多个随机起点的双重回归系统抽样的森林调查方法是为美国滨湖各洲和加拿大中部某些林区设计的。这些林区的特点是:经营强度不高、面积辽阔、林分大致相同而且连成大片,这个方法在其他相似 Multiple Random Origins of Dual Regression Systems Sampling forest surveys were designed for certain forest areas in the United States, Lakes and Lakes and in central Canada. The characteristics of these forest areas are: operating intensity is not high, vast area, roughly the same forest and even into large tracts, this method is similar to other similar