Developed by Kelly McCall and Geoffrey Smits



The following is an on-line user manual to accompany the current LOG software updated by Kelly McCall and Geoffrey Smits as part of their Management Science Honours Project in 2003. The current version of LOG is version 2, there are numerous changes to this later version. These changes are described in depth throughout this user guide.


LOG is an acronym for Linear Optimisation Generator. It is a forest estate planning program that is capable of modelling forest management and harvesting to maximise a particular objective. LOG is designed to assist forest managers with decisions such as the timing, scale and mix of what should be harvested, the area of new land to plant, what silvicultural regimes should be used and whether or not land should be replanted following harvesting.



Hardware      Pentium 600 or better

                   At least 128Mb RAM, depending on the size of the problem.

                   CD ROM drive
Software        Microsoft Access 2000 or later

                    Windows 2000 or later

                    AMPL version 20000209 or better

                    A LP solver capable of use in conjunction with AMPL.


Using the User Manual                       

Clicking on items from this screen will bring up corresponding information. The user can either click on the 'Next' button at the bottom of each screen to take the user to the next screen, or the the 'Return to Index' button can be click to take the user back to this screen.


Common functions such as ‘Save As’, ‘OK’ or ‘Cancel’ are typically enclosed in apostrophes as shown.


Items denoted in square brackets [ ], refer to keys on the keyboard. For instance, [TAB] or [ENTER].


New aspects or changes to the LOG 2.0 website or program are shown by a * to the right of the headings.

LOG Introduction Screen

LOG Databases

Navigating Through LOG

File and Options Menu

Problem Summary

Data Files

Define Products

Define Croptypes

Clearfell Ages

Replanting Simple*

Replanting Advanced*


Objective Function and Constraints

Non-Declining Yield Constraints

Smoothing Constraints

Cut Constraints

Replanting Constraints

Residual Constraints*

New Planting Constraints

Harvest By Year Constraints*

Residual By Year Constraints *



Other Changes to Version 2.0*

Possibilities of Further Extension*