On Thu, Oct 16, 2008 at 03:49:11AM +1200, Joseph Gentle wrote: > On Thu, Oct 16, 2008 at 3:18 AM, Andy Allan <[EMAIL PROTECTED]> wrote: > > 'Better' is dependent on what you're trying to achieve, but there are > > certainly many 'different' representations in use in different > > projects. > > I want to represent the data such that a user can pan and zoom a map > around smoothly (25+ fps) without pre-rendering tile images. > Especially on devices like the iphone, that would be really nice. > > The only data structure I can think of to do something like this would > be a quad tree with internal nodes containing data at particular > detail levels. (So that for a fixed size view you never have to > inspect more than a fixed number of quad tree nodes). > > Basically, it would look the same as the current tile set; but > prerendered tile images would be replaced with node&way lists listing > the data the corresponding tile shows. > > Has anyone written a program like this; either with that sort of data > format or solving that problem?
Have a look at "navit". Although 25+ fps is somewhat optimistic for a mobile device... (http://wiki.openstreetmap.org/index.php/Navit) I use postgis for live rendering of OSM data and generally it is very fast. But OSM has huge amounts of data and you'll have to make compromises somewhere. Jochen -- Jochen Topf [EMAIL PROTECTED] http://www.remote.org/jochen/ +49-721-388298 _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
