Survey Size: Approximately 14,358 line miles Flight Lines: Northeast-Southwest, ⅛-mile Tie Lines: ½-mile, northwest-southeast Elevation: Approximately 500 feet, draped Date Flown: 12/17/94 to 8/20/95 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 with Flight Line
Survey Size: 35,843 miles Flight Lines: East-West, ½-mile spacing, except, 2-mile spacing in western part of Webb, northeastern part of Duval, and northern part of Jim Wells Counties Tie Lines: a) North-South, 1½-mile spacing in western portion including all or portions of Webb, Zapata, Starr, Jim Hogg, and Duvall Counties b) North-South, 5-mile spacing in
A detailed aeromagnetic survey of the Republic and Toroda Creek grabens was flown by Hunting Geophysical Services, Inc. in 1959. Five 15-minute quadrangles were surveyed. (See location map overleaf.) The data were published by the Washington Division of Mines and Geology in 1960. The publication is now out of print. EDCON-PRJ has digitized the maps
Survey Size: 1,800 line miles (2,897 line km) Flight Lines: East-West, 1-mile (1.6 km) spacing Tie Lines: North-South, 1-mile (1.6 km) spacing Elevation: 500 ft. (152 m) above mean terrain Instrumentation: Geometrics G-813 magnetometer Date Flown: 1993 Data Provided: Total Magnetic Intensity (IRGF removed) contour map Flight Path Map Reduced-To-Pole of TMI map Vertical Derivative
Survey Size: 24,400 line miles (39,268 line km) Flight Lines: East-West, ½-mile to 7,000 feet spacing (0.8 to 2.1 km) Tie Lines: North-South, 10-mile spacing (16 km) Elevation: 2,500 feet barometric (762 m) Date Flown: May to August, 1982 Data Provided: Total Magnetic Intensity (IRGF removed) contour map Flight Path Map Reduced-To-Pole of TMI map
