On Sun, Jul 29, 2018 at 1:57 PM, Warin <61sundow...@gmail.com> wrote:
I too have created relations for tree areas and made 'holes' in them for > various things. Some of those 'holes' may > well be 'bare map'. > [...] > The problem with the present data in this area is that; > > a) it does not render so 'we' don't know it is there by looking at the > rendered map. > That's the only problem. Your points b and c aren't problems (well, not the problem at immediate issue), they're the reasons why problem "a" exists. > I could add a tag - say a "comment=from HOT contribution, tagged > landuse=clearing" .. that should suffice. > You could do that. You could even retain the landuse=clearing tag, since it does no real harm, and comment that you've retained it in case it has local meaning that isn't documented on the wiki. Or you could do none of those things and just incorporate the area, with no tags, into a multipolygon on the basis that is clearly what was intended. If you wanted, you could also add a fixme stating that the nature of the clearing needs to be determined, so that people who look at validators might be tempted to go and look. > In OSM 'we' try to tag what is on the ground, "landuse=clearing" to me > means a lack of something - not what is there, but what is not there. And > that is not something I'd even think about trying to render. > Landuse=clearing in the middle of woodland means "not trees" and can be rendered by using a multipolygon to prevent trees rendering in that area. It would be nice to know what actually is there, but at least you can show that trees aren't there. A rambling diversion here, that will rejoin the main trail at the end. In the 1920s Alfred Korzybski came up with a self-improvement/therapy program he called "General Semantics" (nothing I say here should be taken as an endorsement of it). It had a key point to remind people that our knowledge and understanding of reality is only an approximation to reality: "The map is not the territory." OSM is only an approximation to the real world. I try to improve that approximation, where possible. Sea everywhere is an approximation. An island in the sea is a better approximation. Adding woodland to the island is a better approximation than that. Poking a hole in the woodland is an even better approximation. Tagging what that clearing is (scrub/grass/rock/whatever) is an even better approximation. I don't let the fact that I can't achieve perfection stop me from improving what is there. I'd have changed that landuse=clearing to an inner in a multipolygon without bothering to say anything here. If the imagery had contradicted the tagging, I'd have left it alone, but if the imagery shows "not trees" then map "not trees." -- Paul
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