Using Hyper-spectral, Multi-spectral Remote Sensing and Geophysical Data for Detecting Alteration Zones around Wadi Saqia Area, Central Eastern Desert, Egypt

Abstract

In the present study; remote sensing and geophysical radiometric data were used for detecting the alteration zones at the Wadi Saqia area supported by field work and lab spectral analysis. Accordingly, different remote sensing and airborne gamma-ray spectrometry techniques were applied. Maps showing the distribution and potentiality areas of alteration zones in the study area were produced, moreover an enhanced geologic map based on remote sensing data was created. For achieving the objective of the study, different remote sensing data including; multispectral (ASTER), hyperspectral (Hyperion), hyperspectral reflectance measurements (spectral signatures), and Allos PALSAR DEM data were used. In accordance, geophysical airborne gamma-ray spectrometry data were used as well. 5.1. Preprocessing of the satellite data Prior any interpretation or processing techniques be applied to remote sensing satellite data, different preprocessing procedures must be applied to remove the radiometric, atmospheric and geometric conflicts occurred during data capture, reception, storing and archiving.