Difference between revisions of "Treatment Program Generator Design"
Jump to navigation
Jump to search
| Line 19: | Line 19: | ||
== Creating Even Aged Treatment Programs == | == Creating Even Aged Treatment Programs == | ||
| − | + | Creating even aged treatment programs is more complex. A number of generations of the forest has to be created (a forest generation starts with regeneration and ends with final felling). An even aged treatment program must contain at least one complete generation, even if the planning horizon is shorter (net present value cannot be calculated if not a complete generation is present). | |
| − | + | ||
| − | + | Even aged treatment programs are created based on treatment specifications (specifying when cleaning, first thinning, and final felling should be done) and fertilization policies (specifying if and how fertilization should be done). During the generation, a number of treatment specifications are evaluated, but the same fertilization policy is always applied for a given generation and control category. The latter also applies to regeneration. | |
| − | + | ||
| − | + | Each forest domain contains one or more control categories. For each control category, it is specified if the control category is to be used in generation 1, generation 2 (and forward), or both. Treatment programs will be generated for each control category in the generation being in progress. | |
| − | + | ||
| + | The diagram below illustrates the process for treatment program generation: | ||
| + | |||
| + | [[file:tpg.png]] | ||
| + | |||
| + | Each time regeneration is performed the treatment unit is grown until the regeneration has been activated on all prediction units (e.g. there are no waiting saplings). | ||
| + | |||
| + | Treatment specifications will be created each time a generation is to be completed. Then a treatment program is created for each treatment specification, up to and including a final felling treatment. Then a fertilization policy is applied if required (not shown in the figure). | ||
| + | |||
| + | Each treatment program is then checked, is the planning horizon reached and has at least one complete generation been created? If not a new generation is started. The figure above shows how new generations are simulated, there are also other (faster) possibilities to create new generations, described below. | ||
| + | |||
=== Creating Treatment Specifications === | === Creating Treatment Specifications === | ||