A roughness map is a set of contour lines or pixel points defining the different types of vegetation or obstacles existing in the area of affection of a wind farm. The most important factor when building a quality roughness map is that the map reliably reflects the existing vegetation in our project site. Our experience tells us that only hand-digitized maps meet this condition and that is why at Nayxa only our engineers prepare the roughness maps, leaving aside the automatic algorithms and processes.