Hi, WAsP runs without complaining because what you are doing is exactly what WAsP is meant for, i.e. the prediction of wind resources using measurements which might be at a different location and height. So if you are estimating a wind resource it means that at least you are doing horizontal extrapolation of the results (in most cases you will do both vertical and horizontal). In your particular case, all the WAsP models will be used as you first need to estimate a GWC which involves accounting for the topography effects on your tab location. Then you will re-account for topography effects (which will be different as you are at a different location and height) at each of your grid resource nodes and use the GWC to derive the climate/resource. While you do this, WAsP also uses the "background" wind profile, which is used for accounting of the vertical wind shear. So in order to know the uncertainty of all the process you need to know the uncertainty in each of the models of WAsP. Regards, WAsP support