Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
Northwestern surveysM-D150 m above ground0.40 km44,500 km
North-central surveysM-D91 m above ground0.38 km60,000 km
NE North DakotaM-D152.4 m above ground0.40 km29,265 km
RoseauM/R-D121.9 m 9.60 km1,889 km
Thief River FallsM/R-D121.9 m 9.60 km2,277 km