SPECTRAL MAPPING OF SIWALIK SEDIMENTS OF A PART OF JAMMU FOOTHILLS

The satellite and ground based spectral data corresponding to the six reflected radiance bands of Landsat Thematic Mapper (TM) are analysed to determine their utility in mapping the possible lithologic variatio ns wihtin the Siwalik sediments of J&K foothills. The satellite reflec tance values plotted along a selected image profile identified subunit s within the Lower Siwalik, Parmandal and Nagrota, which were not iden tified by conventional field mapping. The field reflectance studies al so confirmed their presence. The variation may reflect a possible lith ofacies change wihtin the units. The technique developed may provide a rapid reconnaissance tool for preparing lithofacies map.