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一、三重抽样法的理论三重抽样法取下列的三种样本个数。 1 sL(一重样本): n (林分各层％的计算) 2 nd(二重样本): nL(象片上的判读) 3 rd(三重样本): ns(地上测定) 普通3rd(小样本)是2nd(大样本)的一部分,用该地上测定值与判读值来建立回归式。
First, the triple sampling method theory triple sampling method to take the following three samples. 1 sL for a single sample: n for each layer% 2 nd for a binary sample: nL 3 rd for triple: Is a part of the 2nd (large sample) and uses the above-ground measured value and interpretation to establish a regression.