Meta Search

					Tutorial for CS5286 Algorithms and Techiques for Web Searching


Tutorial Introduction to meta search engine

A meta search engine searches the web by forwarding users’
requests to multiple search engines such as AltaVista,
AlltheWeb or Google. Then the results from the individual
search engine are combined into a single result set and
presented to users.

The differences between meta search engines and search
engines:

   (1) meta search engines don’t have a database of web
       pages, thus don’t need to create inverted file index.

   (2) meta search engines provide search services by
       forwarding users’ queries to other search engines and
       merging the results returned by different search
       engines.

The benefit of the meta search engine is to increase the
searching coverage of the WWW.

The difficulties of designing a good meta search engine lies
on following factors:

   (1) The heterogeneities of source search engines, such as
       different ranking algorithms, make it hard to merge
       to a consistent result.



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Tutorial for CS5286 Algorithms and Techiques for Web Searching


   (2) Different search engines have different query
       syntaxes. Meta search engines need to handle all
       these rules to achieve good effect.

There are two types of meta search tools:

   (1) Server Side Tools:

          Just like Google, AltaVista, you submit the query,
          and then it will return the searching result.

          Try one of the first famous meta search engines
          MetaCrawler http://www.metacrawler.com

          Profusion http://www.profusion.com

          Dogpile        http://www.dogpile.com

         Another very interesting meta search engine

         Vivissimo http://vivissimo.com

   (2) Client Side Tools:

          The search tool is downloaded from the WWW, and
          installed on the desktop. We run this user agent to
          get the information.

          Try this one
          Copernic
          http://www.copernic.com/

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