Stratified sampling based on photo- interpreted forest types reduces the cost of strategic forest inventory
نویسنده
چکیده
This study assesses the effectiveness of stratification, based on photo-interpreted forest types, for strategic inventory. It uses results (from stratified sampling) for Total Merchantable Volume (TMV) in 18 Inventory Areas in Tasmanian State forest. The variance of the TMV as determined from stratified sampling is compared with the estimated variance of a simple random sample using the same number of plots. The numbers of additional plots required to obtain, without stratification, estimates with the same variance as the stratified estimates are then computed. Annual savings due to reduced plot numbers are estimated at about $75 000.
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