<div dir="ltr"><div>Thank you Markus,</div><div><br></div>I used this data: <a href="https://drive.google.com/file/d/1xrLJY5aZLKE-ja51wKRX_CKKcUtIiy16/view?usp=sharing">https://drive.google.com/file/d/1xrLJY5aZLKE-ja51wKRX_CKKcUtIiy16/view?usp=sharing</a> (excluding band 6. I used band 1-5 as group)<div><br></div><div>The parameters:</div><div>i.segment.hierarchical group=S2bands_VV@LUPS thresholds=0.1, 0.2 output=hier_segmS2 minsizes=20 memory=4000 iterations=30<br></div><div><br></div><div>i.segment --overwrite group="S2bands_VV" output="SegmS2_02_20" band_suffix="Modified" threshold=0.2 radius=1.5 method="region_growing" similarity="euclidean" minsize=20 memory=4000 iterations=50 goodness= "goodn_of_fit_SegmS2_02_20"<br></div><div><br></div><div>g.region -p <br>projection: 1 (UTM)<br>zone: 21<br>datum: wgs84<br>ellipsoid: wgs84<br>north: 620222.920747<br>south: 617573.079721<br>west: 782605.544297<br>east: 785903.817009<br>nsres: 0.49997<br>ewres: 0.49996555<br>rows: 5300<br>cols: 6597<br>cells: 34964100<br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 18, 2019 at 5:04 PM Markus Metz <<a href="mailto:markus.metz.giswork@gmail.com">markus.metz.giswork@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"><br><br>On Tue, Jun 18, 2019 at 3:31 PM Jamille Haarloo <<a href="mailto:j.r.haarloo@gmail.com" target="_blank">j.r.haarloo@gmail.com</a>> wrote:<br>><br>> Dear Grass members,<br>><br>> I have been testing i.segment and i.segment.hierarchical on a small region with Sentinel bands. However, the results consistently include segments of just one pixel even-though minimal segment sizes of 10 and 20 were indicated. The final run with minsize 20 created 8247 segments.<br><div>> There were no errors nor warnings, and I couldn't find the i.segment script to review it.</div><div><br></div><div>It is here:</div><div><a href="https://github.com/OSGeo/grass/tree/releasebranch_7_6/imagery/i.segment" target="_blank">https://github.com/OSGeo/grass/tree/releasebranch_7_6/imagery/i.segment</a></div><div><br></div>> I also tried with a minsize of one (1). The result looks similar with even less segments created - a total of 8160. <br>> I tried with Grass Gis 7.6.0 and 7.6.1(download of yesterday).<br><div><br></div><div>I tested in the North Carolina sample dataset with</div><div>g.region -p rast=lsat7_2002_10</div><div><br></div><div>using default minsize 1<br></div><div>i.segment group=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40 thresh=0.05 out=lsat7_2002_min1</div><div>--> i.segment complete. Number of segments created: 29399</div><div><br></div><div><a href="http://r.info" target="_blank">r.info</a> -r lsat7_2002_min1</div><div></div><div>min=1<br>max=29399 <-- as expected<br></div><div><br></div><div>using minsize=20</div><div>i.segment group=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40 thresh=0.05 out=lsat7_2002_min20 minsize=20</div><div>--> i.segment complete. Number of segments created: 2114</div><div><br></div><div><a href="http://r.info" target="_blank">r.info</a> -r lsat7_2002_min20<br>min=1<br>max=2114 <-- as expected</div><div><br></div><div>r.stats -c lsat7_2002_min20 | sort -k 2n | head<br>1025 20<br>1081 20<br>109 20<br>1117 20<br>1220 20<br>1305 20</div><div><br></div><div>The given minimum segment size is in this test respected.<br></div><div><br></div><div>Can you provide test data, region settings and parameters for i.segment to reproduce?</div><div><br></div><div>Markus M<br></div><br></div>
</blockquote></div>