Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
ClevelandM/R-D121.92 m 9.66 km2,115 km
ErieM/R-D121.92 m 9.66 km45 km
Northern Ohio EastM-D548.64 m (barometer)3.22 km7,331 km
Central & Northern Penn.M-Dz304.8 m above ground4.83 km12,714 km