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<div>Apr 6, 2022, 20:22 by gdt@lexort.com:<br></div><blockquote class="tutanota_quote" style="border-left: 1px solid #93A3B8; padding-left: 10px; margin-left: 5px;"><div><br></div><div>Yves via talk <talk@openstreetmap.org> writes:<br></div><blockquote><div>I wonder if using defaults from an external database (let say we have<br></div><div>it) and analyse it with our boundaries is really more efficient than<br></div><div>tagging everything?<br></div></blockquote><div><br></div><div>I don't understand how you can think that. Simplifying, there are two<br></div><div>paths forward:<br></div><div><br></div><div> A) Don't produce a file that maps regions to defaults and promulgate its<br></div><div> use. If a property is not tagged, apply some global default from the<br></div><div> wiki. Encourage everything to tag every property always.<br></div><div><br></div><div> B) Produce the file and use it.<br></div><div><br></div><div>To talk about efficiency, we need to estimate both the total amount of<br></div><div>effort, and the result in terms of accuracy of rendered information. It<br></div><div>seems obvious that B leads to much better results with less total<br></div><div>effort. Producing the file probably only takes 1000 hours and using it<br></div><div>per rendered another 100 or so. Tagging every road, done honorably,<br></div><div>would take a very long time.<br></div></blockquote><div dir="auto">The problem is: what about places differing from assumed default?<br></div><div dir="auto">And where applying such defaults produces incorrect data?<br></div><div dir="auto"><br></div><div dir="auto">Without systematic tagging of info, including "obvious" values it<br></div><div dir="auto">is much harder to systematically map and catch such cases.<br></div><div dir="auto"><br></div><div dir="auto">In addition: note that there are more options than<br></div><div dir="auto">"tag explicitly" vs "use defaults"<br></div><div dir="auto"><br></div><div dir="auto">There is at least also <br></div><div dir="auto">"tag explicitly, if nothing is tagged guess based on reasonable assumptions".<br></div><div dir="auto"><br></div><div dir="auto">This way data consumers have something (and most use this strategy,<br></div><div dir="auto">see roads without oneway tag set) but things can be systematically mapped.<br></div><div dir="auto"><br></div> </body>
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