[mkgmap-dev] [mkgmap-svn] Commit r572: MDR16 is some kind of codebook.

Wed Dec 22 14:22:03 GMT 2021

Hi Ticker,

I think those are the two that I didn't post before.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
Gesendet: Mittwoch, 22. Dezember 2021 12:32
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev]       [mkgmap-svn]    Commit  r572:   MDR16   is      some    kind    of      codebook.

Hi Gerd

Can you send me the Mdr16 display of some of the other maps you've been
looking at. I'd like to try and find some meaning for bytes 0..2 and
the prefix before the level 5 data.

Thanks
Ticker

On Wed, 2021-12-22 at 08:43 +0000, Gerd Petermann wrote:
> Hi Ticker,
>
> I also thought that some bytes may tells us the uncompressed size or
> frequencies. I don't see any clear pattern so far...
>
> Some number for the Adria Topo Map: (Mdr 16 length 212)
> Uncompressed size: 1.582.655 (0x18263e) , compressed: 1029077
> (0x0fb3d5)
> Frequencies of the tree nodes:
>
> '' 0x3 freq: 1 (0x1)
> '%' 0x25 freq: 1 (0x1)
> ':' 0x3a freq: 1 (0x1)

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