-
Notifications
You must be signed in to change notification settings - Fork 1
/
get_chmi_objects.py
57 lines (45 loc) · 1.77 KB
/
get_chmi_objects.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
import anyjson
import csv
import urllib2
from lxml.html.soupparser import fromstring
from lxml.cssselect import CSSSelector
STATIONS = {}
def get_station(link):
link = "http://hydro.chmi.cz/isarrow/" + link
try:
tree = fromstring(urllib2.urlopen(link).read().decode('cp1250'))
ident = CSSSelector("table tr:nth-child(1) td")(tree)[1].text
STATIONS[tree.xpath("//table/tr[14]/td")[0].text] = {
'id' : ident,
# 'name' : CSSSelector("table tr:nth-child(1) td")(tree)[0].text,
'x' : tree.xpath("//table/tr[14]/td")[0].text,
'y' : tree.xpath("//table/tr[15]/td")[0].text,
}
except:
print "Failed to retrieve station"
def scrape():
complete_url = "http://hydro.chmi.cz/isarrow/objects.php?ukol_p=1&vod_typ=R&nadmh_sign=%3E&rickm_sign=%3E&rok_od=2009&rok_do=2012&objekty_chemdata=1&matrice=2000868184&typodb=41&seq=364922&ordrstr=NM&agenda=POV&limit_clsf=&matrice_clsf=&tscon_clsf=&rok_od_clsf=&rok_do_clsf=&val_sign_clsf=&val_clsf=&agg_clsf=&startpos=0&recnum=600"
tree = fromstring(urllib2.urlopen(complete_url).read().decode('cp1250'))
links = CSSSelector("table.tbl a")(tree)
i = 1
print str(len(links)) + " links found"
for link in links:
print "Retrieving station " + str(i)
i += 1
get_station(link.get("href"))
def store():
f = open('stations.json', 'w')
f.write(anyjson.serialize(STATIONS))
f.close()
f = open('stations.csv', 'wb')
w = csv.writer(f)
for k in STATIONS:
row = STATIONS[k]
try:
w.writerow([row['id'].encode('utf-8'), row['x'].encode('utf-8'), row['y'].encode('utf-8')])
except:
print "Error while writing row"
f.close()
if __name__ == "__main__":
scrape()
store()