Acknowledgments
The authors thank the PPG7—‘Programa de Pesquisa Dirigida’ (MMA/MCT/FINEP) for the financial support to the Instituto do Homem e Meio Ambiente da Amazônia—Imazon—for acquiring the SPOT 4 and Landsat TM images. The acquisition of the IKONOS images was funded through the TREES II Project (European Community Joint Research Center). The work of Carlos Souza Jr was funded by NASA/LBA through Dr Dar Roberts. Finally, we are very thankful to Rodney Salomão and Anderson Costa for assistance with the interpretation of the Ikonos image, and Edson Vidal for providing the field data.