Excellent progress! I mentioned before I don't get much of this hexa engineering. But I have several mdr files for anyone to look into. I anyone interested? Where do I dump them? On Tue, Sep 22, 2009 at 4:52 PM, Steve Hosgood <steve@tallyho.bc.nu> wrote:
Felix Hartmann wrote:
Steve Ratcliffe wrote:
On 21/09/09 17:03, Steve Hosgood wrote:
MDR 1: A reverse index from maps to the other sections. MDR 4: poi types, partially known MDR 5: Cities MDR 6: unknown, wiki claims it is a list of cities but I don't believe that
I wrote that bit of the wiki, and for me at least it's true. This is deduced from an NT map, with a record-length of 3 bytes. I wrote a
Yea, the big problem is that there is not just one format, I've no idea about NT, but there are multiple different header sizes and record sizes possible. Also there is a big difference between the full format as it comes with a map for mapsource, and the format when it transformed and put inside the gmapsupp.
I didn't know that, but it's all in need of documentation eventually. You're right though Steve - the wiki needs the sections talking about individual MDRs to specify more clearly what the record-size is, and maybe the other 4-byte value from the header too - the one tentatively marked "flags" or "?".
Why do you try to go for NT format?
Because that's all I've got. At the time I started, I didn't realise there was anything unusual about the map I have (it's the one that came with my Streetpilot).
As for NT maps being slower - well it seems that they're using compression on the postcode, street-name and city lists. I can imagine that there's a speed penalty.
Steve.
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