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[mkgmap-dev] is_in filter

From Felix Hartmann extremecarver at gmail.com on Tue Feb 7 21:20:04 GMT 2017

On 7 February 2017 at 21:54, Gerd Petermann <GPetermann_muenchen at hotmail.com
> wrote:

> looks simple enough, but what would be the rule to set the new special
> tags like mkgmap:urban?
> Do you think those could be calculated somehow using only the data used to
> compile the bounds file?
> If yes, please give more details.

well that's the hard part - I know. It could be a mix of several things -
best I could think of is densitiy of POI or density of addresses.

I'ld guess looking at density of POI and density of building=* - plus the
bigger the size of the building the more it has to be assumed it's urban
and some crosscheck with the bounds data would be enough. That should then
end up in a static file just like sea data and bounds. It would also of
course be possible to use that data to exclude buildings in cities - and
more ideas.

Even just density of POI and density of building=* (look at how much space
the building occupies - e.g. if inside a squared area more than 20% of
space is taken up by buildings - it's highly urban. 5-20% is a bit mixed,
<5% is rural.

Felix Hartman - Openmtbmap.org & VeloMap.org
Schusterbergweg 32/8
6020 Innsbruck
Austria - Österreich
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