the 500 feet specified by the FAA for conventional fixed-wing aircraft More data. Because of low cost, surveys can be flown with tighter line spacing The basic geophysical system...Ultralight Aeromagnetic... ULTRAHIGH-DEFINITION AEROMAGNETIC SURVEYS PRJ is now offering ultrahigh-definition aeromagnetic surveys using an ultralight aircraft. The system... includes differential GPS navigation and positioning and radar altimeter. Acquisition airspeed is 45 to 60 mph. Subject to topographic conditions, surveys may be flown as low as 50 meters...

plotting for rapid assessment. To illustrate, we show the results obtained from an aeromagnetic survey of part of the Green River Basin in Wyoming. The data were acquired... shows the reduced to pole anomalous total magnetic intensity for the survey; Figure 2 shows the horizontal gradient of the reduced to pole anomalous total magnetic intensity. Figure... 1. Reduced to pole anomalous total magnetic intensity from the aeromagnetic survey. Contour interval 20 nT. Figure 2. Horizontal gradient of the reduced to pole anomalous magnetic...

history in geophysics. Early attempts were limited by the capacity of the computers of the time; in the early 1970's sufficient computer capacity became available to allow a serious... search for techniques that were in some sense optimal. This resulted in the near-universal adoption of minimum-curvature gridding of potential fields in exploration geophysics. Minimum... and elevation. In particular, a survey can be brought to either a perfect constant barometric elevation or to a perfect drape. This completely eliminates line anomalies...

for immediate purchase. The aeromagnetic data consist of two modern digital surveys flown in 1991 and 1988-89 and two analog surveys flown in 1967-68 and 1962-63. The 1991 survey was flown... by BGM Airborne Surveys, Inc. for the Servicio Geologico de Bolivia (GEOBOL) and the Bolivian Ministry of Mines. Aero Service Corporation flew the 1988-1989 aeromagnetic survey... for the Yacimientos Petroliferos Fiscales Bolivianos (YPFB). Prakla of Hannover, Germany, flew the 1967-1968 survey, also for the YPFB. The 1962-1963 survey was flown by Swedish...

released from the U.S. Geological Survey, and PRJ is editing and merging all of the grids to generate a total magnetic intensity map. EDCON-PRJ's proprietary processing technique... is then being applied to generate a low-latitude reduction-to-pole map without distortions. The aeromagnetic data consist of four surveys: One flown in 1991 covering approximately... 25,106 line-kilometers (15,601 line-miles) in the Altiplano, Cordillera Occidental and Cordillera Oriental regions of southwestern Bolivia; another survey flown in 1988-1989 covering...