NEW APPLICATION OF SATELLITE REMOTE SENSING IMAGES -APPLICATION OF LIGHT-ENERGY SPECTRUM INTEGRATED IMAGES TO URANIUM RESOURCE EXPLORATION

摘要

There are two evident disadvantages in multispectral satellite remote sensing image application in geology exploration at present: (1) Poor effect on discriminating lithology in vegetation areas. (2) Except for outcrop areas, it can not be directly used to prospect deposits the only way for finding deposit is indirectly analysing metallogenetic environment. The "above-mentioned disadvantages seriously affect its applied range and depth. In order to make up for these weaknesses, a new method which combines light spectrum with energy spectrum is introduced. The purpose is to improve the applied effect of satellite remote sensing data. According to the prospecting uranium experience in the past years, airborne gamma-ray data can yield good resluts in discriminating lithological nature and distinguishing alteration and uranium mineralzation, even in vegetation areas. Utilizing the digital image processing system and geographic information system, the satillite remote sensing data can be integrated with airborne gamma-ray data to produce a new type of images. The new image has merits of both remote sensing image and gamma-ray spectral image. The former shows plentiful topographic information, strong three-dimensional effect. It is convenient for us to determine localities and solve the structure problem. The latter is useful for discriminating lithology, alteration and uranium mineralization. The study of the new image in the test area has brought about remarkable effects, not only in proping geology mapping, but also in determining metallotectonic and selecting prospecting targets. The new method, therefore, has played more effective role in the uranium resource exploration.