[mkgmap-dev] How to create a map covering Fiji & Samoa?

Sun Mar 4 14:05:32 GMT 2012

Ooops, should be 
if (lon > maxLon) ...

Gerd

GerdP wrote
> 
> Hi Colin,
> 
> your are right, it's not the IDL, but the 180-degree longitude.
> 
> splitter and mkgmap are internally using integer values to represent the 
> latitude and longitude values.
> Longitude -180 is represented by -8388608, and +180 is reprensented by
> 8388608.
> So, the integer values are very different, but -180 and +180 are - afaik -
> exactly the same.
> A lot of comparison are done with something like 
> if (lat > maxlat)...
> and I think a lot of them will fail.
> 
> Gerd
> 
> 
> 
> Colin Smale-2 wrote
>> 
>> Gerd,
>> 
>> I have no idea how to answer your question, but I was wondering if it is 
>> really connected to the IDL or the 180-degree longitude? Of course 
>> 179.99 East is separated from 179.99 West by only 0.02 degrees, not 
>> 359.98. I can imagine how this would need some special handling. The IDL 
>> wanders around quite a bit, roughly centred on 180. If the issue really 
>> is connected to the IDL, I would love to learn how!
>> 
>> Colin
>> 
>> On 04/03/2012 11:09, GerdP wrote:
>>> Hi,
>>>
>>> while optimizing splitter and mkgmap I did never see special code to
>>> handle bounding boxes that cover the date limit.
>>> I wonder if I have to test that case?
>>>
>>> In other words: What are the steps to create
>>> a map covering e.g. Fiji and Samoa?
>>> Are features like routing expected to work?
>>>
>>> Gerd
>>>
>>>
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> 

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