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前言 类型中心抽样调查法是当前我国森林资源调查的一种新型方法。它是建立在森林资源概知的基础上,可以根据小班档案或遥感信息资料,分别小班类型,依概知平均数抽取极少的样本单元就能获得一定精度的总体标志值。 类型中心抽样较客观地吸取了典型调查和随机抽样的优点。它将我国传统的典型调查与随机抽样结合起来,把典型调查与统计分析融为一体,使典型调查建立起精度分析系统,有了进行比较分析的可能。这样可以提高典型调查的应用价值,发挥典型调查快速、省工的优势,大大减少了调查人员的外业工作量。因此,有必要在原有的基础上对类型中心抽样在理论上和应用方面进一步研究。 本次实验的特点主要是将3p抽样法(Probability Proportional to Prediction)和众数抽样法引入类型中心抽样中来,使它进一步发挥高效率的作用,把类型中心抽样组成一种调查体系。 本次试验的目的:1.在被抽中的小班内,采用角规点抽样、角规线抽样和常规带状样地组成三套样本,通过比较,选择最优样本单元;2.把3p抽样引进类型中心抽样体系,利用3p样本估测总体蓄积量、生长量(率)和出材量(率),以消除应用数表和调查总体的不一致性而引起的误差。
Preface Type center sampling survey is a new method of forest resources survey in our country. It is based on the overview of forest resources. Based on the data of small-scale files or remote sensing information, each sub-class type and the average sample-based average number of samples, we can get a certain overall mark value. Type center sampling more objectively learned the advantages of a typical survey and random sampling. It combines the traditional Chinese typical survey with random sampling, and integrates the typical survey and statistical analysis, so as to establish a precision analysis system for typical survey and make it possible for comparative analysis. This will enhance the value of the typical survey, give play to the advantages of a typical survey in a fast and labor-saving manner, and greatly reduce the workload of investigators in the field. Therefore, it is necessary to further study the type center sampling on the basis of the original theory and application. The main feature of this experiment is the introduction of 3P sampling method (Probability Proportional to Prediction) and the method of mode sampling into the type center sampling to make it play a more efficient role and form a survey system by type center sampling. The purpose of this experiment: 1 in the small class was drawn, the use of angle gauge point sampling, corner gauge sampling and conventional band sample composed of three sets of samples, by comparison, select the optimal sample unit; 2 3p The sampling type center sampling system was introduced by sampling, and the 3p samples were used to estimate the total volume, growth rate and output rate (rate), so as to eliminate the errors caused by the inconsistency between application and survey population.