[mkgmap-dev] Merge tiles to gmapsupp based on poly files

Thu Jul 14 20:34:43 BST 2022

Hi Daniel,

there should be no problems with routing, because a route should switch 
maps at the country border. See mkgmap option 
--add-boundary-nodes-at-admin-boundaries.

If you don't like tiles without full content, then use bigger extract 
and smaller poly file as an option for splitter. See splitter option 
--polygon-file.

Other possibility is to split bigger extract (for example Europe), 
convert all tiles to img and then create lists of tiles for each country 
you need (for example Germany and France). Then you can run again mkgmap 
with list of img as an input, to create separate maps.

Unfortunately rectangle tiles causes a problem for address search. If 
you are near the border on a tile shared by 2 maps, then GPS could use 
wrong map for a search. Proper solution would be to have irregular tiles 
cut at an administrative border. This is how original Garmin maps are 
split into countries.

-- 
Best regards,
Andrzej