Airborne geophysical surveys

Survey name Type Altitude Spacing Flight line distance
Johnson CityM/R-D121.9 m 4.80 km5,122 km
Winston-SalemM-Dz609.6 m (barometer)1.60 km8,207 km
Johnson City 2003M-D304.8 m above ground1.00 km3,170 km
Southwest VirginiaM-Dz1524 m (barometer)2.40 km4,828 km
Winston SalemM/R-D121.9 m 4.80 km5,122 km