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正交试验设计法目前在森林资源调查中已有应用。笔者对正交试验设计与航片判读相结合的方法进行了探讨。认为此法最大优点可以大量减少外业工作量,节省财物力和人力,且有一定的精度保证,潜力很大。 目前,在我国森林资源调查中常用的航空照片比例尺大都在五万分之一到三万分之一。此规格航片对优势树种或优势树种组,龄组,郁闭度,坡度级,坡向,坡位比较容易判读,但对树高、胸径很难判读准确。我们把易判读因子安排在正交设计表上,从而来推算各种不同类型林分的平均蓄积量。
Orthogonal experimental design method currently used in forest resources survey. The author discusses the method of combining orthogonal experiment design and aerial interpretation. The biggest advantage of this method is that this method can greatly reduce the workload of the field, saving financial resources and manpower, and have a certain degree of accuracy assurance, great potential. At present, aerial photo scales commonly used in forest resources surveys in our country mostly range from one in 50,000 to one in 30,000. The aerial photos of dominant species or dominant tree species group, age group, canopy density, slope grade, slope orientation and slope position are easy to interpret, but it is difficult to interpret tree height and DBH accurately. We arrange the easy-to-read factors on the orthogonal design table to calculate the average stock volume of different types of stands.