[mkgmap-dev] max-nodes in splitter

Sat Nov 12 22:34:47 GMT 2016

I am guessing that

> Number of MapFailedExceptions: 0
> Number of ExitExceptions: 0

would be non zero, if I choose to high nodecount in one tile?

Am 12.11.2016 um 10:05 schrieb Gerd Petermann:
> Hi Jakob,
>
>
> Jakob Mühldorfer-2 wrote
>>    * Does the splitter print an error when max-nodes is too large, or is
>>      it unpredictable and will it only fail on the GPS device
> No. There is no specific limit on the number of nodes in the device, the
> value is just an easy to calculate number which expresses the density of
> data. There are size limits in a single IMG file, and mkgmap will print an
> error message (and write an empty img file) in such a case, so one wants to
> avoid that. The actual tile size depends on various parameters, esp. the
> style.
>
>
> Jakob Mühldorfer-2 wrote
>>    * Do tiles with more nodes mean higher or lower draw performance on
>>      devices, or not matter at all
> I have no idea. If you split an area into many small tiles instead of a few
> larger ones, you will more often
> cross the border of a tile when driving through the area, which probably
> means that the device has to read the whole next tile. On the other hand,
> reading a small tile should be faster.
> Within a single tile the data is again organized in smaller sub areas, so
> the impact on draw performance should be very small.
> I've looked at a few Garmin gmapsupp files and they have tile sizes between
> 2 and 12 MB, so Garmin seems not to care about it very much.
>
> Gerd
>
>
>
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