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| Aeromagnetic data merging based on magnetic data leveling:A case study of the Qihe-Yucheng area, Shandong Province |
WU Cheng-Ping1( ), YANG Xue1, YU Chang-Chun1, XIONG Sheng-Qing1, FAN Zheng-Guo1, SU Yong-Jun2, HAO Xing-Zhong3 |
1. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China
2. Tianjin Center, China Geological Survey, Tianjin 300170, China
3. Shandong Institute of Geological Survey, Jinan 250104, China |
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Abstract High-precision aeromagnetic surveys have been carried out in the Qihe-Yucheng area, Shandong Province in different years. To effectively reuse the existent survey data, it is necessary to merge them to form large-scale high-precision aeromagnetic data. This study processed the aeromagnetic data acquired in 2011 and 2017 through correction, continuation, and combination. Then, these data were merged using methods including tie-line leveling, weak magnetic data leveling, and micro-leveling. As a result, 1:25,000 high-precision aeromagnetic data were obtained, with a survey grid spacing of 250±16.2 m and total precision of 1.3 nT. The new data had higher resolution and contain richer geophysical information. This study fills the gap of 1:25,000 aeromagnetic data of the study area and provides important basic data for subsequent data processing and interpretation of the study area.
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Received: 13 July 2022
Published: 11 October 2023
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Aeromagnetic total field in Qihe-Yucheng area of Shandong Province (after leveling)
a—aeromagnetic total filed acquired in 2011;b—aeromagnetic total filed acquired in 2017
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Aeromagnetic survey grid in Qihe-Yucheng area of Shandong Province
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Aeromagnetic field map after normal field reduction and diurnal correction (without leveling)
a—aeromagnetic total field in 2011; b—aeromagnetic total field in 2017
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Data merging with leveling methods
a—magnetic field after upward continuation and zero level altering; b—tie line leveling; c—leveling for the weak magnetic field; d—microleveling
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Distribution of flight line spacing
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Contrastive analysis of the data before and after merging
a—the areas for contrastive analysis,the base map is the survey grid (without tie-lines); b—aeromagnetic total field before data merging in area Ⅰ; c—aeromagnetic total field ΔT after data merging in area Ⅰ; d—total gradient magnitude of aeromagnetic field ΔT before data merging in area Ⅱ; e—total gradient magnitude of aeromagnetic filed after data merging in area Ⅱ
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