Model-based Error Grids and Satellite-derived errors for the World Magnetic Model (WMM)

1) The first part (*.mat) of the dataset contains the final processed error grids and global altitude profiles for the World Magnetic Model (WMM) as presented in the manuscript "Global geomagnetic model errors as a function of altitude and geomagnetic activity." The errors, combining both omission and commission sources, were calculated on a 3D grid (10∘×10∘ latitude/longitude) at 29 discrete altitude levels from the Earth's surface to 10,000 km. The dataset is binned by five levels of geomagnetic activity (G0-G4). These results were generated by synthesizing outputs from established models for the crustal (EMM), ionospheric (AMPS, DIFI), and magnetospheric (T89) fields. The data are provided in MATLAB .mat file format, with variables corresponding to each activity level and magnetic field component. 2) The second part (*.txt) of the dataset provides processed root-mean-square (RMS) errors of the World Magnetic Model (WMM) derived from satellite observations, used for validation in the manuscript "Global geomagnetic model errors as a function of altitude and geomagnetic activity." The data are sourced from the CHAMP, Swarm A, Swarm B, and CryoSat-2 satellite missions spanning 2005-2024. The processing methodology includes subtracting the relevant WMM version, binning the residuals by geomagnetic activity level (G0-G4), removing outliers, and correcting for secular variation (SV) forecast error using the CHAOS-8.2 model. The final data are provided as a set of ASCII text files, with values corresponding to the validation markers presented in Figure 5 of the associated publication.1) 本数据集的第一部分（*.mat格式）包含经最终处理的世界地磁模型（World Magnetic Model, WMM）误差格网与全球高度剖面数据，对应已发表论文"Global geomagnetic model errors as a function of altitude and geomagnetic activity"。该数据集的误差涵盖漏检与误报两类来源，在纬度/经度为10°×10°的3D格网上完成计算，覆盖从地球表面至10000 km的29个离散高度层。数据集按5个地磁活动等级（G0-G4）进行分箱处理。此类结果通过整合地壳场模型（EMM）、电离层场模型（AMPS、DIFI）以及磁层场模型（T89）的成熟输出合成得到。数据以MATLAB .mat文件格式提供，其中各变量分别对应不同地磁活动等级与地磁分量。 2) 本数据集的第二部分（*.txt格式）提供了基于卫星观测得到的世界地磁模型（WMM）经处理后的均方根（root-mean-square, RMS）误差数据，用于支撑论文"Global geomagnetic model errors as a function of altitude and geomagnetic activity"中的验证工作。该数据源自2005年至2024年期间的CHAMP、Swarm A、Swarm B以及CryoSat-2卫星任务。数据处理流程包括：扣除对应版本的WMM模型结果、按地磁活动等级（G0-G4）对残差进行分箱、剔除异常值，以及使用CHAOS-8.2模型修正长期变化（secular variation, SV）预报误差。最终数据以ASCII文本文件集形式提供，其数值对应关联论文中图5所示的验证标记点。