<div dir="ltr"><div>Valter,</div><div><br></div><div>The default value for the skip= parameter is max(1, nrows/50, ncols/50), so the density of flowlines depends on the resolution of your elevation map. If you want better defined flowlines, reduce skip (skip=1 for all cells and best, but can be slow). I believe, in your case, those scattered flowlines all start from cells that are "skip" cells apart. I can see those short flowlines in a grid-like manner (distance between starting cells = max(1, nrows/50, ncols/50) by default). So try skip=1 (in UI, Optional => Number of cells between flowlines), then you should get better and continuous flowlines. The better result in one of your emails is a smaller region and a less number of rows and cells, so a smaller skip, I think.<br></div><div><br></div><div>Best,</div><div>Huidae<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 31, 2020 at 9:00 AM Valter Albino <<a href="mailto:valteralbino@gmail.com">valteralbino@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi,<div><br></div><div>It's done, running from GRASS GIS 7.8.2 GUI, in a Windows 64bits OS.</div><div>There ares differences when simulating for small areas or bigger areas, with default options.<br>When testing for bigger areas I wasn't setting the number of cells bettween flowlines & maximum number of segments per flowline.</div><div>Thanks</div><div><br></div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><span style="color:rgb(0,0,0)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif">Cumprimentos,</span></span></font></span><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><br>Valter Albino -</span></span></font></span></b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><b> </b>Geógrafo Físico, M.Sc.<span></span><span></span></span></span></font></span><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b><br><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b></div></div><div><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif">Modelação H&H / </span><span style="font-family:arial,helvetica,sans-serif">Riscos ambientais / OT&U<br></span></span></font></span></div><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><a href="http://www.valteralbino.wixsite.com/hydrodynamics" target="_blank">www.valteralbino.wixsite.com/hydrodynamics</a></span></span></font></span><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Valter Albino <<a href="mailto:valteralbino@gmail.com" target="_blank">valteralbino@gmail.com</a>> escreveu no dia quinta, 30/01/2020 à(s) 09:55:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><span style="color:rgb(80,0,80)">Hi Huidae</span><div style="color:rgb(80,0,80)"><span style="color:rgb(34,34,34)">Yes, the purple and black lines flow lines. Wondering if using units in "cm", instead of "m" gives correct results (the online manual sais that, i suppose) in terms of: more number and length of flow lines.</span> <br></div><div style="color:rgb(80,0,80)">Using r.flow (<a href="https://grass.osgeo.org/grass78/manuals/r.flow.html" target="_blank">https://grass.osgeo.org/grass78/manuals/r.flow.html</a>) with the following raster file:</div></div><div><div><img src="cid:ii_k60kacqs1" alt="image.png" width="539" height="290"><br></div></div><div>Sorry to moderator (sent 2 files with extra weight)</div><br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><span style="color:rgb(0,0,0)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif">Cumprimentos,</span></span></font></span><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><br>Valter Albino -</span></span></font></span></b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><b> </b>Geógrafo Físico, M.Sc.<span></span><span></span></span></span></font></span><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b><br><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b></div></div><div><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif">Modelação H&H / </span><span style="font-family:arial,helvetica,sans-serif">Riscos ambientais / OT&U<br></span></span></font></span></div><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><a href="http://www.valteralbino.wixsite.com/hydrodynamics" target="_blank">www.valteralbino.wixsite.com/hydrodynamics</a></span></span></font></span><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Huidae Cho <<a href="mailto:grass4u@gmail.com" target="_blank">grass4u@gmail.com</a>> escreveu no dia terça, 28/01/2020 à(s) 02:56:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Valter,</div><div><br></div><div>Which module did you use to generate flow lines? It wouldn't be easy to troubleshoot your problem without sample data and detail steps. Are those purple and black lines flow lines?</div><div><br></div><div>Best,</div><div>Huidae<br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jan 15, 2020 at 3:58 PM Valter Albino <<a href="mailto:valteralbino@gmail.com" target="_blank">valteralbino@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div>Is it normal results, scattered flow lines in a landscape with
altimetric amplitude of 50 to 60 meters (see following image). Is it an
erratic result?</div><div><br></div><div><br></div><div><div><img src="cid:ii_k5fsachr1" alt="imagem.gif" width="522" height="492"></div><div><br></div></div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><span style="color:rgb(0,0,0)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif">Cumprimentos,</span></span></font></span><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><br>Valter Albino -</span></span></font></span></b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><b> </b>Geógrafo Físico, M.Sc.<span></span><span></span></span></span></font></span><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b><br><b><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"></span></span></font></span></b></div></div><div><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif">Modelação H&H / </span><span style="font-family:arial,helvetica,sans-serif">Riscos ambientais / OT&U<br></span></span></font></span></div><span style="color:rgb(39,78,19)"><font size="1"><span style="background-color:rgb(255,255,255)"><span style="font-family:arial,helvetica,sans-serif"><a href="http://www.valteralbino.wixsite.com/hydrodynamics" target="_blank">www.valteralbino.wixsite.com/hydrodynamics</a></span></span></font></span><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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