Fig. 3. Percentage of land cover (PLAND) for (A) grassland and (B) cropland for 1985–1989 and 2002–2004, discriminated by pilot area, subunit, and country. Dotted lines indicate the thresholds of relative change in grassland area, calculated as Δrelative = 100(YfinalYinitial)/Yinitial, where Y is the area of the land-use and land cover type. The abbreviations indicate the subunit (letters) and pilot area (Landsat scene; numerals): NOC = Northern Campos, SOC = Southern Campos, SOP = Southern Pampa, FLP = Flooding Pampa, WIP = West Inland Pampa, FIP = Flat Inland Pampa, MEP = Mesopotamic Pampa, ROP = Rolling Pampa, 1 = 222/083, 2 = 223/081, 3 = 224/080, 4 = 224/086, 5 = 225/082, 6 = 225/083, 7 = 227/083, and 8 = 229/084. The number of grid cells included in each combination is given in Table A3.1.