@Article{AlmeidaFoShim:2000:DeArDi,
               author = "Almeida Filho, Raimundo and Shimabukuro, Yosio Edemir",
                title = "Detecting areas disturbed by gold mining activities through JERS-1 
                         SAR images, Roraima State, Brazilian Amazon",
              journal = "International Journal of Remote Sensing",
                 year = "2000",
               volume = "21",
               number = "17",
                pages = "3357--3362",
                month = "Nov.",
             keywords = "detection method, JERS-1, mining, physical disturbance, synthetic 
                         aperture radar, Brazil.",
             abstract = "Three JERS-1 SAR images (1993, 1994, 1996)were evaluated for 
                         detection of areas disturbed by gold mining activities in the 
                         region of Serra Tepequem, Roraima State, Brazilian Amazon. Subtle 
                         tonal contrast between eroded areas and savannah grass fields in 
                         the Tepequ6m plateau, constitutes a serious constraint on the 
                         identification of the disturbed areas, using SAR original images. 
                         However, normalized difference index (NDI)images allowed 
                         identification of cover changes related to mining activities. NDI 
                         images indicated increase in areas disturbed from 1993 to 1994 and 
                         from 1993 to 1996. The 1994-1996 NDI image did not show 
                         significant changes, indicating that most areas were disturbed 
                         prior to 1994. Results showed that processed JERS-1 SAR images may 
                         be used to detect land cover changes even in non-forested terrain 
                         with low spectral contrast among scene components.",
           copyholder = "SID/SCD",
                 issn = "0143-1161",
                label = "758",
             language = "en",
           targetfile = "Almeida.pdf",
        urlaccessdate = "02 maio 2024"
}