Usability of stands marked for cutting in timber supply to factories

A data system and a method for determining the harvestability and transportability of a stand marked for cutting， the method comprising: maintaining data on the properties of the soil of the stand; determining a value for the harvestability and transportability of the stand， which value is dependent on said properties; defining said value also on the basis of such conditions of said stand which affects said properties; maintaining data on the harvestability and transportability defined for the stand. Said property is one or more of the following: soil type， auxiliary attributes of the soil type， other permanent factors. Said conditions are one or more of the following: snow depth， frost depth， soil moisture content， temperature， amount of rainfall， quantity of growing stock， relations between tree species， other variable factors.