Mineral Resources
Online Spatial Data
Magnetic anomaly
Aeromagnetic surveys
Illinois
Airborne geophysical surveys
Survey name
Type
Altitude
Spacing
Flight line distance
Aurora
M/R-D
121.9 m
9.60 km
2,666 km
Davenport
M/R-D
121.9 m
9.60 km
2,666 km
Northwest Illinois
M-D
548.6 m (barometer)
4.80 km
2,341 km