Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
Southwest IllinoisM-Dz914.4 m (barometer)1.60 km11,104 km
Southeast Illinois '77M-D304.8 m above ground1.60 km12,231 km
Bluegrass Area, KY/Pauducah Area, KY/ Hopkinsville Area, KY & TN/ Owensboro Area, KY/ Paradise-Russellville Area, KY & TN/ Louisville, KY/ Burskville-Somerset Area, KY & TN/ Ashland-Hazard Area, KY/ Cincinnatis Area, KYM-D152.4 m above ground1.60 km67,632 km
Cape GirardeauM-D304.8 m above ground1.60 km4,828 km
PaducahM/R-D121.9 m 9.60 km2,566 km