<div dir="ltr">Hi all,<div><br></div><div>Just now it comes to my attention (sorry):<br><div><br><div>last years I went to a statistical session where the ESRI coders of the krigging module</div><div>talked about 'issues' of the implementation there, and it was beyond scary for me</div><div>(=>assumptions, merging outputs, edge issues etc. Krigging as such is pretty sensitive to</div><div>underlying assumptions and data).</div><div><br></div><div>So my question is: </div><div>what is the science-basis for krigging in QGIS ?</div></div><div><br></div><div>Or asked other way round: </div><div>how can it be assured that the krigged results are meaningful and correct ?</div><div><br></div><div>If there is none of such metrics to assure it, then it's just another of the many</div><div>shiny tools and 'homebrews' (not peer-reviewed and QA'ed really) out there that mis-inform.</div><div><br></div><div>Like well-shown with home range analysis, kernels, random number generators, optimizations and many predictions and model</div><div>selection tools, one may then ignore those outputs for a serious analysis.</div><div><br></div><div>The initial idea of open source was arguably that those things can be tested, and improved, yes ?</div><div><br></div><div>I am open to hear feedback, examples and ideas for a betterment.</div><div><br></div><div>Thanks so much; kind regards</div><div> Falk Huettmann</div><div><br></div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 27, 2018 at 11:39 PM, PARESH CHAUKHANDE <span dir="ltr"><<a href="mailto:paresh.chaukhande@gmail.com" target="_blank">paresh.chaukhande@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 style="word-wrap:break-word;line-break:after-white-space">Hello,<div> I am using QGIS v3.0.3 on macOSX(High Sierra). </div><div> I want to do ordinary kriging in QGIS.</div><div> I have 13 data points representing a state of yield attributes of agricultural crops. I am also having .shp files of states. I am doing following steps:</div><div> <span style="color:rgb(59,64,69);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:13px;background-color:rgba(248,248,248,0.6)">Processing> Toolbox> SAGA> </span><span class="m_-57947414962710718result-highlight" style="margin:0px;padding:0px;border:0px;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-weight:bold;font-stretch:inherit;line-height:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit;color:rgb(12,13,14);background-image:none">Ordinary</span><span style="color:rgb(59,64,69);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:13px;background-color:rgba(248,248,248,0.6)"> </span><span class="m_-57947414962710718result-highlight" style="margin:0px;padding:0px;border:0px;font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-weight:bold;font-stretch:inherit;line-height:inherit;font-size:13px;vertical-align:baseline;box-sizing:inherit;color:rgb(12,13,14);background-image:none">Kriging</span><span style="color:rgb(59,64,69);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:13px;background-color:rgba(248,248,248,0.6)">. The process runs OK and two new layers are created called Quality Measure and Prediction, but both these layers are invisible or show no information.</span></div><div><span style="color:rgb(59,64,69);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:13px;background-color:rgba(248,248,248,0.6)"> Kindly help me on these issues.</span></div><div><span style="color:rgb(59,64,69);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:13px;background-color:rgba(248,248,248,0.6)"> Thank you.</span></div><div><span style="color:rgb(59,64,69);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:13px;background-color:rgba(248,248,248,0.6)"><br></span></div><div><span style="color:rgb(59,64,69);font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:13px;background-color:rgba(248,248,248,0.6)"><br></span></div><div><font color="#3b4045" face="Arial, Helvetica Neue, Helvetica, sans-serif" size="2"><span>Sincerely yours,</span></font></div><div><font color="#3b4045" face="Arial, Helvetica Neue, Helvetica, sans-serif" size="2"><span><br></span></font></div><div><font color="#3b4045" face="Arial, Helvetica Neue, Helvetica, sans-serif" size="2"><span>PARESH CHAUKHANDE</span></font></div></div><br>______________________________<wbr>_________________<br>
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