Hello beenarus,Please check these two:http://www.agisoft.com/pdf/PS_1.2%20-Tutorial%20(BL)%20-%20Orthophoto,%20DEM%20(without%20GCPs).pdfhttp://www.agisoft.com/pdf/PS_1.2%20-Tutorial%20(BL)%20-%20Orthophoto,%20DEM%20(with%20GCPs).pdf