gt; to calculate more accurately the bounding box = the maximum distance at
> which the location should be located to be relevant to the user. A user
> looking for Pizza in New York is expecting to have his results within a
> radius of a maximum of 1 or 2 miles. If he is looking for a Theme
Query classification is an interesting question and there are many papers
discussed this. For more infomation, you could refe these papers, "A
taxonomy of web search", "Understanding user goal in web search", "Our
winning solution to query classification in KDDCUP 2005".
In your question, i think
