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[mkgmap-dev] How to create an empty overview map (for transparent maps)

From Felix Hartmann extremecarver at gmail.com on Wed Sep 1 11:18:19 BST 2021

If you create a separate map for buildings or contourlines only - usually
there is no need for an overview map - or better no need for any content in
the overview map - or am I missing something?

Because those maps sometimes may have very large tiles, but very few levels
(maybe only 24) - mkgmap creates an overview map at the next resolution -
and will then often throw warnings such as:

SEVERE (OverviewBuilder): Tile selection (0x4a) polygon for tile 84900000
cannot be written in level 0 resolution 21, using 20 instead

There is still a need for an empty overview map - as without it you cannot
show the map in Basecamp/Mapsource - or transfer it with MapInstall.
I know the overview map is only empty 0x4a polygons - just wondered if
there is a better solution...

is not given.

Felix Hartman - Openmtbmap.org & VeloMap.org
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