Tree volume estimation to calculate forest fee is time consuming and costly. furthermore, long term stock cut logs under warm and humidity condition results in decay.The current study was done to develop regression model to estimate comercial volume of logs using independent variable such as diameter at breast height , the trunk and etc, in the compartments 313 and 314 in the Research and Educational Forest of Tarbiat Modares University. For this purpose, diameter at breast height (DBH), diameter at end of trunk (DET), the height of the tree trunk and total height of 101 trees were measured using the VERTEX and the Image Tools software. Volume of renewing and extraction operations using as dependent variables in volume estimation model designing. Results showed that in preparing model for the renewal volume operation, diameter at breast height and total tree height and in preparation model for extraction operation, diameter at breast height, diameter at the end of the trunk and trunk height are the most important variables.
