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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hei,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Maybe a two-step approach with t.rast.aggregate and t.rast.mapcalc could work?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">In t.rast.aggregate you define the granularity as e.g. 48 days if you want to get a running median over three time steps of a 16 days time series.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">If you want to do it in one go (which would be understandable for heavy time series), I assume t.rast.algebra is your best bet. Here is an example on how to add a new function:
<a href="https://github.com/OSGeo/grass/pull/905/files">https://github.com/OSGeo/grass/pull/905/files</a> to the module (which admittedly is quit complex) (the d-falg helps with testing under development).<br>
You may have to invent a distinct pattern for aggregate functions from r.mapcalc…<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> grass-user <grass-user-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Veronica Andreo<br>
<b>Sent:</b> torsdag 28. januar 2021 16:43<br>
<b>To:</b> Nikos Alexandris <nik@nikosalexandris.net><br>
<b>Cc:</b> grass-user @lists.osgeo.org <grass-user@lists.osgeo.org><br>
<b>Subject:</b> Re: [GRASS-user] Median filtering time series in time only<o:p></o:p></span></p>
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<p class="MsoNormal">El jue, 28 ene 2021 a las 0:05, <<a href="mailto:nik@nikosalexandris.net">nik@nikosalexandris.net</a>> escribió:<o:p></o:p></p>
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<p id="gmail-m_-1904839209653549412reply-intro"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">On 2021-01-27 16:59, Veronica Andreo wrote:<o:p></o:p></span></p>
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<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Both r.series and t.rast.series will estimate the median per pixel in time (either for the whole series or the time period you want). Would it be possible then with so e sort of special for
cycle?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Sorry, I didn't pay attention. Reading more carefully.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Indeed, r.series (t.rast.series) do the median. But they will just create a single pixel for each pixel time series.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Then, as you write, it would take to hack-around a way to iterate over a given time series at the desired (number of) intervals, then compile a new time series.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">What is the 'e sort' part?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Did you mean to type 'with some sort of...'?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">And what does the 'cycle' refer to?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Sorry Nikos! I was writing from my phone and it gets messy sometimes. The intended sentence was: "Would it be possible then with some sort of special `for loop`?"
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Thanks, Nikos<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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