[mkgmap-dev] MapSource crash with DEM: Maybe tdb file needs changes?From osm@pinns osm at pinns.co.uk on Mon Feb 5 11:16:53 GMT 2018
Hi Gerd Have been checking a few garmin tdbs and it appears that while the first 3 bytes remain the same for each, ie 01 00 00, the last four bytes are always different and never zero ! also ,except with mkgmap tiles, I have not come across C3 in the second byte ie a 01 *c3 *00 Nick On 05/02/2018 08:36, Gerd Petermann wrote: > Hi, > > Ive discussed with Frank if there might be a field in the tdb file that has to be changed. > Maybe there is a value that tells MapSource something about the alignment of DEM data? > > I don't have a single original Garmin tdb file :-( > > It seems that mkgmap writes some constants that might be important, e.g. MapDetailBlock.java contains > //01 c3 00 ff > os.write4(0xff00c301); > os.write(0); > os.write(0); > os.write(0); > > The wiki  describes these 7 bytes as > "byte:0 has copyright text,byte 1: has 0x53 text : byte 2:if 1 then bytes 3_7: an unknown total (density)" > > The display tool seems to expect something similar to the wiki: > d.rawValue(2, "01 01"); > d.byteValue("intro flag"); > d.intValue("intro %d"); > > Any idea what this "intro" or "unknown total(density) could be ? > And what is the 0x53 text? > > https://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/TDB_File_Format > > Gerd > _______________________________________________ > mkgmap-dev mailing list > mkgmap-dev at lists.mkgmap.org.uk > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20180205/7f08f2fc/attachment.html>
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