Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
BellevilleM/R-D121.9 m 9.60 km2,761 km
Wabash ValleyM-D152.4 m above ground0.48 km6,115 km
Southeast Illinois '77M-D304.8 m above ground1.60 km12,231 km
PaducahM/R-D121.9 m 9.60 km2,566 km
VincennesM/R-D121.9 m 9.60 km2,761 km