1. a Anthropological Center for Training and Research on Global Environmental Change (ACT), Indiana University , Bloomington , IN , 47405 , USA
2. b Brazilian Agricultural Research Corporation, EMBRAPA Satellite Monitoring , Campinas , São Paulo , Brazil
3. c Instituto Nacional de Pesquisas Espaciais (INPE), Divisao de Processamento de Imagens (DPI) , Sao Jose dos Campos , Brazil