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The purpose of the Data Files screen is to specify the source of the data for the current problem. This step is compulsory if a new problem is being composed using FOLPI input files and has to be completed before other sections of LOG can be accessed if the New From FOLPI option has been selected. Alternatively, the Data Files form can be accessed at any stage in the program using the ‘Tree Directory’. In this instance, the Data Files form allows users to change the data files used in the current LOG problem without changing any other features of that problem.
Note that changing the data files of an existing problem should be done with care as the LOG problem may refer to specific croptypes and/or products which are not contained in the new data files.
Clicking on one of the FOLPI data buttons, for example the ‘Area File’ button, will open a common Open screen which allows the user to browse and then open the appropriate file. FOLPI data files are in the .dat format.
After opening a FOLPI data file, LOG automatically converts the data into the LOG database format and saves the information within a temporary LOG Data file. Note that to have this data saved in the actual LOG Data File it is necessary to either select Save Data on the Data Files screen, or alternitively from the File menu.
The screen below shows the LOG data files screen.
The Area file contains the initial areas of aggregate forest stands divided by croptype and age class. This file is needed in order to construct a model.
The Overhead file contains information about costs or revenues that occur regularly and is based on the residual areas standing at the end of each period. This file is optional.
The Plant file contains information about costs and revenues associated with replanting and the selling and purchasing of land. This file is also optional.
The Products file contains information about the various yields, revenues and costs obtained from the different croptypes. The yield information in this file is only used in the report, the revenue and cost information is needed in order to construct a model.
The Thinning file contains information about the costs of various silvicultural regimes. This is another optional file.
The Yields data file contains the predicted harvest volume of logs by croptype and age class. Yields data is compulsory.