Survey Size: 2,400 square miles; 1,600 stations Data Spacing: ½ mile intervals on lines 3 miles apart, acquired using helicopter-supported inertial surveying Terrain Corrections: Through Hayford-Bowie Zone J Data Provided: Bouguer Gravity Map (scale 1:96,000): Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network. Magnetic tape and computer printout containing
Survey Size: 5,200 square miles, 250 stations Data Spacing: Variable, acquired using helicopter-supported inertial surveying Terrain Corrections: Through Hayford-Bowie Zone J Data Provided: Maps (scale 1:250,000): Bouguer Gravity Map. Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network. Magnetic tape and computer printout containing all principal survey facts including: station
Survey Size: Approximately 7,000 square miles; 1,609 helicopter stations from EDCON’s Bristol Bay Survey, 908 stations from the USGS gravity data base, 3,013 helicopter stations from the Strata Search survey. Data Spacing: Variable Terrain Corrections: Through Hayford-Bowie Zone J Project Summary: USGS stations have been terrain-corrected and integrated with the EDCON and Strata Search data.
Survey Size: 13,100 miles Flight Lines: North-South, 1 kilometer spacing Tie Lines: East-West, 2 kilometer spacing Elevation: 500 feet above ground level Instrumentation: High-sensitivity Cesium vapor magnetometer Data Provided: Total Magnetic Intensity (IRGF removed) contour map Flight Path Map Reduced-To-Pole of TMI map Vertical Derivative map (optional) Horizontal Gradient (optional) Profiles, on paper (optional) CD/DVD
Survey Size: 45,500 miles Flight Lines: East-West, ½-mile 1-mile, and 2,250 feet spacing Tie Lines: North-South, 5-mile spacing Elevation: 4,700 feet barometric, draped over higher elevations Instrumentation: Geometrics G-813 magnetometer, 0.05 gamma sensitivity Date Flown: December, 1985, to April, 1986 Data Provided: Total Magnetic Intensity (IRGF removed) contour map Flight Path Map Reduced-To-Pole of TMI
