Belay

I am working with WAsP for Wind resource assessment in selected regions of Ethiopia. WAsP uses roughness map of a terrain and as a result I use Global mapper for creating roughness map of a site automatically. I have already create the roughness grids from Land cover and export it in WAsP format but the roughness map couldn't be imported in my WAsP software. Could you tell me the correct procedures so as to create roughness map and export in WAsP format  
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