几种网格数据处理方法的应用与评述

对于利用网格布点所测得数据的处理,可采用积分法、趋势面法、多项式法和平均值法,各种处理方法各有其特点。平均值法计算简单,各个网格权重相同,意义明了,但精度不高;积分法和趋势面法考虑到了位于中心的网格对整个区域的贡献率大,组成的三角形多,统计时利用次数就多,边缘的网格数据利用次数少,物理意义明确。积分法还可计算总量,趋势面法可以在图上表示区域分布及变化趋势;多项式法除了计算其平均值外,还可模拟测定值,可计算测得数值序列趋势值和偏差值,分析污染物分布及变化情况。使用时要根据分析对象的物理意义及研究目的不同,选择不同的数学模型和计算公式。

Application and Review on Treatment Methods about Several Kinds of Grid Data

The methods of integration,trend aspect,multinomial and average value may be used for the treatment of data measured with grid distribution method,with each method with its own characteristics.The method of average value is easy in calculation and each grid has the same weighting,but the precision is not high.In the methods of integration and trend aspect,the centre grids are used many times due to their high contributing proportion for whole region and constituent many triangles,while the edge grids are used few times,which is distinct in physical meaning.The method of integration may be used to calculate total amount,and the method of trend aspect can be used to show area distribution and variation tendency on a graph.Multinomial method can be used to imitate measured value and to calculate trend and deviation value of the data sequence and to analyze the distribution and diversification of contamination.Mathematical models and computing formulas would be selected according to different research purposes and physical meaning of analytic targets when it is used.