<div dir="ltr"><div class="gmail_quote"><br>From: <b class="gmail_sendername">Graeme Fitzpatrick</b> <span dir="ltr"><<a href="mailto:graemefitz1@gmail.com">graemefitz1@gmail.com</a>></span><br>Date: 17 January 2018 at 16:10<br>Subject: Re: [talk-au] Deserts, mapping and sources<br>To: Warin <<a href="mailto:61sundowner@gmail.com">61sundowner@gmail.com</a>><br><br><br><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br></blockquote>
Deserts are a climatic concept:<br>
</blockquote></span>
A wetland too has a fuzzy boundary, much like a desert.<br></span><span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br><span class="">
What you should map is what you can see on the ground. So the Simpson Desert should be natural=sand, which is what you can see in the aerial imagery.<br>
</span></blockquote>
<br></span><span class="">
What is on the round in the Simpson Desert varies widely, but in general;<br>
In the swales between the sand dunes most of the time there is light scrub ... some times you find salt lakes (e.g. just west of Poepells Corner for instance).<br>
On the wester slope of the sand dunes you find some scattered scrub.<br>
On the eastern side of the sand dunes you find the occasional plant fighting the sand drifting over it.<br>
I'd be removing mapping of entire desert areas as sand or any other single land cover just based on the assumption that because it is a desert it must be covered by x.<div class="m_-6119349800423443024HOEnZb"><div class="m_-6119349800423443024h5"><br></div></div></span></blockquote><div>When Warin brought this up earlier I zoomed it on the marked "Simpson Desert" & switched to edit to see what it looked like (Just tried again but not now working for some reason?)</div><div><br></div><div>There's a line drawn across the landscape that says "Desert" on one side of it, but, to my uneducated eyes, there's absolutely no difference between the scrub on one side of the line & the other?!</div><div><br></div><div>& when you travel round the aerial image of that area, this part is rock, this looks like bare sand, quite a bit of low scrub, creek / river beds etc</div><div><br></div><div>Attempting to map each type of ground cover individually would be virtually impossible :-( </div></div></div></div>
</div><br></div>