On Tue, Sep 16, 2008 at 01:22:39PM -0400, Matthias Julius wrote: > 1. <header> <offset to index> <meta data> <index> <tile data> > 2. <header> <index> <meta data> <tile data> > 3. <header> <index> <tile data> <meta data> > > I prefer the last one. It remains compatible with the current format > (I know, I'm repeating myself.), writing of meta data is simple (just > write at the end of the file) and reading is simple, too (just read from > last offset to EOF).
3 looks fine to me too. > In which form should we store meta data? Someone suggested XML, but I > would like to avoid that. The simplest form is probably the internet > header format (RFC 822) limited to single lines. 1) either fixed defined length per field (easiest to parse, most bloaty), e.g. 100 bytes renderer, 8 bytes x,y etc... 2) 1 line per item RFC822 sounds ok... Again, let's be very careful about what we want here. Everything multiplies with 16mio bytes times the number of layers we have. _______________________________________________ Tilesathome mailing list [email protected] http://lists.openstreetmap.org/listinfo/tilesathome
