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Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
ButteM/R-D121.9 m 4.80 km4,406 km
ChoteauM/R-D121.9 m 9.60 km2,249 km
Great FallsM/R-D121.9 m 4.80 km4,330 km
Boulder BatholithM-Dz3200 m (barometer)3.20 km4,972 km
Townsend ValleyM-Dz152.4 m above ground0.80 km4,063 km
Northwest Montana '65M-Dz2743 m (barometer)3.20 km6,598 km
Northwest Montana '67M-Dz2743 m (barometer)3.20 km4,345 km
MissoulaM-Dz2286 m (barometer)1.60 km6,759 km
Rogers PassM-D2134 m (barometer)1.20 km1,223 km
Butte '83M-D2743 m (barometer)1.60 km11,844 km
Boulder CreekM/EM-D30 m above ground0.20 km1,338 km
West Boulder CreekM/EM-D30 m above ground0.20 km898 km
East Boulder CreekM/EM-D30 m above ground0.20 km302 km
White Sulpher SpringM/R-D121.9 m 4.80 km4,433 km