More practical critical height sampling.
This paper discusses the use of critical height sampling (CHS) in forest inventory. Simulation results indicated that importance critical height sampling (ICHS), antithetic importance sampling critical height sampling (AICHS), and horizontal point sampling (HPS) had lower standard deviations and therefore were more precise than CHS. Very notable is that the new methods, ICHS and AICHS, are equally as precise as HPS in which individual tree volumes are known without error. This is very important because the new methods, like critical height sampling, avoid bias inherent in volume equations or tables to which HPS is subject.