.453484,-46.706913],

    [-23.453593,-46.706865],

    [-23.453759,-46.706795],

    [-23.453942,-46.706744],

    [-23.45431,-46.7066],

    [-23.454667,-46.706528],

    [-23.455409,-46.70635],

    [-23.45572,-46.706264],

    [-23.455805,-46.706178],

    [-23.45586,-46.706151],

    [-23.455983,-46.706157],

    [-23.456166,-46.706137],

    [-23.457182,-46.705768],

    [-23.457373,-46.705762],

    [-23.457346,-46.705728],

    [-23.457339,-46.705664],

    [-23.457388,-46.705554],

    [-23.457451,-46.705489],

    [-23.457565,-46.705387],

    [-23.457713,-46.705283],

    [-23.457778,-46.705215],

    [-23.457809,-46.705126],

    [-23.457822,-46.705061],

    [-23.45783,-46.704993],

    [-23.457832,-46.704927],

    [-23.457819,-46.704846],

    [-23.457761,-46.704654],

    [-23.457719,-46.704532],

    [-23.457543,-46.704264],

    [-23.457378,-46.704054],

    [-23.457296,-46.703964],

    [-23.457257,-46.703931]

]

        ";

        var deserialized = JsonConvert.DeserializeObject<Coordenada[]>(json);       

        foreach (var coordenada in deserialized) 

        {

            Console.WriteLine("Latitude: " + coordenada.Latitude + ", Longitude: " + coordenada.Longitude); 

        }

        var serialized = JsonConvert.SerializeObject(deserialized, Formatting.Indented);        

        Console.WriteLine(serialized);

    }

}