Recovering Old Geophysical Projects: The Case Of The Uraricoera Project

Great improvement was achieved in reprocessing aerial geophysical data for a portion of the Amazon region.<br>Problems with IGRF removal and gamma spectrometric corrections were identified and corrected by the use of<br>simple computer programs. A procedure for atmospheric correction is proposed, based on the measured data,<br>involving non linear regression among counts and flight height. Multivariate classification of the recovered data,<br>supported by remote sensing imagery analysis, improved substantially the available geologic map for the NW<br>portion of Roraima State and neighboring portions of Amazonas State and Venezuela.