[mkgmap-dev] [PATCH v2] - round coordinates when zoomed out

Sun Nov 22 22:40:31 GMT 2009

> I don't think that this really matters. One will only use level 18 or 16 
> for orienation/map panning. Garmin City Navigator only goes down to 20, 
> then it's already basemap - of course in Mapsource they have a nice 
> filled overview map, which we are really missing. If we had a decent 
> overview map, I would have 18 as last level, as on my GPS I never use 
> level 17 or 16 cause it's too slow to be usable (even though it only has 
> motorways and trunk roads, plus cities more than 1Mio inhabitants or 
> Capitals.). Level 18 already could be much much more smoothed.
> 

This is one target I wanted to achieve with the dp filter. Smooth out the lines and therfore increase the drawing speed. 

For the dp filter to work usefull at low zoom levels it is neccessary to have long lines as inputs, i.e. motorways should be as one single line and not as hundreds of segemnts each only 1 km long. This should be achieved by the merge-lines patch. I have not watched, if the patch has made its way into the trunk. 

I will see after it.

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