Airborne magnetic survey over northeast North Dakota, 2000-2001

This data release is a re-release of an airborne geophysical survey carried out for the United States Geological Survey (USGS) by Spectra Exploration Geoscience Corp., from November 2000 to February 2001. The purpose of this survey was to acquire high-resolution, high-sensitivity aeromagnetic data over an area in northeast and north-central North Dakota and assess the area for anomalies and magnetic features pertaining to the local geology. To achieve this purpose, the survey area was systematically traversed by an aircraft carrying geophysical instruments along parallel flight lines (traverses) spaced 0.25 miles (400 meters) apart in an east-west alignment. Tie lines were flown normal to the traverses spaced at 5 miles (8000 meters). [...]本数据集为Spectra勘探地球科学公司（Spectra Exploration Geoscience Corp.）为美国地质调查局（United States Geological Survey，简称USGS）于2000年11月至2001年2月实施的航空地球物理调查的重新发布版本。本次调查的核心目标为在北达科他州东北部及中北部区域获取高分辨率、高灵敏度的航空磁测数据，并针对该区域内与当地地质相关的磁异常与磁性特征开展评估。为达成该目标，搭载地球物理仪器的航空器沿东西向排布的平行飞行航线（主测线）对调查区域进行系统勘测，主测线间距设置为0.25英里（400米）；同时布设垂直于主测线的连接测线，其间距为5英里（8000米），并完成该类测线的飞行作业。[...]