[mkgmap-dev] polygon splitting/more than 255 polygons errors

Fri Sep 2 16:32:27 BST 2011

> Hi Richard,
>
>> Hi,
>>
>> I have recently downloaded some mkgmap generated maps that produce this error when displayed
>> in navit:
>> :garmin_obj.c:1279:1|:Error more than 255 polygons/lines in a subdiv are not supported
>
> This does not look like an mkgmap problem to me. Reading the error
> message I assume that navit does not support subdivisions containing
> more than 255 polygons + lines. But as far as I know there is no such a
> limit for garmin devices.

I have taken a look into the source code.
There is a limit for 255 lines with garmin id < 0x010000 per subdivision 
but no single limit for polygons. Lines, points and shapes with garmin 
id > 0x010000 have their own limits based on the size they need.

But I wonder why there is no single limit for polygons. Only the overall 
size of points+lines+polygons is limited to 65528 bytes. Maybe this is 
wrong?

>
>>
>> It seems there were some patches for this around, did they get integrated? Do they
>> require some special option?
>
> There is at least one known bug regarding the creation of subdivisions.
> I am working on it and will post the patch when it is ready to commit.
>
> There is a first version of the patch (see
> http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2011q2/011818.html) but
> some things are not fixed in it.
>
>>
>> Tried to reporduce the issue it with mkgmap-r2009 and attached test data, I get neither
>> the above error but the object (the Altenburg in Bamberg) isn't displayed either.
>
> Can you please how you created your map?
> 1. Where did you get your data from?
> 2. Did you use splitter and which splitter settings do you use?
> 3. Please send your complete mkgmap parameters.
> Otherwise it is not easy to reproduce the problem.
>
> Thanks!
> WanMil
>
>>
>> Richard
>>
>> ---
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>>
>>