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

From Gerd Petermann gpetermann_muenchen at hotmail.com on Mon Sep 13 10:09:16 BST 2021


yes, I think that message makes no sense in this situation. I am not sure why I decided to log this as an error.
See https://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3679

I've attached a patch to suppress the message if the input file is a ovm_*.img.
I could also simply reduce severity to warning or remove it for good.


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Felix Hartmann <extremecarver at gmail.com>
Gesendet: Mittwoch, 1. September 2021 12:18
An: Development list for mkgmap
Betreff: [mkgmap-dev] How to create an empty overview map (for transparent      maps)

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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