多批次数据地球化学图件编制的系统误差校正方法

Correction Method of Systematic Error in Preparation of Geochemical Map of Multiple Batches of Data

在编制大范围地球化学图件工作中,常需要多批次数据汇总拼接成图。各批次数据间的系统误差放映至图面上,元素含量等值线在各批次数据交界处易出现"台阶"现象。分别利用分幅标准化、衬度返回法、均值校正法、基于地球化学背景的多图幅系统误差校正等方法对某研究区5批次数据进行了系统校正后编制了地球化学图件。研究表明:在地质背景复杂、构造单元多元化的区域利用中位数计算地球化学背景的多图幅系统误差校正方法有一定的优越性。

In the preparation of large-scale geochemical map,it is usually to need multiple batches of data for mapping. The systematic errors between such batches of data are shown on the map surface,and the content isoline shows ＂ staircase＂ phenomenon at the interface of the batches. The division standardized method and contrast deduction method proposed by predecessors,and other methods such as mean correction method,multi-map system error correction method based on geochemical background are used for the preparation of the geochemical map of the five batches of data in a certain study region after correction of systematic error. The study results that the multi-sheet system error correction method by using the median calculation has certain advantages under geochemical background in the region with complex geological background and diversified tectonic units.