<div dir="ltr">Hi there,<div><br></div><div>very good question indeed.</div><div><br></div><div>I have no direct answer but three more points to add:</div><div><br></div><div>-in virtually any GIS and software computations, SLOPE, ASPECT, IDW, KRIGGING etc.</div><div> one will find such type of questions, and many answers and solutions. None of them are</div><div> very clear and often not precise. Home range and Kernel computations are notorious for that.</div><div><br></div><div>-there is quite a mis-match with reality, and wrong perceptions, when it comes to such metrics,</div><div> tools, layers and GIS data.</div><div><br></div><div>-this does not only affect inference, but many management and real-world questions indeed, science, education,</div><div> certifications and publications included.</div><div><br></div><div>Overall, for a good software, these items are essential to have right and well documented; </div><div>the more the better. One wonders what the metadata really are for those metrics ?</div><div><br></div><div>Happy to learn more, thanks.</div><div><br></div><div>Kindly</div><div><br></div><div> Falk Huettmann PhD, Associate Professor</div><div> University of Alaska Fairbanks (UAF)</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div>-</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jul 24, 2017 at 6:25 AM, Mark Polczynski <span dir="ltr"><<a href="mailto:mhp.techforge@gmail.com" target="_blank">mhp.techforge@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>I have read <span style="margin:0px;line-height:107%;font-family:"Times New Roman",serif;font-size:11pt"><font color="#000000">Riley, S. J., S. D. DeGloria and R. Elliot (1999). A terrain ruggedness
index that quantifies topographic heterogeneity, Intermountain Journal of
Sciences, vol. 5, No. 1-4,1999, but might someone be able to tell me how the "Ruggedness Index" calculation is performed in QGIS? In particular, the "Z factor" seems to have no effect on the result. I have a passing familiarity with Python, so could probably figure out how the code works, if that would help the explanation.</font></span></div><div><span style="margin:0px;line-height:107%;font-family:"Times New Roman",serif;font-size:11pt"><font color="#b00000"><br></font></span></div><div><span style="margin:0px;line-height:107%;font-family:"Times New Roman",serif;font-size:11pt"><font color="#007600">Thanks!</font></span></div><span class="HOEnZb"><font color="#888888"><div><br clear="all"><br>-- <br></div><div class="m_-655130210268341157gmail_signature"><div dir="ltr"><div>Mark Polczynski</div></div></div>
</font></span></div>
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