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<div class="moz-cite-prefix">On 11/09/19 15:47, Mateusz Konieczny
wrote:<br>
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<div style="16px" text-align="left">11 Sep 2019, 01:54 by
<a class="moz-txt-link-abbreviated" href="mailto:pla16021@gmail.com">pla16021@gmail.com</a>:<br>
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<div style="16px" text-align="left">On Tue, 10 Sep 2019 at
23:41, Graeme Fitzpatrick <<a target="_blank"
rel="noopener noreferrer"
href="mailto:graemefitz1@gmail.com" moz-do-not-send="true">graemefitz1@gmail.com</a>>
wrote:<br>
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<div>Would it need a multipolygon? My impression of
the ODA is an open patch of ground in / beside a
residential area. If that is the case, wouldn't it
be much simpler to just mark a new area in as
landuse=o_d_a? (accept it wouldn't be abbreviated) <br>
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<div>Overlapping landuse often works, but only because the
carto people juggle z-indexes<br>
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<div>to make it work. They're not overly happy doing that,
I believe. <br>
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<div style="16px" text-align="left">well, reality is that
sometimes area<br>
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<div style="16px" text-align="left">is actually both tree-covered
area and<br>
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<div style="16px" text-align="left">for example university or
residential area.</div>
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Trees are a land cover, not necessarily a land use. <br>
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Universities and residential areas are a land use. <br>
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<div style="16px" text-align="left">It also doesn't always<br>
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<div>work well: if ever you've put a pond in a wood without
a multipolygon you get<br>
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<div>waterlogged trees. <br>
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<div style="16px" text-align="left">this is intentional to
encourage correct<br>
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I wish there was more rendering that showed errors. <br>
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<div style="16px" text-align="left"> It also makes database
queries somewhat more simpler if you're<br>
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<div>asking what is at point A and you get one answer rather
than two answers, or one of<br>
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<div>two answers chosen at random.<br>
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<div style="16px" text-align="left">note that in many cases
getting two<br>
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reality</div>
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Or even 3..<br>
Land cover e.g sand<br>
Land use and e.g. quarry<br>
Land form e.g. dune<br>
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<div style="16px" text-align="left"> A multipolygon is a
little more work for the mapper,<br>
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<div>but not much more.<br>
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<div>Now I expect both the carto and db people to tell me
I'm wrong about that. If they do,<br>
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<div>I'll just point out that it's not wrong to use a
multipolygon for this<br>
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<div style="16px" text-align="left">and in even more cases
multipolygon<br>
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Many people have problems with multipolygon relations.. <br>
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