Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
AshlandM/R-D121.9 m 4.80 km3,162 km
DuluthM/R-D121.9 m 9.60 km2,259 km
PineM-A304.8 m above ground1.60 km692 km
Northeastern surveysM-D150 m above ground0.40 km100,000 km
Northwest WisconsinM-D91 m above ground0.80 km6,316 km
West Wisconsin '96M-D152.4 m above ground0.80 km6,759 km