Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
Hot SpringsM/R-D121.9 m 4.80 km4,710 km
New CastleM/R-D121.9 m 4.80 km4,763 km
South Black HillsM-A152.4 m above ground0.40 km2,574 km
Black HillsM-A2286 m (barometer)1.60 km1,971 km
S.W. S. Dakota-E. WyomingM-D152.4 m above ground1.00 km10,581 km
S. South DakotaM-Dz1311 m (barometer)1.60 km28,689 km