[mkgmap-dev] resolution, level & levels

Fri Sep 14 00:46:30 BST 2012

John Aldridge <jpsa at jjdash.demon.co.uk> writes:

> Thank you again. I think the fundamental thing I hadn't grasped was that 
> you can't just put a resolution tag on something to cause it to be 
> displayed at that resolution or greater, but that you have to in some 
> sense "create" the level first with the levels specification before you 
> can assign something to that level using either the resolution or level 
> tag.

Yes.  I think what's going on is that in the actual bits, there is (more
or less) a 3-bit field that specifies the level index, and then a table
of 6 levels, so you can't really encode arbitrary levels.  I'm not 100%
clear on that, but I think the above gives you a useful mental model.

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