Figure 4 Satellite images of the same tract of tropical rain forest in the State of Rondonia in western Brazil, in 1975 and 1992, showing the extent of cutting in this period of seventeen years. The parallel swaths of the fish bone pattern, initially cleared to provide access roads from the connecting thoroughfare, fan out several miles on either side in the later scene. From Historical Landsat Data Comparisons--Illustrations of the Earth's Changing Surface ,U.S. Geological Survey EROS Data Center, pp 16-17, March 1995.