2017-06-19 12:44 GMT+02:00 Christoph Hormann <o...@imagico.de>: > by the way is wrong. Nodes and areas are two abstract concepts within > OSM used to represent elements of reality. While there are features > that would normally be represented as areas that are occasionally as a > simplified representation mapped as nodes (like a lake) there are also > many things that are represented as nodes that should never be > attempted to be mapped as areas - either by convention (like > place=ocean) or due to their nature (like natural=peak). >
yes, features that are a spot in reality (like a peak) should be represented as a node. But already when it comes to very small areas, like an amenity=post_box or atm for example, mapping them as a node has some disadvantages (e.g. if the post box is attached to a building wall, you don't know whether the post box is inside or outside when the building is just an area (as opposed to walls etc. mapped in detail) and the post box is only a node). So clearly there is a tradeoff to be made, and we have to weigh in pros and cons to see what we recommend (and what mappers find practicable). In the case of a post box, a telephone booth, a drinking water fountain or an atm I guess there will not be much opposition to map these as nodes. When it comes to gates, benches and others, the situation might already change (often easier to map a gate as a linear way rather than estimating the width and add it as an attribute, especially if you want to add information about the orientation, like for the benches) For mapping an ocean or continent as a node there really aren't any good arguments besides technical limitations and the way we have structured our data (e.g. if the ocean boundary consisted of several segments (linear relations themselves) rather than a single multipolygon relation with ways as members, we could reduce the probability of editing conflicts to an amount that it would become possible to map them, similar to how we do with very long routes). Cheers, Martin
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