Spectral properties and reflectance curves of the revealed volcanic rocks in Syria using radiometric measurements

Abstract

This research aimed at studying the spectral reflectance intensity of different exposed volcanic rocks in Syria, and drawing their curves by radiometer measurements. In order to reach this goal, we have studied different kinds of volcanic rocks related to different ages, from the Jurassic until the recent Quaternary, and composed of fresh and altered basalt, phonolite and volcanic tuff. † Deceased. We measured the reflected rays of the volcanic rocks by using radiometers equipped with filters for the multi‐spectral scanners (TM, MSS and SPOT), and the recorded information was treated according to the equation Furthermore, through this equation we made a calculation for the reflectance intensity of each kind of measured rocks with different channels. We then showed the results of our measurements graphically. After that, we represented the average of the reflectance intensity curves for the various kinds of rocks, and for each kind of the mentioned scanners. We also determined the relative values of reflection in the different spectral channels to cancel the effect of the shadow, and to obtain the best information to help in designing and developing remote sensing survey equipment to recognize the mentioned rocks accurately.