Mineral Resources
Online Spatial Data
Magnetic anomaly
Aeromagnetic surveys
Illinois
Airborne geophysical surveys
Survey name
Type
Altitude
Spacing
Flight line distance
Southwest Illinois
M-Dz
914.4 m (barometer)
1.60 km
11,104 km
Cape Girardeau
M-D
304.8 m above ground
1.60 km
4,828 km
Paducah
M/R-D
121.9 m
9.60 km
2,566 km