I want to use SQLite in a GIS application where I create a database >containing terrain data (coordinates, height). >I would like to query this database with start and end points of a >line and >get a vector with all heights point along this line. >I can, of course create a query for each point along the line, but >this will >be very time consuming as I have hundreds of lines with hundreds of >points. >Any suggestions?
Google for "Voronoï diagrams" and "Delaunay triangularization". These are the very basic tools for modelling terrain at small scales (with small details). From then, if you need profile approximation, then you can use one of the many versions of "splines" or "parametric curves" to fit the data. You're certainly better off using a proven dedicated extension for doing so. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
