Stem Taper Approximation by Artificial Neural Network and a Regression Set Models
| Autor: | Pawel Netzel, Dominika Cywicka, Jarosław Socha |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
biology Artificial neural network Decision tree tree volume Forestry Statistical model 04 agricultural and veterinary sciences stem profile lcsh:QK900-989 biology.organism_classification 01 natural sciences Alder Regression Set (abstract data type) stem form Tree (data structure) Statistics 040103 agronomy & agriculture lcsh:Plant ecology 0401 agriculture forestry and fisheries stem taper modeling stem diameter at any height Beech 010606 plant biology & botany Mathematics |
| Zdroj: | Forests, Vol 11, Iss 1, p 79 (2020) Forests Volume 11 Issue 1 |
| ISSN: | 1999-4907 |
| Popis: | Variation in tree stem form depends on species, age, site conditions, etc. Stem taper models that estimate stem diameter at any height and volume should comply with this complexity. In the paper, we propose new methods taking into account both unbiased estimates and stem variability: (i) an expert model based on an artificial neural network (ANN) and (ii) a statistical model built using a regression tree (REG). We used the variable-exponent taper equation (STE) as a reference for these two models. Input data contain information about 2856 trees representing eight dominant forest-forming tree species in Poland (birch, beech, oak, fir, larch, alder, pine, and spruce). The trees were selected across stands varied in terms of age and site conditions. Based on the data, we built ANN and REG models and calculated both stem taper and tree volumes. The results show that ANN is a universal approach that offers the most precise estimation of stem diameter at a particular stem height for different tree species. The results for alder are an exception. In this case, the REG model performs slightly better than ANN. In terms of volume prediction, the ANN model provides the most accurate predictions for coniferous and beech. In general, flexibility and predictive performance of the ANN are better than REG and reference the STE equation. |
| Databáze: | OpenAIRE |
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