Steve Ratcliffe wrote:
Hi
On 04/09/09 10:16, Steve Hosgood wrote:
"I<hex number>.GMP". Does anyone know how the<hex number> is derived please? I guess that it is a bit-interleave of the latitude and longitude of some reference-point in the tile, but it could be a byte-interleave, or a nybble-interleave, or the interleave is done with the number expressed in decimal or whatever.
I don't think there is any big significance to the names, they can be fairly arbitrary strings.
Ah - not so! The .MDR file (not yet created by mkgmap) stores the names of subtile-files as 32-bit integers and expects the subtile files themselves to have names of the 'printf' format "I%07lX.GMP". See http://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/MDR_Subfile_Format#MDR1... There is a rumour on that wiki page that the subtile files can also be of a 'printf' format something like "%08ld.GMP", but I've not personally see that. Steve