Mineral Resources
Online Spatial Data
Magnetic anomaly
Aeromagnetic surveys
South Dakota
Airborne geophysical surveys
Survey name
Type
Altitude
Spacing
Flight line distance
Martin
M/R-D
121.9 m
9.60 km
2,433 km
S. South Dakota
M-Dz
1311 m (barometer)
1.60 km
28,689 km
Valentine
M/R-D
121.9 m
9.60 km
2,637 km