def discovery_dile_by_radius(lon,lat,radius):
"""Discovery the diles given a center point by lon/lat and a radius in km.
:example: /discovery/dile/by/radius/-135.0/22.5/5000.0
:param: dim -- json document
:param: var -- single or multiple string variables' names
:returns: geojson -- the return a feature collection with the selected diles.
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"""
qbm = QueryBuilderMongo()
d_param = request.args.get('dim')
v_param = request.args.getlist('var')
# creating the dimension query
if d_param is not None:
qbm = getDimentions(d_param, qbm)
# creating the variables query
if v_param:
qbm = getVariables(v_param, qbm)
query = qbm.queryIntersectRadius(app.config['LOCATION'], float(lon), float(lat), float(radius))
qbm.addField(query)
qbm.addProjection({"_id": 0, "uri" : 1})
return jsonify(query_diles_db(qbm.getQuery()))
