I just went through the final 2008 delimitation order from ECI which is available here: http://eci.nic.in/delim/Final_Publications/finalpublication.asp
Parliament constituencies are defined in terms of assembly constituencies. And assembly constituencies are defined in terms of tehsil/sub-tehsil/local bodies. We already have a pretty good district boundary dataset in OSM (although it looks like its from 2001). The next step is to probably update this as start adding subdistricts/tehsils which can make it an extremely rich dataset for a wide variety of uses including deriving a decent constituency map. -- Arun Ganesh (planemad) <http://en.wikipedia.org/wiki/User:Planemad> <http://j.mp/ArunGanesh>
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