<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="gmail_quote"><div class="im">On Fri, Jun 22, 2012 at 6:37 PM, Rich Shepard <span dir="ltr"><<a href="mailto:rshepard@appl-ecosys.com" target="_blank">rshepard@appl-ecosys.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
The r.basin wiki page tells me, "The prevalent orientation: in GRASS the<br>
aspect categories represent the number degrees of east and they increase<br>
counterclockwise: (90deg is North, 180 is West, 270 is South 360 is East).<br>
The aspect value 0 is used to indicate undefined aspect in flat areas with<br>
slope=0. We instead calculate the orientation as the number of degree from<br>
north, increasing counterclockwise."<br></blockquote></div></div></blockquote><div><br>And, I am sorry, this is the definition of aspect, not of the prevalent orientation, my mistake in the documentation, I'm fixing it.<br>
</div><br></div>-- <br>Dr. Margherita Di Leo<br>