Hi Radim For smoothing lines you can use v.generalize tool from GRASS GIS or Generalizer plugin (which is based on v.generalizer). Regards Piotr Pociask -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Digitize-curves-tp5101672p5101772.html Sent from the Quantum GIS - Developer mailing list archive at Nabble.com.