Hallo, I want to inform you, that I update source code. It is completed about comments and I create simple wiki page, where you can read more about it. Source code: http://git.zcu.cz/svn/bakalarky/bezdek/ Wiki page: http://git.zcu.cz/wiki/index.php/UDig_-_Digital_Elevation_Model Greets Josef Bezdek