Creation subobject by copying contour of existing object
The mode Creation subobject by copying contour of existing object will be used for the co-ordination of an internal contour of polygon object with the earlier built object (for example you want to draw forest glade that has exactly the same border as already digitized lake in this forest etc.). For creation of an inner border of polygon object it is necessary sequentially to select object - source (object, the outer border which one will be an inner border for edited object, lake in this case) and edited object (forest).
The mode Creation subobject by copying contour of existing object will be used for the co-ordination of an internal contour of polygon object with the earlier built object (for example you want to draw forest glade that has exactly the same border as already digitized lake in this forest etc.). For creation of an inner border of polygon object it is necessary sequentially to select object - source (object, the outer border which one will be an inner border for edited object, lake in this case) and edited object (forest).