<div dir="ltr"><div dir="ltr">On Fri, 10 Jul 2020 at 13:19, Warin <<a href="mailto:61sundowner@gmail.com">61sundowner@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>On 10/7/20 9:30 pm, Peter Elderson
wrote:<br>
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<div dir="ltr">Looks like humus is a component of soil. So I think
soil covers it, being a top layer consisting of mixed organic
and mineral matter.
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<div>To me it is hard to imagine an area as permanently
natural=bare_soil. Wouldn't there always be some kind of
vegetation within a year? <br>
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</p>Sorry to say but some soils have been so polluted combined with
the resulting soil erosion vegetation has taken some decades to
come back. <br>
<p>See <a href="https://en.wikipedia.org/wiki/Queenstown,_Tasmania#Ecology" target="_blank">https://en.wikipedia.org/wiki/Queenstown,_Tasmania#Ecology</a></p></div></blockquote><div><br></div><div>I don't see how an area that has suffered soil erosion can be mapped as bare soil,</div><div>I see from the Wikipedia article you cite that "[...] the erosion of the shallow horizon</div><div> topsoil back to the harder rock profile [...]" so we'd map that as bare rock,</div><div>wouldn't we?</div></div><div class="gmail_quote"><br></div><div class="gmail_quote">I'll take this opportunity to mention that some (not you) have suggested</div><div class="gmail_quote">that bare soil might happen through lack of rainfall, which is possible.</div><div class="gmail_quote">Others have then suggested that such cases could be mapped as</div><div class="gmail_quote">desert. Desert is an incredibly bad tag because it is not a surface,</div><div class="gmail_quote">or a land cover, or even a natural (as used in OSM), it's a CLIMATE.</div><div class="gmail_quote">Desert means a lack of precipitation (which usually results in</div><div class="gmail_quote">the land being barren. The Sahara (hot and sandy) is a desert, but so is</div><div class="gmail_quote"> arctic tundra. Whatever we settle on for this (if we settle on something),</div><div class="gmail_quote"> desert should not be the tag.</div><div class="gmail_quote"><br></div><div class="gmail_quote">I've just realized what prompted the back of my mind into writing the</div><div class="gmail_quote">preceding paragraph. landcover=barren (or natural=barren) seems</div><div class="gmail_quote">to handle things nicely without worrying about soil/clay/humus</div><div class="gmail_quote">distinctions.<br></div><div class="gmail_quote"><br></div><div class="gmail_quote">-- <br></div><div class="gmail_quote">Paul</div><div class="gmail_quote"><br></div></div>