Airborne geophysical survey: Decorah, Iowa

The U.S. Geological Survey contracted Bell Geospace to collect airborne magnetic and gravity gradient data in northeastern Iowa. These data were collected and processed by Bell Geospace using industry standard techniques. These data are being provided to the general public as the were delivered by Bell Geospace. A full description of these data is provided by the contractor's report (Decorah_Air-FTG_Report.pdf).

美国地质调查局（U.S. Geological Survey）委托贝尔地质空间公司（Bell Geospace）在艾奥瓦州东北部区域采集航空磁测与重力梯度数据。该数据集由贝尔地质空间公司采用行业标准技术完成采集与处理工作。本次公开提供的这批数据完全保留其由贝尔地质空间公司交付时的原始状态。该数据集的完整说明详见承包商提交的报告（Decorah_Air-FTG_Report.pdf）。