基于多项污染物综合相对重要性的主成分子集合环境测点优选法

Optimization of environmental monitoring sites by principal component subset selection based on comprehensive relative importance of pollutants

根据对多项污染物环境测点的优选，提出了单项污染物测值的相对重要性和多项污染物测值的综合相对重要性新概念，并给出了综合相对重要性的计算公式．根据测点的综合相对重要性，再用主成分子集合选择法优选测点该方法与基于交叉相关性的主成分子集合优选法相比，不仅减少了计算量，而且避免了当各单项污染物选出的测点不一致时，难以确定公共优化点的困难．该方法用于成都市大气污染物的12个测点优选结果符合实际情况．

In order to select the optimal mumbers of environmental monitoring sites, new concepts of the relative importance on monitoring values of single pollutant wer advanced; and the formula of comprehensive relative importance was derived. On the basis of comprehensive relative importance of monitoring values of sites, the optimization of environmental monitoring sites was carried out by principal component subset selection. The advantages of this method not only reduce the calculation but also refrain from the difficulty of determining common optimal sites as a result of coincidenceless of optimal sites selected from single pollutant, as compared With the optimization of principal component subset selection based on the cross-correlation. The results of optimization from 12 monitoring sites of armospheric pollutants in Chengdu Urban coincide with the practical cases.