[mkgmap-dev] overview2 branch -- sea not rendered at resolution 12

Wed May 8 12:51:13 BST 2013

Hi Felix,

do you see the see in the ovm_*.img files? If yes, the problem is in the
part that reads back these files.

Gerd

Felix Hartmann-2 wrote
> On 08.05.2013 02:15, Gerd Petermann wrote:
>> Hi all,
>>
>> >
>> > Well, I first thought it would be a Mapsource/Basecamp bug, but 
>> actually
>> > mkgmap overview2 is not rendering the sea tiles down to resolution 12.
>> > The lowest resolution working is resolution 14... -- at 13 some sea is
>> > rendered, at 12 no sea at all is rendered. I think unlike in my earlier
>> > reply to Henning - that this is some internal bug (maybe related to 
>> that
>> > before 13 was the resolution of the overview map)
>>
>> I assume the polygons generated by SeaGenerator are too small, means, 
>> they are all filtered
>> in the low resolution levels. Maybe we can implement a merge-polygons 
>> function to solve this
>> problem. Anyway, this is probably not directly related to the overview 
>> stuff.
> that's what I first thought too. But then I looked at a map created with 
> the same settings using the old overview2 branch (before multiple 
> levels) - which was done at resolution 13. And there no sea at all was 
> missing - while now at 13 it is mostly gone. So I guessed that there 
> must be some other problem...
>>
>> >
>> > Else I really think that the branch can be merged. It is really working
>> > well now... - and I played around a lot with it.
>>
>> :-)
>> Please post a diff for the default style (or a zip file containing all 
>> files). I do not fully
>> understand the changes.
>>
>> > Only other thing is maybe to have an option to delete / not delete the
>> > ovm*.img files after creation.
>>
>> Yes, I think an option is ok. I prefer to have the files as it helps 
>> debugging.
>>
>> >
>> > Resolution 12 is great for continent maps like Europe (not fully needed
>> > - 14 could do), or Asia (13 is a must, 12 would be much better).
>>
>> Please place that knowledge as a comment in the style options file.
>> Maybe you can also add something to the doc files?
>>
>> Gerd
>>
>>
>>
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