格值是地磁相对观测中极为重要的数值,它不仅直接关系到地磁日变曲线和特征值是否准确,而且还影响基线值的确定和对地磁短周期变化的研究。对于格值是否准确这一问题,在处理和分析资料时往往易被忽略。由于格值存在问题,就会导致前兆异常掺假,假异常的特征与地磁变化幅度有关。用掺假的地磁变幅预 Lattice value is an extremely important value in geomagnetic relative observation. It is not only directly related to whether geomagnetic diurnal curves and eigenvalues ​​are accurate, but also affects the determination of baseline value and the study of short-period changes in geomagnetic field. The question of whether grid values ​​are accurate or not is often overlooked when dealing with and analyzing data. Due to the grid value problems, it will lead to abnormal precursor adulteration, false anomaly characteristics and the magnitude of geomagnetic changes. Use adulterated geomagnetic amplitude pre-amplification