public List <Location> findReindeers()
        {
            using (var documentClient = new DocumentClient(API_URI, reindeers.token))
                return(reindeers.zones.Select(zone =>
                {
                    var feedOptions = new FeedOptions()
                    {
                        PartitionKey = new PartitionKey(zone.countryCode),
                        MaxItemCount = 1
                    };

                    var distance = PositionUtil.DistanceInMeters(zone.radius.unit, zone.radius.value);
                    var from = new Point(zone.center.lon, zone.center.lat);
                    // var sql = "SELECT * FROM root r WHERE root.name = '" + zone.reindeer
                    // + "' AND ST_DISTANCE(root.location, {'type': 'Point', 'coordinates':["
                    //      + zone.center.lat + ", " + zone.center.lon + "]}) < " + distance;
                    // System.Console.WriteLine(sql);
                    ReindeerLocation reindeerLocation = documentClient.CreateDocumentQuery <ReindeerLocation>(
                        UriFactory.CreateDocumentCollectionUri(DatabaseId, CollectionId),
                        feedOptions
                        ).Where(a => a.name == zone.reindeer && a.location.Distance(from) <= distance)
                                                        .AsEnumerable()
                                                        .FirstOrDefault();

                    return new Location()
                    {
                        name = reindeerLocation.name,
                        position = new Center()
                        {
                            lat = reindeerLocation.location.Position.Latitude,
                            lon = reindeerLocation.location.Position.Longitude
                        }
                    };
                }).ToList());
        }
 private double CalculateMovementInMeters(SantaMovement santaMovement)
 {
     return(PositionUtil.DistanceInMeters(santaMovement.unit, santaMovement.value));
 }