[mkgmap-dev] Overview map for Africa

Tue Mar 26 13:05:00 GMT 2013

Hi Felix,

you can try on your own. See the first post regarding my mkgmap parms, I did
not apply any
patches or changes to create that overview, I just compiled the branch
version and ran it
with --tdbfile and the existing *.img files.

Gerd

Felix Hartmann-2 wrote
> 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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>>> mkgmap-dev at .org
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>>
>>
>>
>>
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> 
> -- 
> keep on biking and discovering new trails
> 
> Felix
> openmtbmap.org & www.velomap.org
> 
> _______________________________________________
> mkgmap-dev mailing list

> mkgmap-dev at .org

> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev

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