To build a zone around of linear object

This mode is intended for creation of polygon (square) object, in the form of a buffer zone of the specified width. It is necessary for user to choose initial linear object of a map. After a choice of object the dialogue will appear in which it is necessary to specify:    

 -  width of a buffer zone in meters;    

 -  map onto which the object will be put;    

 -  type of created polygon object.