[mkgmap-dev] address search problem due to required "State" value

Mon Sep 21 19:12:12 BST 2009

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.
>   
Why do you try to go for NT format?
Address search worked very well with non NT maps too. cpgsmapper also 
makes classic non NT maps.

The only advantage of the NT format is that is smaller from what I 
notice on using it. On the other hand NT maps are much much slower.

It is probably easier to start looking at non NT maps with address 
search. At least non NT maps are not needed to be transformed when sent 
to GPS.
> In fact I've just looked at the on device version of MDR 6 and the
> records are three bytes and there does appear to be a map index as the
> first byte, which is entirely different from the mapsource version.
>
> Its all useful, but you need to be clear on what exactly you are
> documenting.  I'm planning to do the full version first, but if that
> doesn't pan out I may try for the on device version. Clearly we want
> both eventually.
>
>   
>> NT maps (with MDR1 using a record-length of 4 bytes) seems to be listing
>> the GMP subtile files. I hear that there are 8 bytes variants - don't
>> know about them.
>>     
>
> OK 4 byte records in MDR1 is the on device format, so I guess that
> confirms that you are working from a map on a GPS device?
>
>   
>> It sounds like a good idea at least to try generating MDR files though -
>> go for it!
>>     
>
> So far I have a test mdr with a country, region and a city, but no luck
> getting it to work so far though.
>
> ..Steve
>   
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>   
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