def convert_GPS_lat_long(df):
    for (index, row) in df.iterrows():
        lat_viejo = row['GPS_lat']
        latVal = ((40008000 * row['GPS_lat']) / 360)
        df.loc[(index, 'GPS_lat')] = latVal
        lat_radians = math.radians(lat_viejo)
        lonVal = ((40075160 * row['GPS_lon']) / 360)
        lonVal = (lonVal * math.cos(lat_radians))
        df.loc[(index, 'GPS_lon')] = lonVal
def convert_GPS_lat_long(df):
    for (index, row) in df.iterrows():
        lat_viejo = row['GPS_lat']
        latVal = ((40008000 * row['GPS_lat']) / 360)
        df.loc[(index, 'GPS_lat')] = latVal
        lat_radians = math.radians(lat_viejo)
        lonVal = ((40075160 * row['GPS_lon']) / 360)
        lonVal = (lonVal * math.cos(lat_radians))
        df.loc[(index, 'GPS_lon')] = lonVal