[mkgmap-dev] is_in filter

Sat Feb 4 15:18:38 GMT 2017

Hi Carlos,

I see a performance problem if mkgmap has to evaluate that for each element.
I think it would be better to have a special tag like mkgmap:remove-if-in=<type>
which would tell mkgmap to find out if the object lies (completely) within a polygon
that has the given type. This can happen after processing all polygon elements.
The polygons with the given type(s) could be placed in a spatial index if performance impact
is too heavy.
Do you think that would work as well?

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <cdavilam at orangecorreo.es>
Gesendet: Samstag, 4. Februar 2017 16:06:20
An: Development list for mkgmap
Betreff: [mkgmap-dev] is_in filter

One matter that has been discussed several times on this list is the
need to remove buildings. While removing buildings is becoming
absolutely necessary in many cities, due to massive building imports, it
may be quite convenient to keep them at rural or low densely populated
areas. Would it be possible to have a filter to know if a building is
inside/outside an area tagged landuse=residential, so that a different
rendering may be applied. Ideally area size could be also evaluated.
Perhaps some logic currently existing in mkgmap, used to assign
addresses from bounds, could be reused.

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