Difference between revisions of "Import of stand register"
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A stand register usually includes, in each stand, average values and totals for several variables. However, models applied in the simulations of growth, treatments, etc. need initial forest state descriptions at the single tree-level. If not obtained in a forest inventory, e.g. according to [[Ivent]], such data can be simulated. Other inventory methods, and other simulation techniques (e.g. sample plot imputation), are available. E.g., remote sensing like airborne laser sensors may soon return (a sample of) single-tree data for large areas without great costs, but of great interest. | A stand register usually includes, in each stand, average values and totals for several variables. However, models applied in the simulations of growth, treatments, etc. need initial forest state descriptions at the single tree-level. If not obtained in a forest inventory, e.g. according to [[Ivent]], such data can be simulated. Other inventory methods, and other simulation techniques (e.g. sample plot imputation), are available. E.g., remote sensing like airborne laser sensors may soon return (a sample of) single-tree data for large areas without great costs, but of great interest. | ||
| − | In PlanStart randomly simulated... Weibull continuous probability density distribution... single trees with sizes (i.e. diameters at breast height) according to... The Weibull distribution share properties with many other distributions, | + | In PlanStart randomly simulated... Weibull continuous probability density distribution... single trees with sizes (i.e. diameters at breast height) according to... The Weibull distribution share properties with many other distributions, usually skewed with a right-side tail. Explained by the often occuring ... in a stand, there can be some, not many but much larger trees. On the other side, it is impossible that a stand show trees with negative diameters (zero is ok, indicating the occurrence of trees (saplings) with a height below 1.3 m). Properties common with the exponential and the normal distribution. Important for a diameter distribution is scale parameter (correponding to the tree species' DG) and the shape parameter, usually with a value of 1.5 - 5. |
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| + | [[http://en.wikipedia.org/wiki/Weibull_distribution|here]] | ||