[OSM-talk-be] Land-use mapping with OSM in Belgium

[joost schouppe]

2017-04-27 13:14 GMT+02:00 Marc Gemis <marc.gemis at gmail.com>:

> On Thu, Apr 27, 2017 at 10:03 AM, joost schouppe
> <joost.schouppe at gmail.com> wrote:
> > So then you need to decide if a park in a residential area is a park or a
> > residential area.
>
> aren't park and residential area 2 different "layers" ?
>
> Yes, they were. But my use case was statistical analysis, not any kind of
map. I needed to pick just one landuse indication for as much land as
possible. So first I made the layers, then cut away areas from the "lower"
layers if they were also defined in the "upper" layers. But as you say,
that is not always straightforward.
And yes, I know the OSMlanduse project, though I finished mine before they
published anything.

The examples you give are already hard work to think about. Much more basic
mistakes are made too: e.g. a forest is also a nature reserve. But then
someone turns the forest into a multipolygon, because there is some water
or grassland inside of it. But the multipolygon is also used for the nature
reserve. Which would imply the holes in the forest are unprotected, and
that's usually not the case.

-- 
Joost Schouppe
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