已有很多作者发布了有关下载怀俄明大学探空数据的博客,但使用python的较少。且近期发现网站上中国地区的站点都消失了。发邮件询问了一下,原来是中国提供的数据格式更改成了BURF,他们在一个新的网站上提供这些数据:http://weather.uwyo.edu/upperair/bufrraob.shtml。新的网站上可以看到中国地区的站点。
下面开始正题
siphon是pyhton语言写的一个工具包,可以用来下载预报数据、再分析数据以及怀俄明的探空数据。我们在其基础上修改代码以适配新网站的格式。可以采用两种方式下载:
手动下载,然后手动添加到项目文件夹中
siphon下载地址:https://unidata.github.io/siphon/latest/examples/upperair/Wyoming_Request.html#sphx-glr-examples-upperair-wyoming-request-py
因为siphon包还未更新至新的数据网站,仍然访问的是旧网站,就会下载不到任何数据。所以需要修改其中的部分代码。
create_session(self)
函数修改为以下内容: def create_session(self):
"""Create a new HTTP session with our user-agent set.
Returns
-------
session : requests.Session
The created session
See Also
--------
urlopen, set_session_options
"""
my_headers = [
"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101 Firefox/30.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.75.14 (KHTML, like Gecko) Version/7.0.3 Safari/537.75.14",
"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)",
'Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11',
'Opera/9.25 (Windows NT 5.1; U; en)',
'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)',
'Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.5 (like Gecko) (Kubuntu)',
'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.12) Gecko/20070731 Ubuntu/dapper-security Firefox/1.5.0.12',
'Lynx/2.8.5rel.1 libwww-FM/2.14 SSL-MM/1.4.1 GNUTLS/1.2.9',
"Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.7 (KHTML, like Gecko) Ubuntu/11.04 Chromium/16.0.912.77 Chrome/16.0.912.77 Safari/535.7",
"Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:10.0) Gecko/20100101 Firefox/10.0 "
]
proxy_list = [
'http://121.43.190.89:3128',
'http://221.224.136.211:35101',
'http://103.216.103.25:80',
'http://175.10.223.95:8060',
'http://121.43.190.89:3128',
'http://222.112.240.167:80'
'http://218.75.102.198:8000'
'http://23.254.161.181:80'
]
# print(random.choice(proxy_list))
ret = requests.Session()
ret.headers['User-Agent'] = random.choice(my_headers)
ret.proxies.update({"http:":random.choice(proxy_list)})
# print(ret.headers['User-Agent'])
# print(ret.proxies)
for k, v in self.options.items():
setattr(ret, k, v)
return ret
__init__(self):
,将其中的super语句修改为:super(WyomingUpperAir, self).__init__('http://weather.uwyo.edu/cgi-bin/bufrraob.py')
找到函数_get_data_raw(self, time, site_id)
,将其中的path修改为:
path = ('?src=bufr&datetime={time:%Y-%m-%d}%20{time:%H}:00:00&id={stid}&type=TEXT:LIST').format(time=time, stid=site_id)
#某站点某天数据网址示例 'http://weather.uwyo.edu/cgi-bin/bufrraob.py?src=bufr&datetime=2021-01-01%2012:00:00&id=54511&type=TEXT:LIST'
_get_data(self, time, site_id)
,将其修改为: def _get_data(self, time, site_id):
r"""Download and parse upper air observations from an online archive.
Parameters
----------
time : datetime
The date and time of the desired observation.
site_id : str
The three letter ICAO identifier of the station for which data should be
downloaded.
Returns
-------
:class:`pandas.DataFrame` containing the data
"""
# 天气数据爬虫文本提取
raw_data = self._get_data_raw(time, site_id)
soup = BeautifulSoup(raw_data, 'html.parser')
tabular_data = StringIO(soup.find_all('pre')[0].contents[0])
print(soup.find_all('pre')[0].contents[0])
col_names = ['pressure', 'height', 'temperature', 'dewpoint', 'direction', 'speed']
df = pd.read_fwf(tabular_data, skiprows=5, sep=' ',infer_nrows=1000 , usecols=[0, 1, 2, 3, 6, 7], names=col_names)
print(df)
df['u_wind'], df['v_wind'] = get_wind_components(df['speed'],
np.deg2rad(df['direction']))
# Drop any rows with all NaN values for T, Td, winds
df = df.dropna(subset=('temperature', 'dewpoint', 'direction', 'speed',
'u_wind', 'v_wind'), how='all').reset_index(drop=True)
# Add unit dictionary
df.units = {'pressure': 'hPa',
'height': 'meter',
'temperature': 'degC',
'dewpoint': 'degC',
'direction': 'degrees',
'speed': 'm/s',
'u_wind': 'm/s',
'v_wind': 'm/s',
}
return df
然后通过下面的代码就可以下载俄怀明的探空数据了:
import pandas as pd
import datetime
import time
import os
from metpy.units import units
from siphon.simplewebservice.wyoming import WyomingUpperAir
# 新建文件夹函数,便于分站点存储数据
def mkdir(path):
folder = os.path.exists(path)
if not folder: # 判断是否存在文件夹如果不存在则创建为文件夹
os.makedirs(path) # makedirs 创建文件时如果路径不存在会创建这个路径
else:
pass
# 设置下载时段(这里是UTC时刻)
start = datetime.datetime(2020, 1, 1, 0)
end = datetime.datetime(2020, 1, 1, 0)
datelist = []
while start<=end:
datelist.append(start)
start+=datetime.timedelta(hours=12)
datelist_s=[]
# 选择下载站点(以上海宝山站为例)
stationlist = ['57494']
# 可通过外部文件批量导入站点编号
# sta = pd.read_csv("station.csv",encoding = 'gb2312',dtype={"id": str})
# stationlist = sta['id']
nodata=[]
data_missing=[]
# 批量下载
for station in stationlist:
datelist_s=datelist.copy()
for date in datelist_s:
try:
df = WyomingUpperAir.request_data(date, station)
mkdir('D:/RS_data/'+station)
df.to_csv('D:/RS_data/'+station+'/'+station+'_'+date.strftime('%Y%m%d%H')+'.csv',index=False)
print(station+date.strftime('%Y%m%d_%H')+'下载成功')
except Exception as e:
print('错误类型是',e.__class__.__name__)
print('错误明细是',e)
print(station+date.strftime('%Y%m%d_%H')+'下载失败,原因如下:')
if e.__class__.__name__=="IndexError":
#加入无数据队列
print(
'No data available for {time:%Y-%m-%d %HZ} '
'for station {stid}.'.format(time=date, stid=station))
nodata.append(station+'_'+date.strftime('%Y%m%d%H'))
elif e.__class__.__name__=="TypeError":
print('Error data type in web page')
nodata.append(station + '_' + date.strftime('%Y%m%d%H'))
elif e.__class__.__name__=="KeyError":
print('Missing data in web page')
data_missing.append(station + '_' + date.strftime('%Y%m%d%H'))
# 其他需要忽略下载的错误可以继续往下加
else:
#把下载失败日期加入到下载队列末端重新下载
datelist_s.append((date))
# 将无数据的站点及日期写入文件
print("无数据提供的站点及日期:")
print(nodata)
f = open("nodata_12.txt", "w")
for line in nodata:
f.write(line + '\n')
f.close()
# 将数据列缺失的站点及日期写入文件
print("数据列存在缺失的站点和日期:")
print(data_missing)
f = open("data_missing_12.txt", "w")
for line in data_missing:
f.write(line + '\n')
f.close()