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用角规控制进行点抽样的实践表明,水平点抽样将产生蓄积偏差。有的刊物还用大量的实例,采用对比方法论证了存在蓄积偏小误差,使人们对此法运用生产产生了疑虑。为此,有必要从理论上进行研究。本文仅以一般简易角规测树产生样点位移,形成样园为不同心可变样园的原因,重点以活动杆随坡度逐株改平的方法为依据,在理论上进行探讨。至于坡度误差,缺口误差未列入探讨范畴。一、讨论的条件1.坡度改平原理为了使所测可变样园与实地可变样园相吻合,必须进行坡度改平,它的原理为L=50/cosα
The practice of point sampling with the angle gauge control system shows that the sampling of the horizontal spots will produce the accumulation deviation. Some publications also use a large number of examples, using comparative methods to demonstrate the existence of small accumulation of errors, so that people have doubts about the use of this method of production. To this end, it is necessary to study in theory. In this paper, we only use general simple angle measurement tree to generate sample displacements, and form the reason that sample-like garden is different-core variable sample garden. The key point is to discuss the theory in theory based on the method that the activity rod is flattened with the slope. As slope error, gap error is not included in the scope of exploration. First, the conditions for discussion 1. Gradient leveling principle In order to make the measured variable sample garden consistent with the field of variable sample, the slope must be level, its principle is L = 50 / cosα