Hi Morten, Thanks for the prompt response, I was checking the help section and apparently there is a way to convert polygons to line, to get both roughnesses, the polygons option only has the internal roughness of each polygon, and as you mentioned is stored in a separate DBF file. We are evaluating another option, we have a matrix with, X and Y coordinates and its respective roughness, we have a code in Matlab to create a .map file that writes the coordinates of a squared polygon for each roughness value in the matrix and as we know the roughness and location of each matrix element we can write as well the left side roughness, it is valid this approach (using a roughness polygon per element in the matrix)? Thanks. Best regards Pedro