there is an existing library https://launchpad.net/osmxapi
On Fri, Nov 8, 2013 at 7:37 AM, Pierre Béland <pierz...@yahoo.fr> wrote:
> 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 <phani....@gmail.com>
> *À :* dev@openstreetmap.org
> *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
>
> _______________________________________________
> dev mailing list
> dev@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/dev
>
>
>
> _______________________________________________
> dev mailing list
> dev@openstreetmap.org
> https://lists.openstreetmap.org/listinfo/dev
>
>
_______________________________________________
dev mailing list
dev@openstreetmap.org
https://lists.openstreetmap.org/listinfo/dev
