Hi Phanindra,
This is a late answer but I took time to test the solution using the urllib2
module to send a request to a website and extract data. I give you an example
with the Overpass API.
Using Overpass is a very interesting solution to extract for a bbox and pass
the result to Python. It is possible to output in json and then convert easily
to Python dictionary objects. The python script example below uses the urllib2
module to send a request and read the result.
The url contains the instructions sent to the Overpass API. In this example,
The nodes that have a name Tag are extracted for the given bbox.
In the dictionary, elements contains the list of elements extracted from OSM.
The string function .decode('utf8') let's decode and print correctly the UTF8
characters.
Pierre
Python script
---------------------------------------------------------------------------------------------------------------------------------------------------
import urllib2,urllib,json
# space replaced with + sign
url='http://overpass.osm.rambler.ru/cgi/interpreter?data=[out:json];(node[name](45.37301118463942,-72.80742645263672,45.416286468478475,-72.71095275878906););out+body;'
try:
print "try request"
overpass_response = urllib2.urlopen(url)
print "info"
print overpass_response.info()
#overpass_response = urllib2.urlopen(url_o)
except urllib2.HTTPError as e:
# list of error codes at http://docs.python.org/2/howto/urllib2.html
print('The server couldn\'t fulfill the request.')
print('Error code: ', e.code, responses[e.code])
print urllib2.info()
except urllib2.URLError as e:
print('We failed to reach a server.')
print('Reason: ', e.reason)
else:
# everything is fine
#overpass_response = open(overpass_request)
#print "apres open"
overpass_txt=overpass_response.read().decode('utf8')
overpass_response.close()
overpass_json = json.loads(overpass_txt)
print "dictionnary elements - we access and print each element of the list"
elements=overpass_json["elements"]
nb=0
for element in elements:
nb+=1
print "\n",nb,"\t",element
print "\t"+element["type"]+", id="+str(element["id"])+",
lat="+str(element["lat"])+", lon="+str(element["lon"])
if ("name" in element["tags"]):
print "\tname="+element["tags"]["name"]
________________________________
De : Phanindra Kuchipudi <[email protected]>
À : [email protected]
Envoyé le : Lundi 4 novembre 2013 0h26
Objet : [OSM-dev] Downloading OSM data
Hi,
I want to write a python script to download OSM data based on a given bounding
box (implementing XAPI).
Can anyone help me how to develop this script, and also can you give
information on any other scripts available for this downloading functionality?
Thanks,
Phani
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