Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
AuroraM/R-D121.9 m 9.60 km2,666 km
DavenportM/R-D121.9 m 9.60 km2,666 km
East-central IowaM-A304.8 m above ground1.60 km12,070 km
Northwest IllinoisM-D548.6 m (barometer)4.80 km2,341 km