磁测中充分采样的重要性

充分采样对于航空磁测或地面磁测(无论是总场测量还是垂向梯度测量)进一步的图象处理和图象增强处理以及磁异常的解释都极为重要.其原因是测得的全部资料都是连续异常场的离散数据集.利用典型的二维岩脉模型来进行理论计算,将场源-探头的距离来代替场源埋深.通过一系列的理论计算和研究分析,作者认为:在大比例尺的高精度航空磁测中,沿测线方向的测点采样间距应小于或等于飞行高度的一半;而测线之间的距离不大于飞行高度.作者最后还引用了两个应用实例.

THE IMPORTANCE OF FULL SAMPLING INMAGNETIC SURVEY

In aeromagnetic survey or ground magnetic survey(whether in total fieldsurvey or vertical gradient survey), full sampling seems extremely importantfor further image processing and image enhancement processing as well asinterpretation of magnetic anomalies. The reason is that all the data obtainedare discrete data set of continuous anomalous field. By applying typical two-dimensional dyke model to conduct theoretical calculation, we used the dis-tance between the field source and the probe to replace buried depth of fieldsource. Based on a series of theoretical calculations and analyses, the authorholds that in large-scale high-precision aeromagnetic survey, the samplinginterval between stations along the survey line should be shorter than orequal to half of the f;ying height, whereas the distance between the surveylines should not exceed the f;ying height.Two application examples are given in this paper.