National Gravity Compilation 2019 includes airborne (CSCBA 1VD)

Gravity data measure small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.This National Gravity Compilation 2019 includes airborne (CSCBA 1VD) is the first vertical derivative of the complete spherical cap Bouguer anomaly grid for the 2019 Australian National Gravity Grids B series. This gravity survey was acquired under the project No. 202008. The grid has a cell size of 0.00417 degrees (approximately 435m). A Fast Fourier Transform (FFT) process was applied to the original grid to calculate the first vertical derivative grid.

重力数据用于测量因地球表层下方岩石密度变化引发的微小重力场变化。所采集的数据将通过标准流程进行处理，以确保记录得到的响应仅源于地下岩石的影响。经处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量核查，以确保GA发布的最终数据符合使用要求。2019年国家重力数据集汇编（National Gravity Compilation 2019）所包含的航空重力数据（CSCBA 1VD），是2019年澳大利亚国家重力网格B系列完整球面帽布格异常（Bouguer anomaly）网格的一阶垂直导数结果。本次重力勘测依托项目编号202008开展。该网格的单元尺寸为0.00417度（约合435米）。研究人员对原始网格应用快速傅里叶变换（Fast Fourier Transform, FFT）流程，以计算得到一阶垂直导数网格。