Accession Number : ADP002065

Title :   Multitemporal and Geobotanical Approach in the Remote Detection of Greisenization Areas in the Serra Da Pedra Branca Granite, Goias State, Brazil,

Corporate Author : INSTITUTO DE PESQUISAS ESPACIAIS SAO JOSE DOS CAMPOS (BRAZIL)

Personal Author(s) : Almeida Filho,R.

Report Date : JUN 1982

Pagination or Media Count : 8

Abstract : A multitemporal (multiseasonal) analysis of LANDSAT multispectral images in CCT format permitted the mapping of lithologic facies in the Pedra Branca Granite, using geobotanical associations, which occur in the form of variations in the density of the 'cerrado' vegetation, as well as the predominance of certain distinct vegetation species. Dry season images did not show very good results in lithological differentiation due to anomalous illumination conditions related to the low solar elevation and the homogeneity in the vegetation cover, specially the grass that becomes dry during this season. Rainy season images, on the other hand, allowed the separation of the lithological types, a fact that can be attributed to a greater differentiation among the geobotanical associations. As a result of this study, the muscovite-granite facies with greisenization zones within the Serra da Pedra Branca were mapped. This methodology can be successfully applied to similar known granite bodies elsewhere in the Tin Province of Goias.

Descriptors :   *Remote systems, *Geobotanical mapping, Brazil, Geology, Vegetation, Data acquisition, Remote detectors, Image processing

Distribution Statement : APPROVED FOR PUBLIC RELEASE