According to options file, --overview-mapname and --overview-mapnumber
parameters should only have an effect "If --tdbfile is enabled...", but
they seem to be always taken into account regardless of --tdbfile, as
can be checked with command: java -jar mkgmap.jar --gmapsupp
--overview-mapname=test --overview-mapnumber=0000001 test.osm
Additionally, overview files (osmmap.img, osmmap.tdb and ovm_XXX.img)
are created when only --gmapsupp is passed to mkgmap (no --tdb-file), as
in the command below:
java -jar mkgmap.jar --gmapsupp test.osm
I think if you just want to create a gmapsupp file, overview files are
not needed at all and they should not be created.
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