<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>There's an interesting question. </div><div><br></div><div>It is a "salt evaporation pond" , and it is a really old practice of making salt. the colorful south bay of san francisco is thanks to salt farming. </div><div><br></div><div>But is refining a mineral really farming? Refining is usually considered industrial - but it was practiced with basically seawater and a flat dirt area for a really long time. </div><div><br></div><div>But now most of the large ones to map are all part of industrial salt refineries. </div><div><br></div><div>Sounds like it would be part of an industrial subtag. </div><div><br></div><div><a href="http://en.wikipedia.org/wiki/Salt_evaporation_pond">http://en.wikipedia.org/wiki/Salt_evaporation_pond</a>.</div><div><br></div><div>Javbw</div><br><div><div>On Jul 26, 2014, at 1:24 PM, Mateusz Konieczny <<a href="mailto:matkoniecz@gmail.com">matkoniecz@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">2014-07-25 16:28 GMT+02:00 Martin Koppenhoefer <span dir="ltr"><<a href="mailto:dieterdreist@gmail.com" target="_blank">dieterdreist@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra">salt_ponds could also be considered a subtype of farmland (maybe depends on the case/scale).<br>
</div></div></blockquote><div><br></div><div>Why farmland? For me it seems clearly industrial process, certainly unrelated to growing plants. It is not like salt ponds are plughed.<br></div></div></div></div>
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