[OSM-dev] Downloading OSM data

[amrit karmacharya]

there is an existing library https://launchpad.net/osmxapi


On Fri, Nov 8, 2013 at 7:37 AM, Pierre Béland <pierzenh at 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.800 at gmail.com>
> *À :* dev at 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
>
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