[mkgmap-dev] Overview map for Africa

Tue Mar 26 12:02:07 GMT 2013

well the original branch, just copied the content from the lowest 
resolution from the .img file, into the overview map.
However that principle is flawed. Content should be either in the 
overview map, or in the .img map. Not in both.

So depending on which levels/resolutions are in your 5MB africa overview 
map (I don't know), 5MB is a good size, or a far too big size...
On 26.03.2013 12:47, GerdP wrote:
> Hi Felix,
>
> I don't understand what problem you see with "all that low resolutions":
> I created the overview map with those tiles that were produced with the
> default
> style.
>
> Gerd
>
>
> Felix Hartmann-2 wrote
>> BTW: here is the old thread about the overview map branch:
>> http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2010q3/008700.html
>>
>>
>> And there is clearly a second huge problem. The branch only used the
>> created .img files in order to make a new overview map. However that
>> defeats it's purpose.
>> The resulting overview map is used, and yes, it probably (though I'm not
>> even sure about it) speeds up Mapsource/Basecamp/Qlandkarte GT when
>> zoomed out, but the main problem remains. With all that low resolutions
>> in the actual normal .img files, there is no speedup for the GPS device,
>> where those low resolutions are a PITA.
>> So there needs to be a clear separation of overview map, vs normal map
>> in the resolution levels.
>>
>> Also it would be great, if for subsequent mkgmap runs with different
>> input data, the overview map data could be reused, and simply tiles
>> added without adding information. (e.g. you create one map, and want to
>> have it a) including contourlines b)without contourlines - so you need
>> to separate overview maps, one referencing the contourlines .img files,
>> one not referencing them. At the same time the map data of both overview
>> maps, should be the same of course and it would be a waste of time
>> running mkgmap twice just because now the overview map is not created
>> from the standard *.img files anymore).
>>
>> On 26.03.2013 10:56, GerdP wrote:
>>> Minko-2 wrote
>>>> If I look at your overviewmap the coastline seems still very detailed.
>>>> How many tiles is this overview map (just one?).
>>>> Is it possible to use another shape for the continent(s) or maybe a
>>>> filtered
>>>> osm coastline that throws away all the small details like islands and
>>>> stuff?
>>>>
>>>> Is it possible to update this branch version so we can experiment a bit
>>>> with the overview map?
>>> It is one tile with < 5 Mb.
>>> The branch is r1666 and t1659 was merged with trunk, so I can try to
>>> merge
>>> current trunk with the old code, but first I'd like to know why
>>> development
>>> was stopped.
>>>
>>> Gerd
>>>    
>>>
>>>
>>>
>>> --
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>> -- 
>> keep on biking and discovering new trails
>>
>> Felix
>> openmtbmap.org & www.velomap.org
>>
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>
>
>
>
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-- 
keep on biking and discovering new trails

Felix
openmtbmap.org & www.velomap.org