Issues Medit
Optimization of the forest volume estimation with plot-double sampling when there is a walking cost of the second-phase sample
Medit, vol 8, n.3, (September 1997), pp. 23-26
Language: ENThe Lagrange multiplier method was applied for estimating the forest volume at minimum cost by plot-double sampling. A composite cost function was used which has also included the walking cost of the second-phase sample. Compared to the plot sampling the error was increased per 10,45% and the cost decreased per 7,35%. When the volume measurement cost is increased a significant decrease of the total cost of the plot-double against plot sampling is observed.
La méthode multiplicatrice de Lagrange a été appliquée pour estimer le volume des forets au moindre cout par l'échantillonnage "plot-double". Une fonction de coût composée a inclus aussi le cout de marche de l'échantillon de la deuxième phase. Par rapport à l'échantillonnage "plot", l'erreur a augmente de 10,45% et le cout a baisse de 7,35%. Lorsque le cout de la mesure de volume augmente, le cout total du "plot double" diminue d'une manière significative par rapport à l'échantillonnage "plot".
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