Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
Washington-Idaho-MontanaM-Dz2134 m (barometer)3.20 km8,441 km
Spokane 2013M-D200 m above ground0.40 km12,105 km
SandpointM/R-D121.9 m 1.60 km9,994 km
SpokaneM/R-D121.9 m 1.60 km6,187 km
Northeast Washington '73M-D2134 m (barometer)1.60 km8,143 km