Ys THE TRANSFORMATIONS OF LAND USE IN AREAS CROSSED BY HIGH 
TENSION POWER LINE BALBINA - MANAUS. A REMOTE SENSING STUDY 
Reiner Olibano Rosas 
Ana Luiza Coelho Netto 
André S. Zaû 
Universidade Federal do Rio de Janeiro - UFRJ 
Departamento de Geografia 
Lab. Ceo-Hidroecologia/Geoheco 
Cidade Universitária - IIha do Fundáo 
21941-590 - Rio de Janeiro, RJ, Brasil 
ISPRS Commission VII / Working Group 3 
ABSTRACT 
The building of huge hydroelectrical power stations in the Amazon region has caused major environmental 
impacts on the forests, especially in the neighbourhood of those power lines for antropie activity starts along 
those maintenance roads opened during the building of the lines. 
The purpose of this contribution is the identification of the transformations which operated in the forest, using 
LANDSAT-TM digital images, gathered in the period of 1984 - 1991, from two different areas cut by a single 
power line which links Balbina hydroelectric power station to the city of Manaus. 
Those digital images were classified by means of a Maximum-likelihood test and the Normalized Difference 
Vegetation Index (NDVI), in order to generate two distinct maps (the 1984 and 1991 maps), showing some 
dynamic modifications. 
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