It looks very much like an out-of-memory error. In the gdb backtrace I see #4 0x00007ffff6601ebd in RTreeNewListBranch (t=0x609c30) at node.c:441 p = 0x0
which means that memory allocation failed. Try export GRASS_VECTOR_LOWMEM=1 r.to.vect --o --v input=seg_0.05_final@pietro output=seg005 type=area Markus M _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev