>> I'd like to know if is it possible to import a TIN layer product by >Esri > ArcGIS. > > you could flip the TIN to a GRID and import it that way i presume TIN is just a surface of joined nodes so it would probably be more accurate to extract the node point data and reinterpolate using something better, e.g. v.surf.rst or v.surf.idw. Hamish