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List:       postgis-users
Subject:    [postgis-users] Routing and indexing
From:       Nathaniel <naptrel () yahoo ! co ! uk>
Date:       2006-12-16 13:06:55
Message-ID: 9608A6B4-A470-451F-B2E9-3F42E94A8D5F () yahoo ! co ! uk
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The routing modules pgrouting and pgdijkstra are generating quite a  
bit of discussion on this list. Although it seems a little off topic  
wrt postGIS, the relevance to GIS in general seems quite obvious.

I, too, would like to do some routing sums, but in a heavy loaded,  
multi-user system, the GHz-consuming server-side processing could eat  
away performance very quickly. Can anyone give me any pointers to  
"indexing" systems for routing algorithms---i.e. schemes that pre- 
calculate shortest routes either between all, or perhaps carefully  
selected "important" graph nodes, so that the shortest route does not  
have to be fully (re)calculated for every query?

Nat
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