On Wed, Jun 04, 2008 at 06:03:45PM +0200, Christophe Leske scratched on the wall: > Ok, > > so i got the rtree extension to work. It does load and creates the > tables wanted. > > Now I am studying the ReadMe > (http://www.sqlite.org/cvstrac/fileview?f=sqlite/ext/rtree/README&v=1.4) > and there is this requirement: > > All r-tree virtual tables have an odd number of columns between > 3 and 11. Unlike regular SQLite tables, r-tree tables are strongly > typed. > > The leftmost column is always the pimary key and contains 64-bit > integer values. Each subsequent column contains a 32-bit real > value. For each pair of real values, the first (leftmost) must be > less than or equal to the second. > > Hmm - well, how is one supposed to make longitude and latitude data fit > in there?
The "R" in "R-Tree" is for rectangle. The structure is designed to hold spaces, not points. You want to do something like: ... rtree(id, long-min, long-max, lat-min, lat-max) For cities where you only have point locations, enter each lat and long twice. -j -- Jay A. Kreibich < J A Y @ K R E I B I.C H > "'People who live in bamboo houses should not throw pandas.' Jesus said that." - "The Ninja", www.AskANinja.com, "Special Delivery 10: Pop!Tech 2006" _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
