id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,cpu,platform 2856,"i.segment: warning ""Region consists of only one cell, nothing to update"" slows down module",mlennert,grass-dev@…,"In the NC dataset: {{{ g.region n=221318 s=220073 w=637746 e=639646 res=1 i.group ortho in=ortho_2001_t792_1m i.segment group=ortho@user1 output=ortho_seg_001 threshold=0.01 memory=2500 }}} Then, when I try to use the output of this as seeds for the next level: {{{ i.segment group=ortho@user1 output=ortho_seg_002_seeded threshold=0.02 seed=ortho_seg_001 memory=2500 }}} I get tons of {{{ WARNING: Region consists of only one cell, nothing to update }}} The module run takes +/- 1m25. When I comment [https://trac.osgeo.org/grass/browser/grass/trunk/imagery/i.segment/create_isegs.c#L1086 line 1086] in imagery/i.segment/create_isegs.c so that the warning is not issued, module run only takes about 20s. Is this warning really necessary ? Or is it a bug that it appears in this context ?",defect,closed,normal,7.0.4,Imagery,svn-trunk,fixed,i.segment region,,Unspecified,Unspecified