Centroidcalculate.py

def calculateCentroid(place):
    """ Calculates the centroid from a bounding box."""
    # Obtain the coordinates from the bounding box.
    coordinates = place['bounding_box']['coordinates'][0]
    
    longs = np.unique( [x[0] for x in coordinates] )
    lats  = np.unique( [x[1] for x in coordinates] )
    
    if len(longs) == 1 and len(lats) == 1:
        # return a single coordinate
        return (longs[0], lats[0])
    elif len(longs) == 2 and len(lats) == 2:
        # If we have two longs and lats, we have a box.
        central_long = np.sum(longs) / 2
        central_lat  = np.sum(lats) / 2
    else:
        raise ValueError("Non-rectangular polygon not supported.")

    return (central_long, central_lat)

# Calculate the centroids of place     
centroids = tweets_sotu['place'].apply(calculateCentroid)