spaetz <[EMAIL PROTECTED]> writes: > On Sat, Oct 11, 2008 at 08:44:31PM +0200, ??ukasz Jerna?? wrote: >> So the format has unused fields? Quoting >> http://wiki.openstreetmap.org/index.php/Tiles%40home/Tileset_as_one_file_v2: >> "Each index denotes an unsigned 32-bit integer and either contains >> the blankness information of the tile in question (0=unknown, 1=sea, >> 2=land, 3=transparent), or the offset to the spot in the file where >> the PNG data of that tile starts." >> >> Does it mean that only the offset is stored in the tileset file or >> the integer value for empty tiles is somehow magically computed? > > Sorry, I don't get at all what you are aiming at. These are the > possibilities: > > 1) There is a tileset file in place for a z0, z6, or z12 tileset. In > this case all tiles of it have been rendered and if a tile *from this > tileset* is empty it will be denoted by an blankness value of "1,2,3". > If the tileset file exists the emptyness value of all tiles within > that tileset ome from whatever the client told us. > > 2)If there is no tileset file at all (recognizable by the text > oceantiles.dat is used on the details page), then there is no way of > knowing whether it's really a totally empty tileset or just has never > been rendered (although the "has never been rendered" should pretty > much not occur anymore). In this case the oceantiles.dat on the > server is being used to determine the blankness value of the tileset. > > Does this answer your question?
You could add that the server is discarding tilesets on upload that only conatain empty tiles. Matthias _______________________________________________ Tilesathome mailing list [email protected] http://lists.openstreetmap.org/listinfo/tilesathome
